Mechanics

SPUTTERING AND OCCASIONAL UP AND DOWN

1989 Oldsmobile Ciera

Engine Performance problem
1989 Oldsmobile Ciera 4 cyl Front Wheel Drive Automatic 150000 miles

I have a 1989 Oldsmobile Cutlass Ciera with the 2.5L Iron Duke engine. It sputters when I rev it up just a little and sometimes it idles up and down. The only way I know to stop it idling up and down is to shut the car off then turn it back on, then it'll rev a little high (1400 rpms) then the rpm's back down to normal (800ish rpms).
I was doing some wikipedia research and they recommend that I replace the map sensor, egr valve (doesn't stick, but may have weak springs), and oxygen sensor. I dont have any trouble codes, but these parts are at least 40,000 miles (about 3 years) old. Should I replace them?

By the way, I have replaced just about everything you could imagine except for these 3 parts, and vaccum lines don't leak.
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24sparrow
June 12, 2010.




I wouldn't replace anything unless something pointed me in that direction. I'd take the throttle-body off and clean it, check the iac and tps. A bad gasket could cause a vacuum leak.

Tiny
Internetmechanic
Jun 12, 2010.
Ok, it could be a bad gasket. I replaced the tps and iac, but not the throttle body to intake manifold gasket. I ordered the gasket today and it will arrive on Monday so I'll definitely try replacing that. I'll let you know how it goes.

Tiny
24sparrow
Jun 12, 2010.
It didn't work, I probably just have a worn camshaft or timing gear.
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Tiny
24sparrow
Jun 15, 2010.

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