Bison Asko

I recently did the thermal pellet mod on the ecentric shaft on my 86 s4 n/a. I did not push in the cluch like some of the threads said to do because I had not joined the forum yet. I pulled the front main pulley bolt by bumping the starter and using a long breaker bar to loosen the main bolt. I then shimed up the thermal pellet and put it back in with 60ft/lbs of torque. I have a shakey idle and i have checked for intake leaks and replaced the injectors also. The engine was tuned up about 3 weeks ago. The engine runs perfect and has good power. The rough idle is the only symptom, and it smooths out perfectly when i depress the gas a tad. I just wanted to know what are the signs of a sliped front bearing or a bad one.

SomeGuy_sg

http://www.mazdatrix.com/faq/pulley.htm

http://fc3spro.com/TECH/PROBLEMS/P1/...IDLE/rough.htm

Aaron Cake

iTrader: (1)

If your front pully looks like this, then you have a problem:



Also, you will find little chunks of chewed up bearing in the oil pan.

RX3SP

iTrader: (62)

Check your end play. If you have no end play then the bearing dropped and got crushed.

Bison Asko

Thanks alot guys, I checked and all the belts line up properly. I am going to get a compression test done today just to eleminate the possibity that the engine is the problem. I have already searched and researched for a vacume leak and have found none. I have most of the emissions stuff blocked off. I used rtv black for the block off plates and also all new vacume lines for the rest of the ECU stuff. I just dont know whats going on. I did notice however the idle gets closer to normal with the BAC unplugged. And it does not stall when I turn the steering wheel or turn on any accessories with the BAC left unplugged. I just dont get it.