Help won't run right

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Sep 16, 2008 | 04:55 PM

bigjohnson

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From: bartlesville, ok

Help won't run right

I'm trying to fix a buddies camaro. Its a 2002 z/28.It has a weird runability issue that no one can figure out so far. It runs ok 3500 rpm and then it acts like it loses a few cylinders, runs like total **** and wont idle for a bit, and then goes back to running ok again.Anybody have any ideas how to fix it?

Last edited by bigjohnson; Sep 16, 2008 at 07:32 PM. Reason: I had the wrong year of car.

Sep 16, 2008 | 05:07 PM

keliente

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From: Mooresville, NC

Runability...?

Does it have any stored codes?

Sep 16, 2008 | 05:15 PM

ZexGX

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From: under a JEGS hat

Quote:

Originally Posted by keliente

Does it have any stored codes?

x2

Tried checking/changing the fuel filter?? How many miles on the car? Check any vacuum lines...

Last edited by ZexGX; Sep 16, 2008 at 05:47 PM.

Sep 16, 2008 | 05:42 PM

Bizzles

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From: Central Jersey

Loose connection to sensor or valve?

Sep 16, 2008 | 06:44 PM

nemss1

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From: Edmond, OK

possibly a bad A/F ratio. a tune might help

Sep 16, 2008 | 07:27 PM

bigjohnson

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From: bartlesville, ok

It's an '02 z/28 6 speed car. Ported throttle body that came off a goat, air box has been modified to move more air, bigger cam, ported heads, headers, no cats, computer tuned by speed inc. The car ran fine for quite some time after these mods, went 12.60s @ 114 mph on street tires. We've replaced the O2 censors, plugs, wires, map censor, maf censor, intake gaskets, fuel pump (fuel pressure was low went we tested it, was the first thing we checked), and tried an different computer and it did the same ****. It's had a map censor code, the code went away for a short time after replacing it . It was running correctly for about 10 minutes and then it went back to it's old ****. So there you have it, a recipe for making your hair fall out prematurely and money disappearing quickly! The weird thing is...the problem is completely consistant, the rpm at which things go south and the way it returns to "normal" never changes.