93 yj not starting and 4wd not engaging fixed, thanks - Jeep Wrangler Forum

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Old 02-14-2010, 01:12 PM   #1
Join Date: Feb 2010
Posts: 2
93 yj not starting and 4wd not engaging fixed, thanks

I had trouble with 93 yj not starting. had spark but seemed to be no fuel. the only codes were 11,33, and 55. I saw on here that the fuel pump should run about 2 seconds when key comes on and it was not. Also read that sometimes you have to cycle the key on and off OR just leave the key on for a few minutes and it would start running the pump.
I went out after reading all that and left key on for about two minutes, then cycled off and on and the fuel pump came on. I cycled the pump about 4 or 5 times to build pressure on the fuel rail, came up to about 40 psi, and it started right up.
I wonder if that has been an issue in the past, when we would not run the jeep for months at a time and when we would start it, the engine would just turn over for a long time before starting.

Also on a separate issue the 4wd would not engage. I found the vacuum motor shaft was struck, took it apart and cleaned and regreased. Also found the vacuum connector had a hole rubbed in it from the top. The hole, oddly enough, was caused by the rubber cover that is supposed to be a splash guard for the vacuum motor. The connector "rubs" right up next to the guard.

Seems to be all good now.
Thanks for the great posts on this site.


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Old 02-14-2010, 04:05 PM   #2

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scott howard's Avatar
Join Date: Dec 2009
Location: wichita falls texas
Posts: 1,035
check you fuel pump relay and make sure the prongs are clean.
and you might get lucky and never have the problem again.

the 4x4 frt diff problem is a very easy and free fix . just do the bypass and be done with it.
i have had no problems with mine and have lost no mpg either.

here is a link to read and pics to see how.

scott howard

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Old 02-14-2010, 08:45 PM   #3
Join Date: Feb 2010
Posts: 2
Actually it is all good now.

I looked at doing the bypass before but decided to keep it stock.
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fuel starting 4wd engage

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