Motor vibration

I have an 87 s10 pickup with a 2.8. It has a bad vibration in the motor, already checked harmonic balance, torqe converter, timing bla bla bla everything i could think of, cant figure out why it has vibration sitting at idle and going down road not as bad moving though but defi noticble, any ideas????????????????????????????????????????????

Any strange noises?

Most likely the EGR valve. Remove, clean ports and get a new valve...:banghead:


I have an 87 s10 pickup with a 2.8. It has a bad vibration in the motor, already checked harmonic balance, torqe converter, timing bla bla bla everything i could think of, cant figure out why it has vibration sitting at idle and going down road not as bad moving though but defi noticble, any ideas????????????????????????????????????????????

When mine had that it turned out to be one of 2 tranny mount bolts broken, few missing connecting bolts between tranny and engine on top and side, and engine mount rubbers worn out from the excessive movement allowed by missing tranny bolts.

I had the same problem on my '92 4.3 though. I replaced the map sensor and gave it a tune up and ran fine.

thread is now over a year old. please refrain from posting in old threads :nono: .