Rpm jump
#1
Junior Member
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Rpm jump
So just drive about 15 miles to school and it's about 58f out rn first chilly day this year and I was sitting in the parking lot and all of a sudden the jeep starts revving out to about 1800 rpm it did that for about 30 seconds then I turned it off, I waited a little while then turned it back on and it turns over and starts at about 2k rpm then I heard a loud pop and it has gone back to its normal at about 900rpm. What could have caused the jump. 1996 xj country 240k on engine...
#3
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hmm good to know but this is the first time it's done it... But there is a first for everything. Now I did here a loud pop and it sound like somthing fell out of the engine bay, I checked and found nothing. -edit- also what's the best way to check for a leak
Last edited by JakeTRS; 09-30-2016 at 05:21 AM.
#4
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#5
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Join Date: Feb 2011
Location: Ocala, Florida
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Year: 1998
Model: Cherokee
Engine: 4.0
#6
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#7
Beach Bum
If the crush/dent you are referring to is in the downpipe of exhaust, that it is supposed to be there. Something about bringing the catalytic converter up to operating temp faster.
A thorough visual inspection with a good light is always a good idea.
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#8
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I was referring to intake manifold, however if exhaust manifold is cracked than air will be let in (and exhaust out). This causes the O2 sensor to read lean and increase fuel flow unnecessarily. If the crush/dent you are referring to is in the downpipe of exhaust, that it is supposed to be there. Something about bringing the catalytic converter up to operating temp faster. A thorough visual inspection with a good light is always a good idea.
It dosnt look that bad on camera but it's a nice dent
#9
Beach Bum
The pic you posted looks to be freshly scratched or impacted. Did the driveshaft knuckle contact exhaust?
Attached is a picture of the factory dent I was referring to. Located just beyond exhaust header, in top portion of downtube.
Attached is a picture of the factory dent I was referring to. Located just beyond exhaust header, in top portion of downtube.
#10
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Well I found out my 13 year old brother took a joy ride the night before.... That might explain that, someone's going to get a a$$ whooping when I get home
#11
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