Set Ignition Timing?? - Page 2 -
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Unread 02-24-2013, 12:04 AM   #16
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1998 TJ Wrangler 
Join Date: Jun 2012
Location: Pasadena, CA
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Hahaha screw you Reptile! But I had the rough idle before testing the alternator. I've been betting on the MAP sensor as well. I'll test it tomorrow.

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Unread 02-24-2013, 12:19 AM   #17
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1991 XJ Cherokee 
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Unread 02-24-2013, 07:58 AM   #18
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1995 XJ Cherokee 
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I had the same tiing. Only rough at idle and at cold start it was fine 'till it changed loops. Did all the same stuff you have done. Tested the MAP sensor and it was good but decided to put one on anyway. Took 85% of the rough out of it. I addea octane booster to the mix and no it is as smooth as it should be. Just remember though, no I6 idles smooth as glass.

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Unread 02-25-2013, 09:48 PM   #19
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1993 XJ Cherokee 
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Originally Posted by cruiser54 View Post
Timing being off does not cause rough running. It's a term that gets thrown out there, mostly by those ignorant of how engines work.

Vacuum leaks been checked? Intake manifold bolts loose? Throttle body and IAC been cleaned? CCV hoses and piping clear and clean?
think crusier54 may be on to something with the manifold bolts. I had a new 85 cherokee that exibited a rough idle. It would change idle when hot vs cold. It was eventually traced to a bad intake manifold seal ( i dont know if it really had a gasket in it. per the dealer.) I changed everything to fix it and finally left it at the dealer. After 3 days, i got a call to pick it up. It was the smoothest running engine I had ever seen. ( had to always give it gass to get it to run.) The dealer had removed and reinstalled the intake manifold.
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