Vacuum Leak Maybe?? Please, Please, Pleeeease Help!! - Jeep Wrangler Forum

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Old 07-14-2007, 01:36 PM
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Vacuum Leak Maybe?? Please, Please, Pleeeease Help!!

Yesterday I got in the jeep and cranked it up and noticed that all the radio stations had been reset as if the battery had been disconnected. Also, at that same time the engine started having a slightly high rev of about 1500-2000 RPM and wouldn't drop until I sat still for a minute and only then would it drop to around 800-1000 RPM. It did it all afternoon while I was out running errands.

I let is sit for the night and when I cranked it this morning to go to work the same high rev started again, this time the stations had not reset though.

It sat in the garage while I was at work for about 12 hours. Cranked it up to come home and no high rev anymore, actually the rev was kinda low, around 400-500 and this time the radio stations had reset again. Got home and inspected all the lines and hoses going to and from the intake and manifold and nothing looked cracked or loose. However, when I was under the hood with it running I could hear a ticking type noise that sounded like it was coming from around the manifold area. I turned it off and came in to do alot of searching on the forums and did find some possible routes to take, but nothing specific to the multiple odd problems I have going on all of the sudden. I went back out and was going to crank it again to try and locate the exact location of the ticking noise and it wouldn't hardly crank. I had to actually pump the gas peddle for it to crank which I heard with fuel injected I should not have to do this.

Other than this list I have here, the jeep ran fine coming home from work which was about 8 miles on the highway.

Also, I went to AutoZone to get the battery checked, it's fine.
It did throw a code though:
1)Fuel Level Sending Unit Defective
2)Check connectors and wiring

The radio being reset everytime I crank it in combination with the odd idle it what I don't get....

I can't see the Fuel Level Sending Unit causing these other symptoms. The reason why I say this is because my gas gauge hasn't worked for a few years now. I figure how much gas I have left by checking the milage.

Plus I'm gonna take the TB apart and clean it and all the sensors again like I just did a few months back.

I'm sorry for the long post but all these problems has got my head pretty boggled and I'm wondering if they could all be related or do I have a few areas to address?!?!?! Any help would be really appreciated.

98'TJ__2.5__33x12.5 ProComp Xtreme MT__3"BL<<(yea yea, i know)__Stock Suspension for now
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Old 07-14-2007, 01:54 PM   #2
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Check the fuses. If it is an aftermarket radio the installer might have tapped into a bad spot, and if it is factory you might have a chaffed wire that has affected both. Start at the fuse block and work back from there. Also check all your grounds, a bad ground will do strange things. You should probably get a wiring diagram to narrow down the circuits also.

Hope it leads you in the right direction. Good luck

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Old 07-14-2007, 08:19 PM   #3
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You don't have a vacuum leak, you have an electrical problem. Loss of power to the computer memory is most likely the cause of the high idle, computer has to relearn the correct idle speed.

I would take a good look at all the grounds and esp. the cables on the battery. Loose, corroded cables can lead to electrical problems.
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Old 07-14-2007, 11:50 PM
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I checked my wires going to the battery, the ground was pretty corroded and was loose so I took care of that. While I had the cables off the battery I took off the TB and checked and cleaned everything on there. Also, I removed the TB Spacer I had on, just because I've been wanting to lately since I hated the whistle is made. Got everything put back together and she fired right up. Actually had a pretty strong start, no hesitation or abnormal rev. Went for a little test drive and everything seemed fine. Got back home, turned it off and figured I would fire it up again just to see if the problem was really fixed....NO, it's not. When I turned the key over, it clicked for a split second and then cranked up, only to have reset the radio again(I had set a couple of stations while on the test drive just for this reason), plus the CEL is on now. I definitely agree that it is an electrical problem, I just need to find the wiring diagram that was mentioned. Anyone know where I could find one for my 98' TJ?? Thanks for the feedback btw, atleast now I know that it's probably not the TPS or IAC that was mentioned by someone else.

Oh yea, I tried to do the turn key on, off, on, off, on off, on method and it didn't blink for me at all to give me a code.

I actually just found a diagram so I'll do some checking and be back with an update when I find out something. Thanks again very much!!
98'TJ__2.5__33x12.5 ProComp Xtreme MT__3"BL<<(yea yea, i know)__Stock Suspension for now
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Old 07-17-2007, 10:09 AM   #5
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I have the exactly same problem,radio resets,funny rpms,etc,but my jeep doesn't give me any code,and some times my lights are flickering,and also my volt gauge goes all the way up ,and i have to shut off the engine and turn in on back again to put it at normal charge,and the funny thing that it is not always it can happen once a month or the whole week,it is drive me crazy but i start tu used to too,I have no time to check the whole wiring,but im taking vacation in a couple weeks so I can put al that time trying to fix that.
Any update will be great.
I will update post updates if I find something too.
Btw mine is a 2000 Sahara with 103k. miles with aftermarket stereo, and everything happens days after I changed the stereo,maybe it is just a coincidence.
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