I have a 1998 Jeep Grand Cherokee Limited 5.2 V8 4X4.
When I decelerate and have my foot off the brake (10mph or under) and when I idle or go speeds 50mph and up it seems like the car puts and there is a subtle shake that you can feel in the seat and on the floor but not in the steering wheel or brakes. There are no codes, no engine light, and no misfires. I have tried changing the Idle Air Control Valve and it seemed to make it run a little smoother but the problem still persists. I have also done a wiggle test on all the wires on the intake and various other areas around the engine. I have also tried putting gas cleaner in it in case it was just some bad gas but that didnt work either. Any ideas?
I already did OBD2 checks, the only thing that was even close to wrong was the car is running a little rich, nothing out of the ordinary for a car this old. The Catalytic Converter is going bad I think but it has been bad for a while and this problem just started occuring.
Saturday, May 14th, 2011 AT 1:29 AM