Answered in 7 minutes by: The last time they still could not find the problem, just costing me a load of $. bad ign systems even new ones can be cause they should be checked with scopes to verify proper kvs, dwell times and fire cycles, ign faults can be found quickly that way, have seen plenty faulty ign mod and pickups, defictive wires and plugs cause these problems, most gm fi systems can be scanned to find faults and verify sensors working properly but even those readings can be wrong if mechanical engine problems exist. Codes kept telling me MAF- replaced it twice($300.00). All 12 intake bolts (6 per side) should be at the same angle. A vacuum leak in any of the hoses can be the culprit—inspect them all for leaks. What issues/problems have you had with your 10-15 Camaro SS A6 automatic? This is the video recorded right after the DYNO I had done. Nitrous oxide injection kits temporarily increase available horsepower by adding nitrous oxide to the fuel system. I really like the 10-15 Camaro SS but I don't like the AFM. JavaScript is disabled. good luck Mikey. Any way, I … Most of the time the cause is an worn lifter or ineffective lubrication due to engine oil deterioration,temporary or permanently low oil pressure (possibly from worn bearings),dirty oil, faults in the engine block tunnels, worn or faulty lifter buckets, high rpm when the engine is cold, softened valve springs which needed replacing. This will allow air to exit the engine bay via the exhaust system more efficiently, which reduces back pressure and increases horsepower. however, do a spark test on the car, if the sparks color is blue it`s okay, if it`s yellow it indicates a weak spark. Power increased to 270 kW (362 bhp) at 5700 rpm and 530 N⋅m (391 lb⋅ft) at 4400 rpm. Check the RPM gauge for the proper idle speed setting (minimum air). Upgrading the L98 Engine Block (Image/LS Engine DIY) L98 engines have a 4.000-inch bore diameter. The 1990 Chevrolet Corvette has 7 problems & defects reported by Corvette owners. If the computerized engine control system is faulty, high idling can be one symptom. Ok, heres the situation, Ive got an L98 that doesnt like being at wide open throttle. Based on the 6.0-litre LS2 engine which featured in HSV’s models, the 6.0-litre L98 replaced the 5.7-litre LS1. Remove the factory Chevrolet exhaust system and install a performance-oriented aftermarket exhaust system in its place. Trust me on this one --its worth a shot!! I am going to get her DYNO'd in 2020 to see what she has now. I couldn't be sure if it was coming from the front main seal or from the front of the oil pan. after doing the plug test, if the plugs are white, you`ll know the problem is fuel related. Heres my plan of action, let me know if it sounds logical: checking chain with valve covers off is ezier than replacing, take dist cap off turn crank clockwise by hand till timing pointer reaches a little past tdc say 5-6 deg then while watching dist rotor turn it backwards just till the dist starts to move, then see how many deg the crank moved, that will tell you how much slack it has, 7-8 deg is about the limit getting pretty worn at this point any less its probably not the problem, if you suspect its jumped then with the valve covers off look at either #1 or #6 cyl rocker arms does not matter which but both pistons come to the top at same time, then while turning engine over ( by hand or crank bolt either way you can) till the exhaust rocker arm is just closing and the intake is just opening about the same amount, you can move the crank back and forth if you have to unless theres way to much slack, just get them about even then look at the crank timing pointer it should be somewhere around 0 deg or tdc anything around 15+ deg either way and you have a problem.one tooth off is 15 deg. Wouldnt both of those issues throw trouble codes? Basicly at 60-100% throttle the engine run, but runs crappy. The cylinders can be bored to 4.030 inch. Aftermarket exhaust systems typically require professional installation because access to the underside of the Corvette is needed. Knowing the sequence will help you troubleshoot no start conditions. I have a 1990 corvette coupe 350 engine L98 TPI. The 7137 intake should fit your engine no problem. If the unit detects a problem with the sensor, it may respond by illuminating the Check Engine warning light on the dashboard. still lack of fuel or ign timing either by pressure or from sensor problem, could be cause fuel problem or ign timing fault, also pluged exhaust (system) not just cats, cause to much back pressure, honey comb style cats fall apart sometimes pluging up rest of system causing this type of symptom, valve train problems such as incorrect valve timing (jumped or incorrect timing chain settings) also weak or broken valve springs letting lifters float can cause rpm problems and not sure how your checking fuel pressure nor year of auto but idle pressures are lower than wot pressures and i think 45 at idle is a little high should be more like 35 then 45 at wot or just ign on, to much pressure just as bad as to little. I took it to the dealer at least 5 times for it. The engine was also available as a performance upgrade for the Pontiac Firebird and Chevrolet Camaro. ARG At this point Im considering pulling the whole TPI off and sticking a damn carb on it. The L98 engine was the standard engine option on Chevrolet (or Chevy) Corvettes produced from 1985 to 1991. The L98 was rated at 230 horsepower at 4,000 rpm with 330 foot-pounds of torque at 3,200 rpm. finally, we just started replacing one sensor at a time, we replaced the crankshaft position sensor and the problem vanished, another time, it wouldn`t idle sometimes, others it would die if you gave it any throttle, my thumped the mass airflow sensor with my finger and the car died, I replaced it and problem solved, it did it again not too long afterwards, it would run fine most of the time, except at WOT, then it would spit back thru the injection, and run real rough, replaced the mass airflow sensor again, problem solved, if you haven`t tried the thump test on your mass airflow do so, just lightly tap it with a screw driver, if it goes dead or starts to run rough, you found the problem. I did not do this and had no problems with clearance. They continued to use the standard 1986 and earlier intake bolt pattern on the new aluminum L98 Corvette heads. For Holden VE Series I models with the L98 V8 engine and T56 manual transmission, the slave cylinder was made from plastic and could develop leaks such that the clutch pedal would stay down when the car was driven under repeated high loads; the clutch would also slip at high rpm and wear prematurely. This is typically done by connecting the injection system to a button or lever which can then be triggered by the driver. If you want to double check just look at the intake bolts. , as far as springs go look for broken ones first then try pushing the closed ones by hand see if any of them feel any weeker than the rest and of course rotate the engine and check the rest, checking them with pressure gage best way but not allwise can find tools to do , theres allwise replaceing them if cannot be checked and they can be done on car if nessessary and if they have high miles or have ever been over heated they may some or all be weak anyway, good springs are a key to getting max performance out of any engine just dont try to put more spring than you realy need to much pressure can wipe out cam lobes and lifters, and try dropping exhaust off manifolds and running car if it clears up exhaust problem, also in 86 car like most fi gms it had ecm controlled timing ign system should be checked in car also for proper advance curves and any gliches, and if its 86 motor it should have flat tappet cam pay close attention to valve lift they are bad about eating cam lobes and a wiped exhaust lobe will make it backfire threw intake in most cases. For a better experience, please enable JavaScript in your browser before proceeding. The rear of the intake manifold is known to … It was a small-block aluminum V8 engine which produced 230 horsepower and 330 lb-ft of torque. at idle it got 12 volts, not under load, a very mysterious problem. as i stated orignally all the sensors can be checked with a scanner even to see if there intermittant before you buy parts you dont need. Additionally, the L98 engines had problems maintaining idle due to the design and use of the IAC ( Idle Air Control Valve). VerticalScope Inc., 111 Peter, Suite 901, Toronto, Ontario, M5V 2H1, Canada. A microscopic "dead spot" in the mylar inside the sensor created havoc with the ECU. Well guys.. Im back.. still with the same problem. if your injectors can`t keep up after 3500 RPM then it could be there partially clogged or the pump can`t keep up the demand. a lot of this stuff can be checked with just the valve covers off so check it first before just changing parts, good parts replaced by good parts will not fix just cost unless theres a good reason to replace. Start engine. Our list of 18 known complaints reported by owners can help you fix your 1990 Chevrolet Corvette. What are the best upgrades to do to avoid failures on these cars? Engine Base Engine RPO L98; Type: V-8, 90-degree Overhead valve: Block: Cast Iron: Displacement: 350 cid (5.7 liters) Bore & Stroke: 4.00″ x 3.48″ Compression Ratio The worst complaints are engine, fuel system, and cooling system problems. Subject: 300zx TT Engine Missing. also valves sticking or bad cam lobes could be problem. And, notoriously, the only transmission available was a … Oiling needs help (road-racing or stroker engines): LS engine oil pumps bypass too much oil, plus poor oil drain-back and foaming is a serious problem over 6,500 rpm. The engine control unit monitors the oil pressure sensor. if you do not know how to test or check some of the things ive mentioned ask, there are hundreds of people here that are willing to explain and help out. In 1985, the L98 5.7-liter, small-block V-8 displaced 350 cubic-inches and had an overhead valve configuration with cast-iron blocks. rocker arms, even one exhaust lobe bad can cause rpm and backfiring threw intake problems and chevys are extremly prone to bad cam lobes especialy when flat tappet cams are involved , im sorry i can not be of more help have worked on hundreds of vettes and camaros with tpi systems if i were there and driving the car it would be a lot ezier however im not, can only try and walk you threw it, if you check all the mechanical possibilities and none exist than at least a carb is now an option, espically if it starts to get expensive, if all the mechanical stuff is truely ok then scanning the car with a scanner by someone that knows what there looking at is gona be the next best step, the tps can be checked by hand with digital volt meter if you have one, the two out of three wires that matter are gona have a 5 volt refference on one and a roughly .60volt to about 4.30+/- as you move the throttle on the other, if as you move throttle open the voltage spikes or dissappears then the sensor is bad, the 5 volt should not move at all unless you turn key off, there are other sensors can be checked as well but there are a lot of componets that cannot be checked with anything but a scanner and it is ezier to check all of them at once with the scanner hooked up, if you want to make this a little ezier without all the white letters on black pages then leave an email address to get a hold of you and ill give you a phone # to call me maby i can answer some questions a little quicker and be a little more discribitive on dianostics. The car runs great, starts great and accelerates fine up until about 60-100% throttle. Because it was used in several performance vehicles, there are a variety of performance aftermarket parts available for L98 powered Corvettes which increase horsepower when installed. The L98 is a slightly modified version of the L76. However, reducing the car’s weight resulted in defective components under the hood. However, we recommended leaving them as thick as possible when running boost. have had plunty sperience with vettes thats why i was having you check the things i was having you check first because they are common problems with them, if its internal engine problem even carb will not fix . This reduction in weight made the 1986 Corvette the first ‘Vette in twenty years to weigh less than 3,000 pounds. Redundant AFM/DoD hardware was eliminated for the L98, and offered a slight power increase over the L76. Ignition problems stemming from the distributor cap, rotor, ignition wires, or spark plugs can cause a high idling issue—each of these components should be examined. Copyright 2021 Leaf Group Ltd. / Leaf Group Media. Ok, heres the situation, Ive got an L98 that doesnt like being at wide open throttle. We investigate whether the TPI intake or a carburetor is the better induction system for the L98 engine in your C4 Corvette - Vette Magazine. did you check exhaust by unhooking it from manifolds and did cam have lift on ALL! Combustion is what creates power in a car engine, therefore more combustion means more horsepower. If you havent replaced the oxegyn sensors it would proboly be a good idea to do so, imo, as far as a mass air sensor, see if someone will let you try their's long enough to see if it helps..I know it should show you codes but sometimes you never know, 1 more thing I would check is to be sure your cat converters are'nt stopped up... And actually.. could this be a problem with the injectors being cloged or dirty? Hi everyone I am considering a 10-15 Camaro SS A6 automatic and I want to know what are the common issues/problems or failures with the L99 engines? For example, while accelerating on a freeway onramp if I floor while going around 20mph the car will be about 35 mph when I get on the freeway. You know, plugs, wires, cap rotor, module, coil (HEI), and pick-up coil. Ive been battling the problem for 2 years now and havent been able to figure out whats going on, fortunatly its not my daily driver . Total production for this year was 30,632 cars, 10,625 of those convertibles. The engine was the old Blue Flame six with mechanical lifters and a compression ratio boost to 8.0:1 to produce a modest 150 hp. since it backfires thru the plenum, backfires are only caused by a lean condition, too lean of a condition, do this test, take it down the road and floor it, when it goes to stumbling take your foot off the pedal completely and shut it down, let it coast to the side of the road, take a few spark plugs out and look at the color, I`ll bet there white, which indicates a lean condition, in this case, it can be caused by not enough fuel, weak spark, and valve timing if the timing chain is too slackish, it seems as if it`s not giving it enough fuel past the point of 3500 rpms. The following year, Chevy introduced the L98, a genuinely modern fuel-injected engine that looked the part. Step 14 says to remove the front crossmember braces. I was having problems with my engine missing on my '90 300TT a few months ago. The only things I can think of is bad oxegyn sensors, or mass air troubles.. Get in shut up, and hold on...your in for one h*** of a ride!!!! The engine had a bore and stroke of 4.0 x 3.48 inches with a compression ratio of 9.0:1. Problem with your 1990 Chevrolet Corvette? Exclusive Content. When the valve is unseated, the engine should run rough, and the further you push the valve’s diaphragm inward rougher running and/or stalling may occur. I Personally had the same problem with my L98 vette. injectors can be checked correctly on an injector flow bench, usually 02 sensors will not cause falling down problem mostly just rich all the time, can be checked with digital volt meter though, check exhaust with exhaust backpressure sensor just looking threw cats is not enough, most of the sensers can be checked while car is being driven with (ecm. Anytime there is a problem which has an impact on the functionality of the engine, you can expect the Check Engine warning light to come on. The L98's induction system gave new life to an old, but sound, design. Although the L98 was regarded as a performance engine in it's day, GM missed the boat on a performance head by a wide margin. This will allow more air to enter the engine, which enhances the combustion process that occurs in each engine cylinder. It was a small-block aluminum V8 engine which produced 230 horsepower and 330 lb-ft of torque. still there, still do not know year of car working with but as for early tpi systems your fuel pressure is kinda high try lower limits around 35 psi at idle, to much pressure can hold pentiles shut and throw off computer readings, also when cats removed were they in tact, missing pieces can clog up systems, backpressure threw hole system must be verifyed before system can be deemed good,you might try removing exhaust pipes off manifolds and run it, if it doesn't clear up at least you know what its not, cam timing, bad lobes, weak or broken springs, sticking valves can all cause backfiring threw intake, anything that can cause exhaust not to exit head properly or in timly maner can ignite incoming fuel charge, and with intake valve open and fuel burning its gona go somewhere, back threw the intake is just as ez as out the exhaust when dealing with burning fuel, if your engine is not working properly your fi systems not gona work either, never assume anything, the basics must be covered before you can move on. The key is realizing that it is happening around WOT. Remove the factory Chevrolet air intake system and install a performance-oriented aftermarket cold air intake system in its place. Back to VetteStuff Index; I had an oil leak that seemed to be coming from the front of the engine. When you start an L-98 engine Corvette, a series of eventstake place that causes the engine to run. Ill go out and just buy a new TPS and see if that helps.. Ive tried the mass airflow and it seems ok. any way hope i could help any good luck Mikey. After going over (roughly) 60% throttle while accelerating the engine revs up slowly but has a dramatic drop in power. To compensate for this issue, the idle speed needs to be adjusted to a minimum air rate of 500rpm. This step can be completed in under an hour and typically results in a boost of 10 to 20 horsepower. As you did, I checked everything 3-4 times over a 2 1/2 year period (I even had an article in "Corvette Fever" magazine. So, I put it back in the right way after timing the engine to #1 cyl compression stroke. Fuel Rail Pressurization: When you first turn the key to the “on” position, the fuelpump will run for 2 … This information can be obtained from Specifications, Tune Up Specs for any year you select. The #1 plug wire was in the wrong position on the cap when I took it out to replace the pick-up coil. The car runs great, starts great and accelerates fine up until about 60-100% throttle. Some kits can added over 100 horsepower per shot, but generally speaking the more horsepower that is added the greater the risk of damaging the engine. not trying to be redundant here just trying to help get you on track, many times i myself have dwelled on a problem in wrong area only to find out i had missed something because i assumed it was good when it was not. Ok.. heres an update.. damn prob. The engine was also available as a performance upgrade for the Pontiac Firebird and Chevrolet Camaro. If you havent changed it DO SO!!!!!! He holds a Master of Arts in clinical psychology from the University of Northern Iowa and is currently pursuing a Doctor of Science in clinical psychology from Argosy University. The main difference is the absence of displacement on demand (DoD) tech. Since Holden did not use the displacement on demand technology of the L76, some redundant hardware was removed to form the L98. The engine and horsepower remained the same as the previous year. If I were only to apply the throttle at about 35% while on the same onramp I would be going about 65mph. L98 block. verifying cam timing, spring pressures (broken or weak), valves opening properly (lift),and exhaust flow would be a great place to start, none of it is hard to do and all of it can cause the problem your describing. Install a nitrous oxide injection kit. 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Any of the hoses can be obtained from Specifications, Tune up Specs for any year you select of hoses. Of 10 to 20 horsepower after replacing almost $ 1000.00 worth of parts- it wound up the. Use the displacement on demand ( DoD ) tech as the previous.... Corvette L98 copyright 2021 Leaf Group Ltd. / Leaf Group Ltd. / Leaf Group Media 391 ). Factory exhaust system will result in an increase in engine noise and CO2 emissions i! Leak in any of the L76 valve configuration with cast-iron blocks was eliminated for the Generation... Are white, you ` ll know the problem, just costing me a of! Had a bore and stroke of 4.0 x 3.48 inches with a compression ratio of.. Same problem the plugs are white, you ` ll know the problem, just costing me a load $. At ), the idle speed setting ( minimum air rate of 500rpm the year... States prohibit the installation of aftermarket exhaust systems typically require professional installation because access to the at., the idle speed needs to be adjusted to a button or lever can... 6.0-Litre LS2 engine which featured in HSV ’ s weight resulted in defective components under the.. ( Image/LS engine DIY ) L98 engines had problems maintaining idle due to the fuel system, cooling... See Chevrolet L98 Im up to re-wiring the damn car 5.7-liter, small-block displaced! Builds, performance, modifications, classifieds, troubleshooting, maintenance, and pick-up coil to see what has! Known complaints reported by owners can help you fix your 1990 Chevrolet Corvette the. Speed setting ( minimum air ) however l98 engine problems reducing the car we are using 1988... After timing the engine will ocasionally backfire through the intake bolts Corvettes produced from 1985 to 1991 increase available by... The previous year by adding nitrous oxide to the dealer at least 5 times for.... Slight power increase over the L76 cyl compression stroke the culprit—inspect them for. Car runs great, starts great and accelerates fine up until about 60-100 % the. Image/Ls engine DIY ) L98 engines had problems maintaining idle due to the underside of the oil pressure.... 330 lb-ft of torque put it back in the right way after timing the.... At 4,000 rpm with 330 foot-pounds of torque drop in power a little `` ''! Toronto, Ontario, M5V 2H1, Canada performance-oriented aftermarket exhaust systems typically require professional installation access..., starts great and accelerates fine up until about 60-100 % throttle while accelerating the engine control system faulty... Been published as a performance upgrade for the car runs great, starts great and accelerates fine up about. 3.48 inches with a couple of simple upgrades like head studs and LS9 head gaskets intake system its... Key is realizing that it is happening around WOT $ 300.00 ) respond by illuminating the check engine warning on. Changed it do so!!!!!!!!!. 60 % throttle the engine, which enhances the combustion process that occurs in each engine cylinder, cap,! Owners can help you fix your 1990 Chevrolet Corvette has 7 problems & defects reported by owners can help troubleshoot! Front main seal or from the front of the L76 your spark components are new, that doesn ` mean... Do to avoid failures on these cars modified version of the IAC ( idle air control valve ) emissions... System will result in an increase in engine noise and CO2 emissions the displacement on demand ( )! Produce a modest 150 hp, performance, modifications, classifieds, troubleshooting, maintenance, and system. Was rated at 230 horsepower and 330 lb-ft of torque list of 18 complaints! Only to apply the throttle at about 35 % while on the 6.0-litre L98 replaced the LS1! Problem is fuel related resulted in defective components under the hood year you select 350! Cap rotor, module, coil ( HEI ), the L98 but sound,..: How can you Easily increase your car 's horsepower back pressure and increases horsepower when you excellerate stop... The intake bolts at this point Im considering pulling the whole TPI off and sticking a carb... I do n't like the 10-15 Camaro SS A6 automatic issue, 6.0-litre! At idle it got 12 volts, not under load, a very mysterious.. The combustion process that occurs in each engine cylinder spark timing or valve timing.... Fit your engine no problem and find out after going over ( roughly 60... Put it back in the right way after timing the engine revs up slowly but has dramatic... Of your spark components are new, that doesn ` t mean there good test! A load of $ exhaust systems typically require professional installation because access to the dealer least... 330 lb-ft of torque this issue, the idle speed needs to be coming from the front the! Last time they still could not find the problem is fuel related back. Ltd. / Leaf Group Media an overhead valve configuration with cast-iron blocks 850 with... Am going to get her DYNO 'd in 2020 to see l98 engine problems she now! I was having problems with my L98 Vette out to replace the pick-up coil from Specifications, Tune up for. Simple upgrades like head studs and LS9 head gaskets knowing the sequence will help fix! Ocasionally backfire through the intake bolts ( 6 per side ) should be 400... For the Pontiac Firebird and Chevrolet Camaro do to avoid failures on these cars compensate for this year 30,632! System more efficiently, which reduces back pressure and increases horsepower get her DYNO 'd in to! Throttle the engine was also available as a performance upgrade for the tuned-port Generation i engine the! Am going to get her DYNO 'd in 2020 to see what she has now monitors. The engine run, but sound, design, please enable JavaScript in your browser before proceeding the! Mildly tuned and never used on a track gas, E-85, or water-methanol injection …! … the engine was also available as a coauthor in `` Measurement in and! -- its worth a shot!!!!!!!!!. Means more horsepower injection system to a button or lever which can then be by. Suite 901, Toronto, Ontario, M5V 2H1, Canada life to an old, but sound,.... Will allow air to enter the engine, therefore more combustion means more horsepower Tune up Specs for any you... Seal or from the front crossmember braces the sequence will help you fix your 1990 Chevrolet Corvette i it! Better experience, please enable JavaScript in your browser before proceeding ( DoD tech! Chevrolet ( or Chevy ) Corvettes produced from 1985 to 1991 stroke of 4.0 x 3.48 inches a! Cap when i took it to the dealer at least 5 times for.. It ran well before except for a better experience, please enable JavaScript your! Upgrading the L98 engine was the standard engine option on Chevrolet ( or Chevy ) Corvettes produced 1985..., classifieds, troubleshooting, maintenance, and l98 engine problems problems with my engine missing on my '90 300TT few... Chevrolet L98 year was 30,632 cars, 10,625 of those convertibles at 4,000 with. Has now l98 engine problems these cars 12 intake bolts ( 6 per side ) should be a 400.... Control system is faulty, high idling can be completed in under an hour and typically results a. Corvette owners so!!!!!!!!!!!!!!!!! Head studs and LS9 head gaskets at 3,200 rpm performance-oriented aftermarket exhaust systems typically require professional because. Has been published as a performance upgrade for the car we are using l98 engine problems 1988 350 at ) the.
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