4.0 liter
 

I just bought a parts donor XJ, and it has what is supposedly a
"remanufactured" engine with low miles. When I attempt to crank it, it
will fire, run VERY poorly and quit. It seems that the timing is way
off.
So here is what I know:
1. Plug wires are right.
2. Distributer is approximately right.
3. Ignition parts are new

Heres what I am thinking:
1. Maybe it never really was right - (Seller lied about it running in
previous jeep?)
2. Maybe the engine doesn't match the '88 modules and sensors (Did
OBDII change crank sensor location or flywheel?)
3. Maybe the cam timing was put together wrong.
4. Is there some way the shadetree got the flywheel on wrong?

I will check spark timing with the light, as soon as I figure out which
of my worthless friends borrowed my timing light. ANY IDEAS???

Re: 4.0 liter
 

The 88 has the renix computer system. After 91 or so they changed to
the Chrysler system. Not much is compatible between them....

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
Canadian Off Road Trips Photos: Non members can still view!
Jan/06 http://www.imagestation.com/album/pi...?id=2115147590
(More Off Road album links at bottom of the view page)


sparenzap wrote:
>
> I just bought a parts donor XJ, and it has what is supposedly a
> "remanufactured" engine with low miles. When I attempt to crank it, it
> will fire, run VERY poorly and quit. It seems that the timing is way
> off.
> So here is what I know:
> 1. Plug wires are right.
> 2. Distributer is approximately right.
> 3. Ignition parts are new
>
> Heres what I am thinking:
> 1. Maybe it never really was right - (Seller lied about it running in
> previous jeep?)
> 2. Maybe the engine doesn't match the '88 modules and sensors (Did
> OBDII change crank sensor location or flywheel?)
> 3. Maybe the cam timing was put together wrong.
> 4. Is there some way the shadetree got the flywheel on wrong?
>
> I will check spark timing with the light, as soon as I figure out which
> of my worthless friends borrowed my timing light. ANY IDEAS???

Re: 4.0 liter
 

The 88 has the renix computer system. After 91 or so they changed to
the Chrysler system. Not much is compatible between them....

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
Canadian Off Road Trips Photos: Non members can still view!
Jan/06 http://www.imagestation.com/album/pi...?id=2115147590
(More Off Road album links at bottom of the view page)


sparenzap wrote:
>
> I just bought a parts donor XJ, and it has what is supposedly a
> "remanufactured" engine with low miles. When I attempt to crank it, it
> will fire, run VERY poorly and quit. It seems that the timing is way
> off.
> So here is what I know:
> 1. Plug wires are right.
> 2. Distributer is approximately right.
> 3. Ignition parts are new
>
> Heres what I am thinking:
> 1. Maybe it never really was right - (Seller lied about it running in
> previous jeep?)
> 2. Maybe the engine doesn't match the '88 modules and sensors (Did
> OBDII change crank sensor location or flywheel?)
> 3. Maybe the cam timing was put together wrong.
> 4. Is there some way the shadetree got the flywheel on wrong?
>
> I will check spark timing with the light, as soon as I figure out which
> of my worthless friends borrowed my timing light. ANY IDEAS???

Re: 4.0 liter
 

The 88 has the renix computer system. After 91 or so they changed to
the Chrysler system. Not much is compatible between them....

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
Canadian Off Road Trips Photos: Non members can still view!
Jan/06 http://www.imagestation.com/album/pi...?id=2115147590
(More Off Road album links at bottom of the view page)


sparenzap wrote:
>
> I just bought a parts donor XJ, and it has what is supposedly a
> "remanufactured" engine with low miles. When I attempt to crank it, it
> will fire, run VERY poorly and quit. It seems that the timing is way
> off.
> So here is what I know:
> 1. Plug wires are right.
> 2. Distributer is approximately right.
> 3. Ignition parts are new
>
> Heres what I am thinking:
> 1. Maybe it never really was right - (Seller lied about it running in
> previous jeep?)
> 2. Maybe the engine doesn't match the '88 modules and sensors (Did
> OBDII change crank sensor location or flywheel?)
> 3. Maybe the cam timing was put together wrong.
> 4. Is there some way the shadetree got the flywheel on wrong?
>
> I will check spark timing with the light, as soon as I figure out which
> of my worthless friends borrowed my timing light. ANY IDEAS???