Knocking noise on startup.
10-01-2012, 11:54 AM
#1
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Year: 1998
Model: Cherokee
Engine: 4.0L
Knocking noise on startup.
Just recently I've noticed a loud knocking noise on initial start up. After allowing it to run a while, and restarting it, the noise is all but gone. But, once started, it runs/idles fine, with no noticeable difference from before I noticed the noise. Really kinda pissing me off, because I just did an oil change on Friday. Gonna get underneath the ole girl and see if I notice anything out of the ordinary, but thought I'd come here for some suggestions on what to look for.
10-01-2012, 12:02 PM
#3
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Shouldn't. How much oil did you put in it?
What's the oil pressure at start up?
Is there oil still in it?
Is the exhaust banging on the cross member?
What's the oil pressure at start up?
Is there oil still in it?
Is the exhaust banging on the cross member?
10-01-2012, 12:20 PM
#4
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Year: 1998
Model: Cherokee
Engine: 4.0L
Holy crap.......
I did overfill it.....
I've taken some out and the noise is still there, but quieter.....
Oil pressure on start up is about 37-38
And yes, there's still oil in it lol
And I didn't happen to notice the exhaust while I was down there, but it doesn't seem like that would be it. The noise is definitely coming form the front.
I did overfill it.....
I've taken some out and the noise is still there, but quieter.....
Oil pressure on start up is about 37-38
And yes, there's still oil in it lol
And I didn't happen to notice the exhaust while I was down there, but it doesn't seem like that would be it. The noise is definitely coming form the front.
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10-01-2012, 02:21 PM
#9
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Year: 1998
Model: Cherokee
Engine: 4.0
Your timing chain probably has some slack in it. Mine makes a sound kinda like a knock from the front. It's been like that for the better part of a year.
10-01-2012, 02:25 PM
#10
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Year: 1989
Model: Cherokee
Engine: 4.0L
Oil preasure doesn't mean every part has oil. It just means the sensor has oil. I'm not saying it is, but if it's some parts banging because of lack of oil I would definitely recommend not revving your engine when first starting.
10-01-2012, 04:30 PM
#11
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Year: 1990
Model: Cherokee (XJ)
Engine: 4.0
First off, what brand of oil filter is on the Jeep?
10-01-2012, 06:48 PM
#14
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Year: 1990
Model: Cherokee (XJ)
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If it were mine, and knowing what I know, the very first thing Iwould do is replace the oil filter with a Wix or Napa Gold.
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