Question about 1992 Pontiac Firebird

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1995pontiac,firebird6cyl,sputters at 2000rpm

Checked.ecm.power to injectors.tune up still sputters at 2000 rpm any ideas

Posted by Brian Blaney on


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Terry Hair

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When you say "sputters at 2000 rpm" , are you referring to ANY time the engine is at 2000 rpm - meaning in Park, when you are just goosing the throttle, or in gear when you are accelerating, or at highway speed in high gear? If you are experiencing a "shuddering" in the engine at certain speeds/rpms - especially if these are speeds you regularly cruise at (long commutes at steady speeds), the problem could be in the Throttle Position Sensor (TPS). They have a tendency to wear unevenly if you drive a certain steady speeds. Eventually, the problem would progress to an engine code, but it may occur without setting the check engine light.

Posted on Jan 01, 2014


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Clint Smock

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SOURCE: 1999 Grand Am 3400 v6 misfire.

I was asking about the pushrods because I had this problem with one of these engines that had a bent push-rod. I robbed a push-rod out of an older 3100 and it was just a fraction of an inch longer which bottomed out the lifter. I figured it out by removing the valve cover and loosing the rockers when it was running and it smoothed out. I'm guessing you checked for vacuum leaks already. How about injection pulse on the number 6 cylinder when running. Another thing you could check is running compression. You said you checked compression but did you just check cranking compression or did you check running compression too.

Posted on Apr 09, 2010


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[email protected] soon as the car reaches 2000 rpm it just sputters and wont go over 2000rpm

Thanks for choosing FixYa and welcome Chris. This is a sign of low compression. You need to check the stored codes in your computer. Your check engine light should be on. You need to scan your computer for codes. Is it on?

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