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1999 Jeep Wrangler

Tiny
KAJO0301
  • MEMBER
  • 1999 JEEP WRANGLER
When I try to start my jeep it trys to start and then I turn the key off and try it again and it starts right up? I changed the battery thinking that may be it, but to no avail. Whats up?
Sunday, June 3rd, 2007 AT 6:35 PM

7 Replies

Tiny
SERVICE WRITER
  • MECHANIC
  • 9,123 POSTS
Sounds like the fuel pump is allowing the fuel to drain back into the tank. Is the no start when it has sat for several hours?
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Thursday, September 24th, 2020 AT 6:16 PM
Tiny
KAJO0301
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Hi Paul, thanks.
Sorry i'm new to this, my jeep is a 1999 Jeep wrangler 104,000 miles, and its a manual 4.0L.

Yeah, the no start definately happens when it has been sitting, but it also does it when it hasn't sat for a very long time, however, when it hasn't sat for an extreme amount of time it is a quicker start. Also, when I turn of the jeep and try starting it right away it starts right up.
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Thursday, September 24th, 2020 AT 6:16 PM
Tiny
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What I think is happening I mentioned. I would anticipate a fuel pump on it. These are a fuel pump, filter and module assy. Eventually you will get a no start if I'm right. Get it from the dealer.
Until you address it, you can turn the ignition key to the run position for a few seconds and back tht off position and back to the run again, several times to get fuel up to the motor, instead of wearing down the starter.


https://www.2carpros.com/forum/automotive_pictures/30961_99jeep_1.jpg


.
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Thursday, September 24th, 2020 AT 6:16 PM
Tiny
KAJO0301
  • MEMBER
  • 4 POSTS
If i'm not mistaken, isn't there a sensor on the starter that recieves a signal from the ignition to "start"? Is it possible one of them is partially faulty?
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Thursday, September 24th, 2020 AT 6:16 PM
Tiny
SERVICE WRITER
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Before we go down another path, try the key cycling like I mentioned. Let me know if it makes sense what I described. Try it for a few days, if it consistently starts up after the key cycling procedure let me know.

While there is not a sensor on the starter, there are inputs to the pcm that dictate power to the pump as well as the ignition spark control.
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Thursday, September 24th, 2020 AT 6:16 PM
Tiny
KAJO0301
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  • 4 POSTS
Turning the key to ON and then back to OFF a few times works everytime, I can actually even here the pump when I turn the key to ON. So that will have to work for now. What does the cost and hassle to get that fixed look like?
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Thursday, September 24th, 2020 AT 6:16 PM
Tiny
SERVICE WRITER
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You need a fuel pump module. You'll want to get this from chrysler. The tank has to be dropped to do it. Not sure on the cost, $500.00?
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Thursday, September 24th, 2020 AT 6:16 PM

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