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Cadillac Seville / Cadillac Eldorado Forum Discussion, Car Will Not Start - 2001 STS in Past Cadillac Vehicle Discussion; Yes. The IAC (as the name implies) controls idle air. The engine will run with it clogged if you know ...
  1. #16
    Ranger's Avatar
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    Re: Car Will Not Start

    Yes. The IAC (as the name implies) controls idle air. The engine will run with it clogged if you know it and control the idle air with your foot, much like the old carburetor idle screw. That said, I would suspect a dirty TB as opposed to the IAC valve. They rarely fail, but the exhaust side of the air circuit is on the dirty side of the throttle plate and if it gets carboned up, the engine looses it's ability to breath at idle.

  2. #17
    PDT14 is offline Cadillac Owners Member
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    Quote Originally Posted by basscatt
    just from my own personal observation -
    a misfire is most often caused by lack of spark -
    compared to lack of fuel -

    if that follows true in your case -
    you have been pumping raw gasoline into the cat converter -
    ever since you got that first P0300 code - "for quite some time"

    it is very possible - if not probable - that over time -
    the catalytic converter has clogged up -
    and THAT is causing the no-start condition -

    you can try unbolting the cat - and move it slightly out of the way -
    and see if it will start -
    I'll have to give that a try tomorrow. If it starts, do I get e new cat or clean it out?

    ----------

    Quote Originally Posted by Aztec ETC ECS
    Both coil packs share a common primary ground on the right rear of the engine.
    Check for loose, corroded or broken.
    If you can't find it, ground the "B" (black/white) wire on each connector.
    I'll look for it and see what it looks like.

    ----------

    Quote Originally Posted by Ranger
    All this sounds like an idle problem. When was the TB last cleaned?
    I checked it a little while ago and there was a very little bit of residue but mostly pretty clean. I cleaned it out and didn't notice a difference.

    ----------

    Quote Originally Posted by Aztec ETC ECS
    Ahh. Stuck IAC?
    Should it start w/the pedal down?
    I tried to start it with the pedal down and nothing.

  3. #18
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    Re: Car Will Not Start

    I'll have to give that a try tomorrow.
    If it starts, do I get e new cat or clean it out?

    you would replace the cat

  4. #19
    PDT14 is offline Cadillac Owners Member
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    Quote Originally Posted by Ranger
    Yes. The IAC (as the name implies) controls idle air. The engine will run with it clogged if you know it and control the idle air with your foot, much like the old carburetor idle screw. That said, I would suspect a dirty TB as opposed to the IAC valve. They rarely fail, but the exhaust side of the air circuit is on the dirty side of the throttle plate and if it gets carboned up, the engine looses it's ability to breath at idle.
    I'll also take a closer look at the TB tomorrow and see what I can find.

  5. #20
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    Re: Car Will Not Start

    Quote Originally Posted by PDT14 View Post
    I tried to start it with the pedal down and nothing.
    Keep in mind that pedal to the floor is clear flood mode and that shuts down the injectors. Partial throttle is OK.

  6. #21
    Aztec ETC ECS's Avatar
    Aztec ETC ECS is offline Cadillac Owners Connoisseur
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    Re: Car Will Not Start

    Quote Originally Posted by Ranger View Post
    Keep in mind that pedal to the floor is clear flood mode and that shuts down the injectors. Partial throttle is OK.
    Yes. Thats why I said pedal down, not floored. Should have clarified.
    Having said that, What if the TPS is shorted to the WOT position? Unplug that?

    Have you tried spraying carb cleaner into the TB & try starting. That should tell you fuel or spark.

    I think we covered just about everything. Unless it jumped time.

  7. #22
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    Re: Car Will Not Start

    Quote Originally Posted by Aztec ETC ECS View Post
    What if the TPS is shorted to the WOT position? Unplug that?
    Hmm, never considered that. I suppose if that where the case, unplugging it might help.

  8. #23
    PDT14 is offline Cadillac Owners Member
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    Quote Originally Posted by Aztec ETC ECS
    Yes. Thats why I said pedal down, not floored. Should have clarified.
    Having said that, What if the TPS is shorted to the WOT position? Unplug that?

    Have you tried spraying carb cleaner into the TB & try starting. That should tell you fuel or spark.

    I think we covered just about everything. Unless it jumped time.
    I thought you meant floored. I tried pedal down and nothing.

    I unplugged the TPS and tried to start. nothing.

    I sprayed carb cleaner into the TB and tried to start. Nothing.

  9. #24
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    Re: Car Will Not Start

    Hmm, That's starting to sound like you have no spark.
    Tankboy40 and Tankboy40 like this.

  10. #25
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    Sounds similar to the problem I had..
    Change the plugs and wires!! Clean the TB and check (if you can) vacuum lines

  11. #26
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    Re: Car Will Not Start

    No spark plug wires after '00 Jake.
    Just out of curiosity, how are the CKP?

  12. #27
    PDT14 is offline Cadillac Owners Member
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    Quote Originally Posted by N*Caddy
    No spark plug wires after '00 Jake.
    Just out of curiosity, how are the CKP?
    Not sure? I was wondering if that would be an issue without a code being thrown. How do I test?

  13. #28
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    They're known to cause stalling without throwing codes. But I think if they were bad enough that the engine won't start, There'd be a code by now.

  14. #29
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    Re: Car Will Not Start

    A CKP (or the CMP, VSS, ISS, others) is a Hall effect trigger - a ferrous metal mass (think: one gear tooth) passing in extremely close proximity to the face of the sensor causes a tiny voltage spike in the sensor coil. That (those) spikes are what's read and monitored by the PCM to trigger ignition coils and injector pulses.

    So ............... You could hook a questionable sensor up to an oscilloscope and wave a wrench past the face of the sensor - the 'scope should show a voltage spike each time the wrench passes the sensor.

    Here's a graphic of the pre-2000 waste spark ignition system - it shows the CKP's and crank reluctor wheel as well as the right bank exhaust cam sprocket - which has a bump to trigger the CMP. An aftermarket standalone ignition system might use a harmonic balancer flying magnet trigger wheel to do the same job.

  15. #30
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    Re: Car Will Not Start

    As you can see the CPK are connected to the ICM (Ignition Control Module). It is the thin module underneath the coils. Most people will not think much about that but is actually a module (capable to control the engine ignition when the PCM is out). The CPK sensors are read by the ICM and then the signal is sent to the PCM on the 24X and 4x line. That's how the PCM knows where is the engine at in his rotation.
    Unfortunately the '00+ cars having coil on spark and cassettes is a bit different (yet similar concept).

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