Flashing check engine light

Discussion in '2.3L (N/A & Turbo) Tech' started by DougNuts, Nov 25, 2003.


  1. DougNuts

    DougNuts Founding Member

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    Occasionally while on the highway my check engine light will flash on and off. I haven't found any pattern or any certain condition that causes it (like going up hill).

    I installed a new O2 sensor, but that didn't solve the problem. I'm also averaging about 20mpg. :notnice:

    Ran the codes the other day and I'm pretty sure it came out with something about the PIP sensor and the thermactor.

    Any ideas?
    #1
  2. i4power

    i4power Founding Member

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    If it's flickering on and off, it might either be teetering along the edge of pass and fail in terms of the parameters for the light to come on, or there is a lose wire that causes intermittent signals (hence the flickering). Check your connections to the sensors in question from the code pull, and repair/replace as necessary.
    #2
  3. mr_woodster

    mr_woodster Active Member

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    ya, ive been getting that check engine light syndrome aswell.....i just like to think of it as a shift light, after all its so close to the tach :D
    #3
  4. jman_b13

    jman_b13 Founding Member

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    well crap i didn't completly read your message, time to break out the voltmeter and start testing sensors
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  5. DougNuts

    DougNuts Founding Member

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    Shift light, LOL.


    Sounds good guys. Since no one knows a certain problem that causes this, I will check the car out over Thanksgiving. :nice:
    #5
  6. HOWNDOG

    HOWNDOG Member

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    .....sometimes moisture etc. can screw with it. It doesn't always warn of an actual bona-fide problem (hence the term "idiot light).

    Cheap fix - remove bulb and sell at parts meet.


    BTW, If it was a "smart" light it would know that you already checked the engine. DUH. :D


    HD
    #6
  7. mr_woodster

    mr_woodster Active Member

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    so how much does this usualy fetch these days, i mean these things have got to be colectors items by now!
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  8. HOWNDOG

    HOWNDOG Member

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    ...depends on if it's the blinking kind or the steady on one and if there's a couple ricers at the meet to bid against each other.

    HD
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  9. MSM0075

    MSM0075 Member

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    How do you go about testing your sensors? I get a check engine light randomly as im driving down the highway from work...

    I've ran codes many times and only brought up idle problems..

    I get an average of 16.5 MPG..sad sad sad. car also smells like its running REAL rich sometimes...

    Now that would lead to a bad o2 Sensor right? then why didnet the scaner bring that up? I also tryed unpluging the o2 sensor and drove the car and it dident change a thing.
    #9
  10. DougNuts

    DougNuts Founding Member

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    Exact same problem that I'm having. I changed the o2 sensor and that didn't do a ****ing thing for my milage or the light. If you figure it out, let me know. I'll take a good hard look at the car this weekend to see if I can figure anything out.
    #10
  11. mr_woodster

    mr_woodster Active Member

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    id check all the senors under and connected to the lower intake, aswell as the vaccum lines(which tend to be brittle and break). I just cleand under my intake (had the car on the lift, so i figured id clean it a little), unplugged them all ,cleaned of windblown oil and residue, and reconnected them. So far no check engine light, but that my just be a strand of good luck im having...i hit 3 green lights in a row today!
    #11
  12. ka0tyk

    ka0tyk Founding Member

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    just run a KOEO test and it will get readings from all teh sensors and tell you which ones are faulty with a code...
    #12
  13. DougNuts

    DougNuts Founding Member

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    I got 24.6 mpg on a 256 mile trip tonight. That's after a new set of plugs and wires. Nothing to write home about, but that's the best I've gotten so far. A little more tuning and maybe I'll get it 25+!!

    I still am getting the check engine light, it usually comes on as I'm cresting a hill or as I am going down one.
    #13
  14. Wyatt

    Wyatt Founding Member

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    don't know whats up with my engine light, but it will go out if I rev the engine to somewhere around 3500, but for the most part it stays on all the time now, before that it use to go off and on when I rev'ed the motor but now its just on up till 3500.

    anyways guess I will be checking all my sensors.
    if anyone has a clue to what could be wrong I'd be so happy.

    besides that the car runs fine.
    #14
  15. kiddiccarus

    kiddiccarus New Member

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    I made sure that the plugs and wires were fully seated and checked vaccume lines and the light went off. For now.......
    #15

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