I have an 04 cavalier I did a motor/trans swap in a few months ago, the motor and transmission was from the other cavalier I had but she was wrecked up a bit. The other car I had drove perfect, no problems with the engine/trans. I decided to also swap out the motor mounts with some polyurethane mounts to check out how they are. After me and my wife did the swap the car shakes mainly at idle, but also when you are comming to a stop. When the AC is on its 10 times worse and it also throws the catalyst effiency below threshold code...(I also swapped out the cat converter and 02 sensors) Which makes no sense because I have done live test readings with a Snap-On Motus and nothing is abnormal or acting funny. I am lost, neither me or the guys I work with can figure it out. The only thing I can think of is the motor mounts because it is the only thing that is different from the other cav I had. Anyone that can throw me an idea please do so, I also have the PCM from the other cavalier but I dont wanna have to take it to the dealer so they can program it to work with this cavalier and that not be the problem.

The motor mounts will make it shake a little more from stock my 04 fire does the same thing as for the check engine light the only thing I can say maybe a bad o2 or it could be something that might of been missed while doin the swap...

Well what I am getting at is the MIL only comes on WHEN the ac is being used. If I clear the code and drive with the ac off, no light...Turn the AC on it will pop on within minutes or in a couple days.

Looked at our database and you never ordered mounts through us. Not sure who you ordered through and what style mounts you have.... Photos please.


Ours NEVER make a car vib that bad...


-Aaron
www.TurboTechRacing.com

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I got mine from allecotec.com