A year ago, I was looking to arrest the jerking motion of my transmission/engine after shifting into drive and park (it's an automatic transmission). I finally changed the tranny mounts and the engine mount (cost me $180 including installation). The problem however is still there, but only lightly. My pursuit is to totally elliminate this jerking motion. I am aware that the engine is heavy and my mechanic said that this jerking motion is absolutely normal. Any advice besides what I have already done? Should I just suck it up and live with it?

Ty, Chris.

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1986 GT Fiero Owner & Enthusiast

Check the dogbone. make sure all bolts are tight on all mounts.

I am not sure what year...but some fieros had a small shock type thing on the firewall side of the engine ( some don't)
I added a dodge truck motor mount back there( made own brackets) no jerks now( except for the driver )

Dog bones are under $10.00 at Advance Auto.

changed the dogbone as well, any other suggestions?

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1986 GT Fiero Owner & Enthusiast

Just a question or two- You are an automatic. What's your idle speed? If too high you could be feeling the tug of the torque converter. Another thought would be if this was a lockup torque converter. There are threads here that describe how to troubleshoot this. I THINK there is an electrical connector that actually does the locking up. You may be able to simply disconnect and give it a try.

sjmaye, my car idles at just above 1000. Any idea?

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1986 GT Fiero Owner & Enthusiast

quote Originally posted by chrismclubm: sjmaye, my car idles at just above 1000. Any idea?

Love to help, but the truth is I am a noob on automatics. I have just read a bunch of posts. My car idles around 1000 as well. I thought it was kind of rough when I put it in gear. I found some the cradle bolts loose. it helped a bit, but still not what i wanted. I now have the entire engine and transmission out. The transmission will be changed with a newly rebuilt one as I also had issues with the valve body (I think) everytime the car shifted. It will be a month or two before I have it running again to see if it is better.