Question about 2003 Chevrolet Tahoe

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My 2003 Tahoe idles rough and the check engine light is on.

Replaced all spark plugs and wires, because the codes said muliple cylinder misfires, in fact, over 50.000. We were told the cad/convertors were bad. Had a second opinion, they disagreed. There is a chirping sound,,sounds like a pully. We replaced two belts and a pulley already. runs better with higher octane gas for now, but the light is still on and the rough idle is coming back.

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  • tkderezza Jun 23, 2009

    Thanks, someone mentioned that we might try that. I forgot to mention that it only idles rough when I am stopped, and does better at higher rpms. Would that explain engine light coming on and does that deprive the engine of fuel. Right now, we are wondering about a pump that is at the bottom that would be making that chirping sound that would have something to do with emissions. Hope u understand that, I am def not a mechanic.

  • tkderezza Jun 23, 2009

    Thanks, Going to the shop tomorrow with your suggestions!!!

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Ah yes,someone finally asked this question. This is a long answer so be prepared. It's caused by numerous problems,mostly the ignition control module,the cam sensor,the crank sensor,& more. Vaccuum leaks,like the egr valve,brake booster,etc. The cats are probably fine like you stated. Check the fuel pressure,both running & static. If it drops under 35lbs. static the pump is not doing it's job. Running,should read 45lbs. to 50lbs.

Posted on Jun 23, 2009

  • Pete MacSparran
    Pete MacSparran Jun 23, 2009

    Yea that didn't make much sense,but I'll wing it. Check the fuel pressure first. We'll go from there.

  • Pete MacSparran
    Pete MacSparran Jun 23, 2009

    No the chirping belt is unrelated.

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Sounds like vac leak to me take carb cleaner spray around intake manifold listen for change while engine runnig these veh are known for cracked plenums. hope this helps THUNDERBOLTZ

Posted on Jun 23, 2009

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