O/T bucking Chevy

jay-eye-see · Dec 11, 2008

I posted on this a couple weeks ago and got some good thoughts and ideas but nothing has worked out. I had taken a perfect running 2.2 out of a deer damaged 2000 cavalier and put into straight high mile sunfire with a bad motor. Lesson here is that its not always possible to polish a turd. It has no codes but has a bad surge on mild acceleration. seems like lack of fuel but hard acceleration is smooth. Replaced plugs, fuel filter with new and a host of other things with extra parts from other car. I have had experience with the lock up converter problems in the gm trannys and this is not going on here. Lucky this isnt my only car , thanks for any thoughts

twopop · Dec 11, 2008

02 sensor

Don-Wi · Dec 11, 2008

My wife's got a 97 Lesabre with abo0ut the same problem. Under a light acceleration it seems to jump between 2 gears. Same thing if I lock in the cruise at about 55-60 MPH.

Donovan from Wisconsin

jay-eye-see · Dec 11, 2008

I need a dramamine if I set the cruise on this thing

Anonymous-0 · Dec 11, 2008

Same engine and year for sunbird?? if not the computer(ECU) needs changed. Throttle position sensor may have a bad spot, vacuum may be allowing fuel to go back to tank instead of to injectors, fuel pump may be weak(HIGH MILE). You need a scan tool that will "snap shot" engine parameters when problem occurs.

jay-eye-see · Dec 11, 2008

00 cavalier engine into 01 sunfire. didnt change the ecm. both were 2.2 engines. Used intake from sunfire so I later changed the TPS and rail/injectors from Cavalier as they were known to be good.

DerbyCity · Dec 11, 2008

A lot of those GM cars have crank sensors that act up, but won't throw a code. My "Burick" did it about a week ago.

dave guest · Dec 11, 2008

You are to be congratulated on making that swap at all. Since we have cars computerized. I see a lot of problems with different engines in different cars. Wish I could help. Post what happens. Need to know.

Brian Jasper co. Ia · Dec 11, 2008

Just because they are both 2.2L doesn't mean they're the same engine. Use all of the powertrain management sensors that are original to the car you're using. Don't swap PCM's. Use the injectors original to the car. Do a slow sweep test with a digital ohmmeter on the throttle position sensor looking for a gradual change in resistance. Any large jumps, the sensor is faulty. You're certain you have no vacuum leaks? No holes in the air duct between the throttle body and mass air sensor? No foreign objects covering the mass air sensor? Map sensor has it's vacuum line intact with no frozen moisture in it? Have you checked exhaust back pressure from the pre catalyst sensor hole? Lightly restricted exhaust will cause part throttle misfires that go away under heavy acceleration. 1 psi or more is unacceptable back pressure.

Revredneck · Dec 12, 2008

It sounds to me like an ignition problem. Did you bump the coils on the back side of the engine? You either have a cracked coil tower or a bad plug wire on there. Use a spray bottle and mist some water on the ignition system with it idling and watch for fireworks. It should be a simple fix, unless you have to swap out one of those coils!
Good Luck and God Bless.

O/T bucking Chevy

jay-eye-see

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twopop

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Don-Wi

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jay-eye-see

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Anonymous-0

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jay-eye-see

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DerbyCity

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dave guest

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Brian Jasper co. Ia

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Revredneck

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