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Check Engine 1-4 light issue

Discussion in '348/355' started by tcbquattroporte, Apr 20, 2020.

  1. tcbquattroporte

    tcbquattroporte Karting
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    Jan 31, 2014
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    New Mexico
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    Tom
    1995 F355 Spider 6 speed manual, 22,500 miles, recent engine-out major done. Check engine 1-4 light comes on after car warms up and is at idle @ 1000 rpm. Check engine 5-8 light does not come on. Oil pressure indicates about 65-70 psi at idle. When given a little throttle up to about 2000 rpm, oil pressure goes up and the the light goes off. This does not happen when driving the car, only after idle for approx. 10 seconds or so. Car seems to run and drive normally otherwise. Any ideas?
     
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  3. taz355

    taz355 F1 Veteran
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    Feb 18, 2008
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    Need to read the codes. This type of error seems unusual.
     
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  4. taz355

    taz355 F1 Veteran
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    For the check engine light to come on we would need to know if the whole exhaust is stock or what exact configuration you have for
    Headers
    Bypass system
    Cats
    Muffler
    We would also assume your car is for USA not euro
     
  5. Qavion

    Qavion F1 Rookie
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    Perhaps something not put back in the right place or loose connections. Hard to say until we get some codes.

    What sensors and devices are used when the engine is warmed up and idling? Idle air controller, O2 sensors, knock sensor, throttle position sensor (sensing idle), MAF ....?

    Any excess fuel coming out the tailpipes after warmup during idle?
    Do you have regular air filters or oiled ones?

    Some sensor might be slightly out of tolerance, but produces a slightly better reading above idle. How hard is it to swap and/or clean the MAFs on a 2.7 car?
     
  6. 308 GTB

    308 GTB F1 World Champ
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    My F355 Challenge behaves that way too except both CHECK ENGINE 1-4 and CHECK ENGINE 5-8 lights illuminate when the car idles for ~2 minutes and while I'm in the garage area moving slowly. They go out when I get up to speed on the track. They come back on in situations where after I've pitted in I have to drive a distance at slow speeds until I reach my garage spot.

    My car has gutted catalytic converters and a Challenge exhaust (no bypass on those). It behaved the same way with the stock headers that preceded its current Tubi headers.
     
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  8. johnk...

    johnk... F1 Veteran
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    Jun 11, 2004
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    Check the codes. If it only comes on a idle and you have a lambda code (1211, 1212) check for a vacuum leak or misfire. Or it could just be a old O2 sensor.

    Oil pressure 65-70 at idle is normal if the oil is cold. If the oil is up to temperature, it is excessive. That may indicate a bad oil pressure sensor. Normal oil pressure at idle with hot oil is around the first or second mark on the gauge. This would be typical with the oil temp at about 170*F

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  9. tcbquattroporte

    tcbquattroporte Karting
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    This is a 1995 OBD 1 car. There is no plug in for reading codes.
     
  10. tcbquattroporte

    tcbquattroporte Karting
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    Car is USA version. Completely stock exhaust system, nothing changed.
     
  11. tcbquattroporte

    tcbquattroporte Karting
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    Car has two MAF's, one for each bank. I cleaned both of them carefully. No excess fuel coming from tailpipes. Regular air filters, replaced with new ones from Ricambi. Car is a '95, can't use a code reader on it.
     
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  13. tcbquattroporte

    tcbquattroporte Karting
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    A bad oil pressure sensor was my first thought, but why would it only throw the 1-4 bank check engine light? Are there two sensors?
     
  14. tcbquattroporte

    tcbquattroporte Karting
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    My car is completely stock. Did you ever figure out what the problem is?
     
  15. johnk...

    johnk... F1 Veteran
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    Jun 11, 2004
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    Two separate issues. Oil pressure has nothing to do with your codes.
     
  16. 308 GTB

    308 GTB F1 World Champ
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    Hi Tom,

    The check engine lights always come one within a few seconds of each other and extinguish within a few seconds of each other. With the way my Challenge car's exhaust is set up and the tune that it had yielding a slightly rich mixture at idle, we figure this is normal behavior. We never checked for codes. Indeed some other F355 Challenge cars I know do the same thing.

    Below are dyno graphs which show the air/fuel mixture.

    Barry


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  17. johnk...

    johnk... F1 Veteran
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    Barry, not sure why you would suggest that a stock 2.7 355 would behave like a challenge car. My car is a 95 and any CELs and codes have been due to issues that needed to be addressed.

    For the OP. I've attached a pdf on how to read the codes. Note that you may have the hold the button down a little longer (few seconds) that indicated.
     

    Attached Files:

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  18. 308 GTB

    308 GTB F1 World Champ
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    I didn't suggest that at all, John. I specifically mentioned my car has gutted catalytic converters and a Challenge exhaust. I also mentioned the tune done in 2013. As a result, I indicated how my check engine lights behave.

    Despite the appearing and disappearing check engine lights, my car runs fine. As you mentioned, Tom has to pull some codes to narrow down a possible problem. I simply gave him a few modifications that could yield a check engine light.
     
  19. taz355

    taz355 F1 Veteran
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    Can someone please explain to him how to read his codes.
    On an obd1 car you can still read codes.
    I think it explains that in the owners manual, flashing lights on the ecu’s in the back of the cars or something
     
  20. taz355

    taz355 F1 Veteran
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    John I think Barry was suggesting that if some of us want our car to be as fast as his challenge the check engine lights need to flash a bit at idle.
    It’s kind of like flashing your lights to pass in Germany I think. I think Ernie has his 348 set up similarly.

    all kidding aside since we are all really guessing here I want to suggest his cats are shot and are now straight pipes
     
  21. johnk...

    johnk... F1 Veteran
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    I posted a pdf with the details of how to read codes and what the codes are.

    No cats on a 2.7 car won't cause any CEL issues .
     
  22. 308 GTB

    308 GTB F1 World Champ
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    :D
     
  23. 308 GTB

    308 GTB F1 World Champ
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    Then maybe Tom's air/fuel mixture is too rich at idle. That's what we attribute my check engine light behavior to be caused by. One day I'll have my technicians look for codes but my car runs just fine.
     
  24. johnk...

    johnk... F1 Veteran
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    Jun 11, 2004
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    Yes, too rich or too lean. That's why I suggested it could be a vacuum leak, or maybe just a marginal O2 sensor. A small vacuum (or even exhaust) leak can cause an apparent lean condition at idle and push fuel trim to the max causing a CEL. As soon as you open the throttle the metered air swamps the leaked air and the CEL goes out. But we need the codes to see if it's related to lambda control.
     
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  25. yelcab

    yelcab F1 World Champ
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    Post the error codes or it did not happen.
     
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  26. johnk...

    johnk... F1 Veteran
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    CODES CODES CODES CODES CODES CODES ....
     
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  27. jfink

    jfink Rookie

    Jun 20, 2013
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    Charlottesville, va
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    jon fink
    I have experienced a similar situation in my '97 355 spider. many of you have been quite gracious with your time and comments and once I have my reader delivered, I'll get back with those codes. Appreciate all your help !! Cheers, jon
     

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