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Thread: The ol' girl is at it again

  1. #1
    Join Date
    Feb 2016
    Location
    Cincinnati, OH
    Posts
    198

    The ol' girl is at it again

    To start, the car has just straight up died on me twice. Once backing out of the garage and a week or so later dying about to pull into the garage. After the second time, I decided to check if there were any codes. Interestingly enough there weren't any.

    Next we have an issue of it going very rich to very lean at idle. Sometimes it plays nice and won't do it, but if it does, it might fix itself. It also won't show up when cruising. It doesn't seem to bog down or hesitate in acceleration.

    I'm willing to try anything at this point
    Matthew "Dale" Johnson
    ~"If it looks dumb and works, it's not dumb"

  2. #2
    Join Date
    Dec 2007
    Location
    Salem OR
    Posts
    7,142
    What year?

    When it dies, how many tries to get it running?

    What was the last work you did on it, and what were you attempting to fix at that time?

    Mods? Running a chip/tune?

  3. #3
    Join Date
    Feb 2016
    Location
    Cincinnati, OH
    Posts
    198
    It's a 1989.

    If I remember right, it took about two tries to restart.

    I think the last work that I did to it was;
    -Replaced the forward harness to the DIS and crank sensor.
    -I swapped out the DIS, crank, and MAF sensor. Also replaced the O2s.
    -Replaced the fuel pump, sock, and filter just to make sure none of those would be an issue. (I have the old pump just in case)

    I vaguely remember why I did all that...might have been another drivability issue. Hell, it's probably the same issue if not the same. I did notice that after replacing the O2s, it ran much better and I felt that was the final fix.

    It does have a chip (supercoupesunlimited)

    Mods
    -a/c delete
    -egr delete
    -double intercooler w/ raised sc top
    -screaming demon coil pack
    -March pulleys
    -10% sc pulley
    -76mm MAF
    -75mm throttle body
    -38lb injectors
    -255 fuel pump
    -Long tube headers
    -built trans w/ shift kit
    Last edited by Matt_aka_Dale; 09-21-2019 at 04:05 PM.
    Matthew "Dale" Johnson
    ~"If it looks dumb and works, it's not dumb"

  4. #4
    Join Date
    Jul 2005
    Posts
    452
    Good evening


    It appears you need an OBD 1 scanner with live data capabilities or access to datalog information. Your problem might be a suspect engine coolant temperature and or barometer sensor readings.

  5. #5
    Join Date
    Feb 2016
    Location
    Cincinnati, OH
    Posts
    198
    I should have access to a scanner no problem. But a bap sensor? I've only ever heard of this one other time, though it wasn't for my vehicle. If these 'suspect sensors' are in question, would backprobing with a multimeter show any signs of an issue?
    Matthew "Dale" Johnson
    ~"If it looks dumb and works, it's not dumb"

  6. #6
    Join Date
    Dec 2007
    Location
    Salem OR
    Posts
    7,142
    Quote Originally Posted by Matt_aka_Dale View Post
    ..would backprobing with a multimeter show any signs of an issue?
    Perhaps - see this post for process:http://www.sccoa.com/forums/showthre...93#post1121893 - note I would use a DVOM, tho.

    Keep in mind...

    Which is Not a Symptom of a Potentially Bad ECT Sensor
    • Continuous rich air-fuel mixture
    • Continuous lean air-fuel mixture
    • Rough idle
    • Engine misfire
    • Engine stalling
    • Increased emissions
    • Increased fuel consumption

    Answer is: misfire…


    Also see this one: http://www.sccoa.com/forums/showthre...ing-System-Fun

    And since you're running a chip, I'd keep expectations low if you see what's up using an OBD-1 code reader.

  7. #7
    Join Date
    Feb 2016
    Location
    Cincinnati, OH
    Posts
    198
    I've had a code for the sensor coolant before, but was from KOER and I might have forgotten to plug it in or something. I don't recall exactly, but there was a code. Plus it continues to give me a code 19.
    Matthew "Dale" Johnson
    ~"If it looks dumb and works, it's not dumb"

  8. #8
    Join Date
    Feb 2016
    Location
    Cincinnati, OH
    Posts
    198
    I don't know if I will try this, but my co-worker suggested that I try running the car without the chip in.
    Matthew "Dale" Johnson
    ~"If it looks dumb and works, it's not dumb"

  9. #9
    Join Date
    Feb 2016
    Posts
    25
    Why would you do that? You have 38# injectors, 30# is stock, so something could go wrong if you take out the tune. Plus your using 75mm throttle body stock is 65mm.

  10. #10
    Join Date
    Feb 2016
    Location
    Cincinnati, OH
    Posts
    198
    I didn't think I would anyway, but like I said, I'll try anything at this point. Just fire the parts cannon it. I've lost what little free time I've had to try and test things and honestly might sell/trade the car. Pretty tired of it. Can't continue any other work on it when something mechanical keeps happening.
    Matthew "Dale" Johnson
    ~"If it looks dumb and works, it's not dumb"

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