1990 corvette runs rough

Discussion in 'C4 Forum' started by Darryl L, Oct 14, 2017.

  1. Darryl L

    Darryl L Member

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  2. Darryl L

    Darryl L Member

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    I got a hold of him and he gave me a few things to look at. I'm going to tinker with it a bit tomorrow and I'll let you know how it went
     
  3. Darryl L

    Darryl L Member

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    I installed a new TPS and it runs good in the shop. It hasnt flooded out yet It's winter here and to snowy to test drive to be totally sure but I'm keeping my fingers crossed lol
     
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  4. Black 03 Z06

    Black 03 Z06 High RPM Poster

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    Snow? Man I hope you have found the cause and made the repair, spring is just around the corner.

    Good luck with it Darryl.
     
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  5. Corvetteplus

    Corvetteplus New Member

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    customers of mine had the same problem, couple of them had a burnoff relay issue ( relay was toasted and killed the wire plug as well ) it is right nexy to coolant/MAF relay package next battery, some others had to changed all injectors, those are common problems on the L98 engines. call me if you need more infos
     
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  6. Darryl L

    Darryl L Member

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    Hi! Nice to meet you, and thanx for the info. This is my first C4 lol. Iv'e owned a few C3 cars and a C5. I only worked on the C3 which is a totally different beast lol. As I write this, a good friend of mine is picking up a factory shop manual with supplement to help me learn the car a lot better. I have to admit, I saw what I thought was a bit of crappy looking wiring and some sort of relays behind the battery but didn' know what that area was all about lol. I better pull the battery and have a seriously closer look! Thanx again for the tip! I will let you know for sure what I found ttyl...
    Darryl
     
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  7. seppi

    seppi Member

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    Find the culprit?
     
  8. Darryl L

    Darryl L Member

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    Not yet. I have a code 22 low voltage tps that's intermittent. Ive already replaced the tps with no improvement. My car shows a err message when I try to pull the ccm codes through obd1 port. It reads the ecm history code 22 but won' read the ccm codes! A.c. fuse is ok. I' still hunting lol!
     
  9. seppi

    seppi Member

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    Well I’m no expert but I’ve had the pleasure of re re one the these engine completely on my own. I’m sure you’ve set the tps. It’s pretty simple. Leaking injector maybe?
     
  10. Darryl L

    Darryl L Member

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    The TPS on the 1990 L98 is fixed and does not require .54v setting like the 89 and older ones. Leaking injector may be a possibility. I may just replace them due to their age at any rate. Possibly upgrade them a bit to suit the engine build specs. It' Now running a LT1 cam with 1.6 rockers, custom ported heads with 10.5-1 pistons. I still have a few ideas up my sleeve. It' winter here and its hard to have to heat the shop up to tinker so I've been doing work on the warmer days to save energy lol.
     
  11. seppi

    seppi Member

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    Right. I just bought an 87. Didn’t even realize about the tps changing although I installed a 91 l98 into a 88 c4. I’ve read your posts. Only thing I can think of is leaking injector filling the cylinder. Winter here also Darryl:( but my car is tucked away and I have no access to tinker. Hope you find the issue.
     
  12. seppi

    seppi Member

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    I had a leaking injector with the 91 engine btw. Didn’t stall or smoke slow leak after shutdown while hot. Only affected hot starts just took a few more turns to fire.
     
  13. Darryl L

    Darryl L Member

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    Hi! My injectors seem ok. I am finding a low voltage on the tps! I cannot figure out why though. It has a new tps installed with no results. Still kicks error code 22! I also found an err code from the ccu to the pcm. I' going to pull the bottom of the dash and check out what's happening underneith. It has a aftermarket stereo in it and I'll have to see what they used for power, ground etc...
     
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