jeep help

blackman · Nov 8, 2008

hey im working on a 88 jeep with the 4 liter in it it drove into the shop i pulled the engine and replaced it with a HO one and now it will not start... im not getting spark and have power to coil and distributor... replaced CPS .... but everything else is from the original motor... any ideas?

Avanteone · Nov 10, 2008

Did you reuse the renix flywheel/flexplate or did you use the HO unit?

blackman · Nov 10, 2008

the HO was a auto and the old motor was a manual so i used to orignal flywheel

Bunk1 · Nov 10, 2008

firewall ground? (my first thought)

Cascade_Crawler · Nov 10, 2008

blackman said:
the HO was a auto and the old motor was a manual so i used to orignal flywheel

The renix flywheels/flexplates have different markings on them and the CPS wont read the other style. This might be your issue, anyone confirm? I believe crash had a problem with this on a build he did...

NotMatt · Nov 10, 2008

If you're using the HO CPS and the Renix flywheel, that's your problem. You need an HO flywheel.

More details would help. Did you swap all the Renix intake/electronics onto an HO block, or are you actually converting the '88 to use the HO electronics?

Avanteone · Nov 10, 2008

Nailed that one on the first shot. :fawkdancesmiley:

NotMatt · Nov 10, 2008

Avanteone said:
Nailed that one on the first shot. :fawkdancesmiley:

Maybe :flipoff:

Hopefully he posts more details or lets us know he got it resolved.

blackman · Nov 10, 2008

i used all the oringial (for the 88) intake/sensors/wireing/flywheel and cps.. on the bare HO block. also i have a good firewall ground

THE ONLY H.O. PART IS THE BLOCK IT SELF..
thanks

Fullywrecked · Nov 10, 2008

He said he is using the original flywheel? I believe he means the one that came with the cherokee?:beer:

blackman · Nov 10, 2008

yes the flywheel and cps came on the jeep

crash2 · Nov 10, 2008

Cascade_Crawler said:
The renix flywheels/flexplates have different markings on them and the CPS wont read the other style. This might be your issue, anyone confirm? I believe crash had a problem with this on a build he did...

yes--yes I did. And when you compare both flywheel types--you can see a big difference...

blackman · Nov 10, 2008

but that should not be my problem because i am using a flywheel and cps that are from the same vehicle correct?

crash2 · Nov 10, 2008

blackman said:
but that should not be my problem because i am using a flywheel and cps that are from the same vehicle correct?

If thats the case that should not be the problem...

NotMatt · Nov 10, 2008

Yeah, that's not the problem. If you swapped all the RENIX stuff onto the HO block then you're good there.

I'm out of ideas. All the 4.0 Jeeps I've ever owned have run great with the exception of CPS problems.

boxboy · Nov 10, 2008

maybe a bad coil wire also take you distributer cap off and see if it is turning when you crank the engine over?

blackman · Nov 10, 2008

tryed two diffrent coil wires... and the dizzy is turning when you crank the motor over....

Avanteone · Nov 10, 2008

Damnit, misread that. hahahaha

Are you using the original crankshaft position sensor bolts? They're a special shouldered bolt and if not the airgap for CPS will be off.

Avanteone · Nov 10, 2008

Do you have fuel pump prime and fuel pressure?

blackman · Nov 10, 2008

i am using the original shouldered cps bolts. have not checked fuel pressure but can smell fuel when cranking and can hear the fuel pump turn on with key...