No start after battery swap - Off-Road Forums & Discussion Groups
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post #1 of (permalink) Old 01-19-2004, 10:20 AM
Geno
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No start after battery swap

Situation: Saturday afternoon, Jeep ran great untill I left my lights on. Battery was ancient and wouldn't take a charge so I went and picked up an Optima red top today. Swapped the battery and all it does is crank. Checked everything I could think. Terminals are good, ground is solid, spark is OK, and fuel is reaching the cylenders. Thought my buddies might have screwed with my firing order but NOPE. The No.1 plug didn't seem as wet as it should so I pulled the line off the fuel rail and pleanty of gas came out. I did add injector cleaner with the last fill up (Outlaw brand). I'm stumped! The factory battery tie down wouldn't go back on but how the hell could that affect anything?
Back to the 25 degree snow coverd fun. Any ideas might save me from frost bite!
Thnks
Geno
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post #2 of (permalink) Old 01-19-2004, 12:03 PM
Journeyman
 
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Re: No start after battery swap

Look for a wire or vacume hose that might have become disconnected when you put in the new bat. Did you just leave the lights on or was the ignition on the whole time? Following is based on my experiance with an 89 MJ, it has an older FI setup then yours so keep that in mind.
On a FI motor you really need to measure fuel pressure to make sure that is OK. Finding gas at the fuel rail when you disconect it does not give you the whole picture. When you turn the key to on from the off position you should be able to hear the pump in the gas tank run for a second or two, this builds up pressure for starting then the system relies on other readings to see if it should continue pumping fuel (oil pressure for example). I really doubt leaving you lights on killed your fuel pump. I would guess something accidently got disconnected. If the 94 uses the same resister block thingy (sorry for getting technical) check that, make sure you have good connections! Good luck and do the simple stuff first.
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