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Unread 03-08-2010, 03:22 PM   #1
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2006 LJ Wrangler 
Join Date: Apr 2004
Location: Central PA
Posts: 98
What other parts to replace?

94 YJ 2.5L. About 40k on new motor. Sporadically will NOT start. Turns over fine, fuel at rail at proper pressure, compression good on all 4 cyl. New coil, plugs, wires, distributer, coil pickup, correct voltage to coil from ecm when cranking. Checked sensor in bell housing, passes chilton's manual test. When it runs, it is perfect (for a 2.5 anyhow). I went to leave work, turned over but wouldn't start. Walked home, got truck, returned to work to pick up stuff (maybe 15 minutes later), just for hell of it, tried the key and the jeep started right up. Can't duplicate when it is at garage, have had 3 different mechanics work on it, no codes on computer. Completely random, has done it when dry, wet, hot, cold, etc. No pattern that I can find. Any suggestions?

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Unread 03-08-2010, 04:53 PM   #2
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1994 YJ Wrangler 
Join Date: Dec 2008
Location: mn
Posts: 1,477
Could be that the CPS connector is intermittant. Used to have that problem on my kids comanche. Wound up just cutting off the plugs and soldering it. Never had a problem after that.
Chuck P
94 YJ 2.5L/AW4 (Gone)
98 ZJ Limited 5.2 - sons car
97 TJ 2.5L/30RH - daughters car

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Unread 03-08-2010, 05:15 PM   #3
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1991 YJ Wrangler 
Join Date: Apr 2008
Location: Meridian, Idaho
Posts: 2,554
When this problem presents it'self,... when the ignition is first turned on, and before you go to start... Does the CEL lamp come on? It should, which would mean the ECM is powered up and then in-turn the fuel pump and ASD relay. If the CEL lamp does not light when the ign is first turned on, then likely you have bad capacitors in the ECM and it is easily/cheaply fixed. If the CEL does not initially light, will it do so if you what a spell?
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