XJ running badly.

[Tyvokka]

Sorry the fpr didnt fix it. Have you looked atthe pcv valve. If there was a leak there, you'd get rough running too

[Billnick]

Have you established whether its definitely spark or fuel? If she's revving at 4000rpm, a spark issue would cause a definite miss and the car will jerk, whereas a fuel problem will be less severe, losing power rather than missing completely.
I've said this before and is cheap to do, is buy a timing light and put it on the coil output. I personally think it is the CPS and you need to obtain a 3rd one. You wouldn't get 3 wrong surly.

You call your Jeep a HEEP! Maybe that's the problem, Jeep's have feelings you know.

[East-Gippsland-XJCherokee]

Originally Posted by rustynuts

What about the cam sensor in the distributor? I know we are clutching at straws. Bad sensors should store a code so prob. try that first.

New one was installed a few weeks ago, just forgot to mention it as I have installed and replaced so many things.

[East-Gippsland-XJCherokee]

Originally Posted by Billnick

Have you established whether its definitely spark or fuel? If she's revving at 4000rpm, a spark issue would cause a definite miss and the car will jerk, whereas a fuel problem will be less severe, losing power rather than missing completely.
I've said this before and is cheap to do, is buy a timing light and put it on the coil output. I personally think it is the CPS and you need to obtain a 3rd one. You wouldn't get 3 wrong surly.

You call your Jeep a HEEP! Maybe that's the problem, Jeep's have feelings you know.

Sure I have no problem buying a second OEM CPS as even if that is not the problem I don't mind having a spare, I did not buy 3, I bought 1 a year ago and thats the one that does not run really well, the other one is the one thats on the car and is still there now. I have a timing light in the garage somewhere, and what would I check with it?

But please shed some light on putting a timing light and put it on the coil output. Did I mention I replaced the coil as well!

[East-Gippsland-XJCherokee]

Originally Posted by Tyvokka

Sorry the fpr didnt fix it. Have you looked atthe pcv valve. If there was a leak there, you'd get rough running too

Yeah looked at, cleaned and inspected, and also was part of checking for vacuum leaks whilst running.

[Big Dave]

I did read through all the posts a while ago but didn't see if you had removed & thoroughly cleaned the throttle body. Mine was missing similarly to your years ago and the clean is all that was needed.

[oldon]

Originally Posted by East-Gippsland-XJCherokee

This is like the one I bought a year ago, and did not work with my Heep, plugs in under the dash powers up but goes no where after that. http://www.ebay.com.au/itm/Car-Engin...8AAOSwd4tT7DR9

I have one of those too, doesn't work on xj or au falcon, works on wifes focus.