Look what I found this morning:


http://www.cherokeetech.com/VBull/sh...LINDER-MISFIRE

 

Maybe that will help 831. Haven't heard if he fixed his yet. My jeep is a 98 and doesn't fall into that bulletin. But there is a bulletin for the weak valve springs in the 1998 Cherokees.

 

Thanks for all the help!!

 

Interesting, I hadn't seen that one. The one I saw applied to (I think) '96-'99 4.0s, and called for running the CCC and replacing all the valve springs. There was also a modified procedure for running the CCC versus the instructions on the label.

 

The link you sent is the 99-2001 Cherokee. When they switched them up a bit. The one I read was a defected valve spring that they had in production and switched out in 98. Was because of weak valve springs. But that is weird how all of these cause such a big problem.

 

Still misses. Didn't try the water for a second time yet. Valve sprigs are easy and I wi be doin that next weekend. Mine is a single misfire too.

 

Yeah all I did was replace the springs on cylinder 1. And it fixed the misfire

 

How difficult is it to replace the valve/valve spring with the head on the bench? Any special tools? Can the valve/valve springs be purchased individually from the dealer?

 

Easy with a valve spring compressor.

And I believe the dealer sells the springs individually.

 

correct

 

And you only need the exhaust valve springs?

No need to pull the head actually.

 

The TSB that applies to my '98 says to replace all 12 springs. I only replaced the 2 springs on the affected cylinder.

 

Cheapskate...

 

OK, guilty as charged!

 

Mornin.

Give that 4.0 a drink of water now. It's free.