Anyone else's 4.0 knock?
#1
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Year: 1993
Model: Cherokee
Engine: 4.0
Anyone else's 4.0 knock?
Curious if anyone else's 4.0 knocks like a jehova until it is completely warmed up?? Mine chatters/knocks like a diesel, but after driving for 20-30 minutes it gets considerably quieter. Still a bit noisy at temp, but not nearly as bad.
Oil pressure is perfect, running 10w30 oil.
Thoughts/Opinions??
After watching a few youtube video's to show what im talking about, I came across this one. Sounds 100% identicle to mine..
Skip to 1.40
She's got 170,000 miles on her. Good for 100k more? Lol
Oil pressure is perfect, running 10w30 oil.
Thoughts/Opinions??
After watching a few youtube video's to show what im talking about, I came across this one. Sounds 100% identicle to mine..
Skip to 1.40
She's got 170,000 miles on her. Good for 100k more? Lol
#4
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Year: 1994
Model: Cherokee
Engine: 4.0
most 4.0s have lifter tick, also another area very likely could be the exhaust manifold, the heat makes it expand so thats why you only hear it when its cold.
#5
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Year: 99
Model: Cherokee
Engine: 4.0
@ about 1:18 he clutches it, no change.
could be sticky lifter/s have you tried sea foam in the manifold via break master cylinder vac hose? that can do wonders.. just get the hose off, keep rpms steady around 3k and pour about 1/3 a can in slowly. cheap and easy. it doesnt sound like a flexplate issue, which is also pretty common.
could be sticky lifter/s have you tried sea foam in the manifold via break master cylinder vac hose? that can do wonders.. just get the hose off, keep rpms steady around 3k and pour about 1/3 a can in slowly. cheap and easy. it doesnt sound like a flexplate issue, which is also pretty common.
Last edited by VTJeep; 07-03-2013 at 08:29 AM.
#6
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Year: 1994
Model: Cherokee
Engine: 4.0 L/242 CID I-6 High Output MFI
Mine does pretty much the same thing. Has been for 50k miles, with 216k on the clock. It does sound like a small diesel engine... I think it's just valvetrain noise, but it could be something more serious.
#7
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Year: 1997, 1993
Model: Cherokee
Engine: 4.0L
Rotella 15-40 and a quality filter (not fram) are your friend.
Pretty much all 4.0's have some amount of piston slap which along with noisy lifters makes our engines sound very diesel like.
Pretty much all 4.0's have some amount of piston slap which along with noisy lifters makes our engines sound very diesel like.
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#13
I would put a 0w-30 or 5w30 in my 2001 SilverStone Metallic XJs 65,212 mile 4.0 with confedence, but not in my 87s 297,518 mile 4.0, I use HD30 or 10w-40, Diesel 15w-40 oils in her original 1st year 4.0
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