Timing issues. Bad ECU??

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Feb 10, 2016 | 05:22 PM

chiefxj85

Thread Starter

Newbie

Joined: Jan 2016

Posts: 5

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From: Nebraska

Year: 1985

Model: Cherokee

Engine: 4.0

Timing issues. Bad ECU??

I have a 85 xj with a 95 yj 4.0 ax15 transmission. Im having some timing issues. When the jeeps at idle the timing is 27 degrees before TDC but once the throttle is applied its 15 degrees after TDC.
I need ideas ive been struggling with this for a little over five months now.

Thanks

Feb 10, 2016 | 06:55 PM

Jeep Driver

Banned

Joined: Jan 2014

Posts: 1,054

Likes: 4

Model: Cherokee

Complete harness swap???

85 didn't come 4.0............so.................what did you do?

Feb 10, 2016 | 07:02 PM

chiefxj85

Thread Starter

Newbie

Joined: Jan 2016

Posts: 5

Likes: 0

From: Nebraska

Year: 1985

Model: Cherokee

Engine: 4.0

Quote:

Originally Posted by Jeep Driver

Complete harness swap???

85 didn't come 4.0............so.................what did you do?

It was a complete swap. The motor, wiring, and transmission came out of a 95 yj. The jeep was running fine one day, than just took a crap timings all messed up cant figure out why.