Question about Saturn SL1

4 Answers

2002 saturn SL1 i.9L has erratic timing display on code reader. Have changed the cps, (when I first got the car it had the CPS stored, I cleared the code and it runs ok sometimes). Now it's got a stumbling idle, not a constant miss. I've changed the crankshaft position sensor but it did not make a difference. Also seems to shift a little erratic too, not smooth but I could live with it..??

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  • bartm55 Aug 07, 2008

    it does not have a cam sensor, it takes the signal of the # 4 plug at the couil pack

  • bartm55 Aug 07, 2008

    sorry this has two coil packs, they are fine, spark is heathy to all cylinders and if the cat converter was clogged there would be a restriction felt at the tail pipe, there is no problem there. Do you know what you are talking about? Are you a saturn mechanic?

  • bartm55 Aug 07, 2008

    there is strong spark at # 4 and I've cleaned the base and wires and contacts. I've also checked for play in the timing chain, it's tight and as it should be.

  • bartm55 Aug 08, 2008

    I have found that # 1 has a misfire, swaped coil packs and wires with another vehicle same results, have already changed and swaped new spark plugs gapped at .040. Timing is still fluctuating at idle and just above idle speeds, smooths out at about 1500rpm. Already checked freeplay at the crank damper and checked the timing gear at the camshaft, no play found. Have eliminated a fuel injection problem because it would not cause a timing fluctuation.



  • bartm55 Aug 09, 2008

    I have checked the compression, swaped the coil packs, wire and plugs with another runnning saturn. recently I found the # 1 cylinder was experienceing a misfire and have swaped the fuel injectors around to see if the misfire moves. I understand the timing jumping around could be the computer trying to compensate for the misfire. I don't understand how the computer could know there was a misfire if the spark is constant, and it is...?? I need a new perspective on this.

  • bartm55 Aug 09, 2008

    Is there a saturn tech on line? It does not have a timing belt, has a timing chain. Tensioner is good. Swaped the injectors stil have the miss on # 1. Misfire gets weaker as the idle increases.

  • bartm55 Aug 09, 2008

    i swapped the injector with the # 2 and still have the mifire on #1. I will check for the proper voltage and resisitance though and use my noid light..hope this works..

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4 Answers

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  • Master
  • 6,966 Answers

Hi,

May I offer alternative possibilities...

Areas to check and pls bear with me if they would seem far off:

  • check the wires going to the injector of #1. One of the wires is always on B+12 when ignition switched is ON; the other should be a pulsating +12/0 and the wire goes to the computer;
  • check for a leak between the intake manifold and the cylinder head. Use a spray carburetor cleaner. With the engine running, spray particularly between intake 1 & 2. In some versions for emission requirement, there is a plugged vacuum port between intake for 1 and intake for 2;
  • another to try is to reroute the sparkplug wire for #1.
Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.

Good luck and kind regards. Thank you for using FixYa.

Posted on Aug 09, 2008

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  • Master
  • 373 Answers

Hi...
You DID almost everything to try fix your car.
If you have GOOD spark,good spark plugs.

Check the SIGNAL to the INJECTOR, #1 you said is missfiring.
you can check with a Normal TEST LIGHT.
On 1 of the wires should be constant POWER 12v.
The other one When the Engine is running. The ECM send a Ground signal A few times per second, The TEST LIGHT should flash quickly.
If the Signal Is not OK. Remove the cover fron the wires and Inspect for missconntact damaged Insilation. Replace as need.
But if the signal is OK.. Remove the injector and inspect and clean as need, With a MILTIMETER chack the ohms.
Must have 13.0 to 15.8 ohms.
If is not with esfecifications or if you see that is cloged. Replace. The injector.
RARE CASES THE ECM come damaged in this Vehicle.

OK... I hope this help to try diagnostic your problem.

Thank you for use fixya.

Posted on Aug 09, 2008

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  • Master
  • 623 Answers

Adjust the timing belt

Posted on Aug 09, 2008

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  • Master
  • 2,028 Answers

Did you check the cam sensor?

Posted on Aug 06, 2008

  • Ryan Rogers
    Ryan Rogers Aug 07, 2008

    It's possible that the coil has gone out, and this may also have to do with the O2 sensor or the catylatic converter being clogged. These can cause a cylinder code as well.

  • Ryan Rogers
    Ryan Rogers Aug 07, 2008

    Check the spark at #4.

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