Mr Matt

Hi,

I hope someone here can help with this, no mechanic has yet done so. Story is, a while ago, my 6 cylinder, 1996 grand jeep cherokee( Laredo) started bucking slightly, perodically. It eventually got worse to the point it stalled. The crankshaft position sensor was determined to be bad, it threw the code out for this.

Mechanic replaced it using an aftermarket item. Car ran ok, and soon a very slight noticeable shudder would occur as the engine was about warmed up. This tremor is now a strong shudder that usually comes on right before the engine is completely warmed up, lasts about 15 seconds, then all is fine.

You can pretty much drive it around the rest of the day ,even leaving the car off for a few hours but will not do it again, unless completely cooled down.

The only codes it throws now are cylinders misfiring- which is a secondary issue - something is giving the engine wrong information.

I am thinking the new aftermarket sensor, about 3 months old is partly bad or something, but is not giving off codes...


Have taken the jeep to 3 mechanics, one of them the jeep dealer, thinking they have seen everything, but so far this has them stumped.

Not sure if anyone else had this issue, again... hope you can help!

Thanks!

Matt

Bustedback

The misfires are causing the shuddering. When was the last time a complete tune up done?

Mr Matt

I gave it a tuneup after it started.... no change. Again, it is only when the engine gets near to its operating temperature....

Thanks though

dave1123

The aftermarket CPS should have had a paper spacer on the end of it to set the clearance between it and the sensor ring. It may be out of alignment just enough to give a wrong signal to the PCM. Why it's temp related, I haven't a clue.

Mr Matt

Thanks, the paper was there for the gap, I am having it replaced with OEM part - hopefully, it will be better!