Question about 1994 Oldsmobile Cutlass Supreme

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Have a 94 Cutlass 3.4 that idols irratically. We have replaced coil packs, spark plugs ans wires, and the iginition modual. What else can it be?

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  • lwaz73 May 11, 2010

    Checked the intake and it did not seem to be leaking. Checked the EGR valve and not sticking. Any other ideas?

  • lwaz73 May 12, 2010

    The cjeck engine light does not come on. We brought it get the codes checked but without the light being on there is no code. I will have to see if I can get a scan tool and test that. I will let you know. Thank you for all your help.

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Check the engine for vacuum leaks around the intake gaskets.Just spray it with carb.cleaner or brake clean while the engine is idling.While you spray around the intake if it is leaking you will hear the idle smooth out when you spray where it is leaking.Also check the egr valve and make sure it is not sticking slightly open.Check all the vacuum lines.Hope this helps.Good luck.

Posted on May 08, 2010

  • Salvador Quintanilla May 11, 2010

    Is the check engine light coming on?If it is then check the codes and let me know what you get.One other thing you can do is relearn the idle air control.You need a scan tool to do this.

  • Salvador Quintanilla May 12, 2010

    If the light is not on the computer should still have the code or codes in memory.They do not go away when the light goes out.One other thing that could be the problem is that you might need to relearn the idle air control valve or you could have a bad PCM.For the idle learn you will need a scan tool that has these capabilities.A good way to check the PCM is to pull it out without unplugging it a do a tap test on the side that has a cover that comes off.Just take the end of a screw driver and tap it lightly.If it is bad the vehicle will start to stumble and and even stall.Hope this helps and don`t for get to rate me.

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