Newly Rebuilt! Now a big question - JeepForum.com
 
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post #1 of 6 Old 10-14-2012, 06:44 PM Thread Starter
jmaxey27
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Join Date: Oct 2011
Location: LaPorte
Posts: 91
Newly Rebuilt! Now a big question

I just finished installing the newly rebuilt 4.0 yesterday. It starts pretty easily but it is definitely having a bigger problem starting than before.

My guess is that because we bored thirty thousandths off the cylinders and also took quite a lot off the top of the block and bottom of the head it has a hell of a lot more compression than it did before. More horsepower? Who can argue with that?

I looked into a beefier started from Green Machine but I don't wanna drop $300+ when I just spent a fortune on the rebuild and various other fix-ups (including the heater-core. That sucked...)

Any ideas/suggestions/cheap upgrades?

Thanks in advance

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post #2 of 6 Old 10-14-2012, 10:17 PM
Armycherokee
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1992 XJ Cherokee 
 
Join Date: Apr 2012
Location: Athens
Posts: 253
How old is the starter you have now and can you prime the fuel system and it start better it could be a bad check valve in the fuel pump or maybe a bad fuel pressure regulator I would do a fuel pressure test with the engine off and see what psi it holds after shut down
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post #3 of 6 Old 10-14-2012, 11:35 PM
GetLifted
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1996 XJ Cherokee 
 
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Location: SoCal
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Did you swap distributors?
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post #4 of 6 Old 10-15-2012, 06:15 PM Thread Starter
jmaxey27
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Join Date: Oct 2011
Location: LaPorte
Posts: 91
Yeah. We used the old distributor and timed it correctly and whatnot. That was a cool thing to learn. I've never done that before but my uncle is an expert so he showed me how.

It doesn't have any problems starting... yet lol. I just feel that in the future it might start to become a problem. And I don't have $300 to blow on a Green Machine starter
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post #5 of 6 Old 10-15-2012, 11:34 PM
GetLifted
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1996 XJ Cherokee 
 
Join Date: Mar 2010
Location: SoCal
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You are positive its Indexed correctly? 100% sure??

I paid a mechanic 60$ to do it wrong 3 times before it was done right by someone that had done it on a 4.0 HO before. Just saying...though that "should" throw a P1391 code.
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post #6 of 6 Old 10-16-2012, 06:37 AM
whitexj98
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1998 XJ Cherokee 
 
Join Date: Jul 2011
Location: Sterling Heights
Posts: 814
Fully charged battery? Good clean power and ground? Side note, did you measure what the CR is to see what octane you will need?

98 XJ lifted/Locked/Geared
My Build: http://www.jeepforum.com/forum/f177/my-98-build-1253511/
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