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  #1  
Old February 6th, 2018, 18:23
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alexgalexg alexgalexg is offline
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Strange reverse light behavior

So I have been noticing that my reverse lights don't work when I first use the jeep. Once it's warm and I have been driving a bit they come on any time I put it in reverse. But the past couple months I noticed they don't come on after it's been sitting for hours. I also notice a burnt oily smell but I think that's because the power steering gear box leaks and the oil may be hitting something hot.
This is a 1998 Xj. 196k on the body and tranny. Did an engine swap in August 2016.

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  #2  
Old February 6th, 2018, 20:22
RCP Phx RCP Phx is offline
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Re: Strange reverse light behavior

Clean the NSS !
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  #3  
Old February 6th, 2018, 21:48
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Green Mesa XJ Green Mesa XJ is offline
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Strange reverse light behavior

Yer as RCP Phx said it the neutral safety switch.
Here is a video on it, I have t watched it just the first video that looks right in a search

https://m.youtube.com/watch?v=70m0Pu6ZJ_0

These 4.0 like to leak oil, easily be valve cover, oil filter adapter or any number of seals starting to leak.


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  #4  
Old February 6th, 2018, 21:51
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Green Mesa XJ Green Mesa XJ is offline
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Strange reverse light behavior

Well I canít edit the post in app to fix spelling. Trying to say yep RCP Phx is right, and you can replace it as well, but itís not hard repair it by cleaning the contacts. Further down the line it can lead to no start situations.


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  #5  
Old February 7th, 2018, 05:12
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alexgalexg alexgalexg is offline
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Strange reverse light behavior

Thanks all of You!

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  #6  
Old May 14th, 2018, 18:50
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Strange reverse light behavior

Can the NSs cause a rough start? Today I started my xj and it started for like a sec and died. I started it again and it fired right up business as usual. Every once in a while it takes s minute to start after sitting overnight. Never any issues running and it's not always. Doesn't seem to be a fuel issue and since it's only on cold starts not seeming like CPS either

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Old May 15th, 2018, 05:39
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Re: Strange reverse light behavior

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Originally Posted by alexgalexg View Post
Can the NSs cause a rough start? Today I started my xj and it started for like a sec and died. I started it again and it fired right up business as usual. Every once in a while it takes s minute to start after sitting overnight. Never any issues running and it's not always. Doesn't seem to be a fuel issue and since it's only on cold starts not seeming like CPS either

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Nah.

When's the last time you cleaned your throttle body and IAC?
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Old May 15th, 2018, 06:06
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Strange reverse light behavior

Throttle body is done at least once per year as result of a heavy seafoam treatment (gas in ct has a ton of ethanol) but have not done the iac. That's a good place to start

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Old May 15th, 2018, 06:07
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Strange reverse light behavior

Would you recommend cleaning or just replacing that part

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Old May 15th, 2018, 07:07
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Re: Strange reverse light behavior

2 things. No fuel goes through the throttle body so seafoam in the tank is doing it no good.

Clean the throttle body and IAC. best to remove it. get a new gasket beforehand.
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Old May 16th, 2018, 05:59
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Re: Strange reverse light behavior

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2 things. No fuel goes through the throttle body so seafoam in the tank is doing it no good.

Clean the throttle body and IAC. best to remove it. get a new gasket beforehand.
Well no I use seafoam through the throttle body. You let the engine idle and pour it in until half the bottle has been poured and then you let the engine sit off for 30 mins. Then you start it and go for a ride spending as much time at 2k revs. Cleans the intake, throttle body, piston heads and valves. But totally removing the throttle body is a good idea I will have to get a gasket

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Old May 16th, 2018, 06:05
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Re: Strange reverse light behavior

It needs to be manually cleaned with an old toothbrush.
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Old May 16th, 2018, 06:07
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Re: Strange reverse light behavior

And if you really want to remove carbon deposits in the combustion chamber and tops of pistons, do this. way cheaper.

https://www.cherokeeforum.com/f30/st...-4-0-a-226299/
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  #14  
Old May 19th, 2018, 21:33
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Re: Strange reverse light behavior

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And if you really want to remove carbon deposits in the combustion chamber and tops of pistons, do this. way cheaper.

https://www.cherokeeforum.com/f30/st...-4-0-a-226299/
Tops of cylinders still mostly sparkly gold. Did cylinder head swap in December and. The rebuild is on youtube as well. As for the iac it does run so much smoother after cleaning it. Also removing the entire throttle body tomorrow and cleaning it. However so far the late start is still not starting as nicely as it should. Likely unrelated to this thread but I'll update if I ever figure it out as a conclusion

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  #15  
Old May 20th, 2018, 07:46
trippled trippled is offline
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Re: Strange reverse light behavior

I would put a fuel pressure gauge on it before you start it cold next time.it could be bleeding some pressure off or slow to build. Or you can verify it's not the fuel pump.
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