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post #1 of (permalink) Old 09-12-2002, 05:26 PM Thread Starter
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4.0L Valve Rattle @ low rpms

Yes, it the paraniod guy again!

I know that my tranny is supposed to rattle (though I don't like it).

I have also noticed that since I bought the Jeep, low rpm engine effort causes valve rattling. Example: I'm on a hill maintaining speed and my rpms are 1100. The valves rattle like my 25 year old 304.

Now, is it supposed to do that? What would cause valve rattle in a 2002 Jeep TJ with fully electronic ignition?

Any opinions?

Fritz
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post #2 of (permalink) Old 09-12-2002, 06:49 PM
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Re: 4.0L Valve Rattle @ low rpms

Only on a hill?

1. Walking cam.
2. Collapsing Valves.
3. Low oil pressure.
4. Bad oil pump.
5. Clogged gallies to the Head.
6. Clogging oil filter.
7. Oil pump sump siphon fell off....
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post #3 of (permalink) Old 09-12-2002, 09:08 PM Thread Starter
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Re: 4.0L Valve Rattle @ low rpms

It happens mostly when lugging the engine (which happens most on a hill).

This engine has only 10,000 miles on it and has been doing this since day one. Does this sound kosher?

Would fuel injection cause this?

Thanks
Fritz
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post #4 of (permalink) Old 09-12-2002, 09:25 PM
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Re: 4.0L Valve Rattle @ low rpms *DELETED*

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post #5 of (permalink) Old 09-12-2002, 09:30 PM Thread Starter
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Re: 4.0L Valve Rattle @ low rpms

LEVE,

You'll love this. Its factory new, 2002 Jeep TJ that I bought with 11 miles on the clock in April. It has been doing this since then. I can distinguish it from the tranny rattle because I know what valve rattle sounds like curtesy of my old CJ.

So if I'm reading this correctly, it shouldn't do this at all? Its not some "acceptable noise" that the factory intended?

Thanks. Anymore input to use when I call the dealer is welcome. SO far my first adventure into new car world has been annoying, but the 100,000 powertrain warrenty is beginning to feel like it was a good choice afterall.

Fritz
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post #6 of (permalink) Old 09-12-2002, 09:44 PM
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Re: 4.0L Valve Rattle @ low rpms

Sorry about the above post... it was in answer to another post. As I often do... I got a little "mixed up."

1. It should not rattle.
2. It shoud be quiet!
3. Try (don't tell the Dealer) changing oil to a 50 weight to see if it quiets the valves.
4. If ALL the valves are making noise I'b be betting on:
a. Flat Cam, or
b. Poor Oil pressure causing lifters to empty under execssive load.
d. Possible Bad Computer causing the timing to advance too far underload.
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post #7 of (permalink) Old 09-12-2002, 09:53 PM Thread Starter
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Re: 4.0L Valve Rattle @ low rpms

Sounds like a plan.

I don't know if this helps, but the rattle goes away immediately if I give it more gas so that it goes up a few more rpms, or drop to a lower gear.

It is not present at idle, nor acceleration, or decceleration. It is only audible when the engine has to produce low end torque.

Thanks LEVE,

Fritz
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