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my 1st rebuild

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Old 10-21-2013, 09:44 PM
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Default my 1st rebuild

alright everybody. I've tinkered with cars my whole life and was ready for a challenge. My 98 XJ engine blew so I went to a wrecking yard and bought a wrecked 4.0. Took it apart and off to the machine shop. So, here I am with a motor I built, I got it in and guess what??? It starts and sounds great! Only problem is that it won't idle. As soon as I let of the gas it just dies. If I rev it up it sputters. So, did I mess up the timing or do I have some other issue? Help, the new builder may have not really been ready.
Old 10-21-2013, 09:45 PM
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Well, I should say it sounds great at 2K rpm. Rev it up and it sputters and cuts out, let off the gas and it just dies.
Old 10-21-2013, 09:49 PM
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Map sensor from the sounds of it
Old 10-21-2013, 10:24 PM
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Vacuum leak, IAC & TPS hooked up/functioning?
Old 10-22-2013, 07:10 AM
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After doing a headgasket job on my XJ for a long time i had this same problem , mine turned out the battery was bad just throwing it out there! lol
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