Long Crank Times....Info - Off-Road Forums & Discussion Groups
Jeep-Short Wheelbase All discussion of short wheelbase Jeeps: CJ, TJ, YJ and JK

 
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post #1 of (permalink) Old 06-17-2003, 02:39 PM
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Long Crank Times....Info

Guys, I think I'm onto something regarding long crank times if you have fuel injection.
On my Cherokee, I have to crank it for several seconds before it starts. According to my jeep expert, this is usually caused by low pressure in the fuel rail. The low pressure is caused by a leak somewhere that allows the pressure to bleed off. When you first start the engine, the fuel pump will run for a second or so and then stop. If your like me, you don't even give it a second, you just turn on the ignition and crank. In my case, I was cranking for 3-4 seconds.
To test the pressure idea, I turned on the ignition for a few seconds without cranking and then turned it off. I then turned it back on for a couple of seconds and then cranked. Started up after about 1 second. Another jeeper tried it and got the same results.
Now, I will try to find the cause of the pressure bleed down. I'll let you know what I find.
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post #2 of (permalink) Old 06-17-2003, 03:20 PM
 
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Re: Long Crank Times....Info

It's a common problem with the 4.0. You don't need to turn the key back off again before cranking, just turn to Run, wait a few seconds to let the fuel pump build up pressure, then crank. It will fire right up.
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