Sinking Creek 4WD Association

Hey guys, I thought this would be another really good place to ask a few questions.

In my 04 Grand with 4.0 on cold start ups it will make a clicking/tapping noise for about 10-20 seconds and then go away. It sounds like it is the lifter but then I have also been told that it could be the exhaust manifold leaking because it goes away after it warms up a bit and expands.

Any other ideas or fixes? I was also given the suggestion to run 5 quarts of my regular synthetic oil and a quart of Marvel Mystery Oil. That solved some issues on similar cases over on JeepForum.

Thanks,
Michael

The Marvel is more of a solvent. It's not good to run that high a concentration for long periods. It's good stuff mind you, but not really good for the engine. I'd put my money on the manifold, but it could also be lifters. What brand of oil filter do you run?

I don't think I'd get too upset. My 4.0L has a tick at idle that goes away as I increase RPM. I've got about 240K miles on it though.

If its a loud clicking, could be the starter bendix sticking for a few seconds after startup.

TerryD wrote:The Marvel is more of a solvent. It's not good to run that high a concentration for long periods. It's good stuff mind you, but not really good for the engine. I'd put my money on the manifold, but it could also be lifters. What brand of oil filter do you run?

I don't think I'd get too upset. My 4.0L has a tick at idle that goes away as I increase RPM. I've got about 240K miles on it though.

There are 96K miles on the engine. Ran Synthetic oil since the first change (Owned since brand new) We have been running Mobile 1 High Mileage Fully Synthetic 10w-30 and Mopar Filters. It used to only tick when cold (winter time cold) Now it seems to do it 8/10 times when just the engine is cold. I do not think it makes any sounds when starting warm. Like go to the store and come back out and start it and its fine.

Snobrdrkid07 wrote:

TerryD wrote:The Marvel is more of a solvent. It's not good to run that high a concentration for long periods. It's good stuff mind you, but not really good for the engine. I'd put my money on the manifold, but it could also be lifters. What brand of oil filter do you run?

I don't think I'd get too upset. My 4.0L has a tick at idle that goes away as I increase RPM. I've got about 240K miles on it though.

There are 96K miles on the engine. Ran Synthetic oil since the first change (Owned since brand new) We have been running Mobile 1 High Mileage Fully Synthetic 10w-30 and Mopar Filters. It used to only tick when cold (winter time cold) Now it seems to do it 8/10 times when just the engine is cold. I do not think it makes any sounds when starting warm. Like go to the store and come back out and start it and its fine.

You'll have to investigate to find out what it is.

Do some searching on other people complaining about the same issue. Almost all 4.0s have a tick or make some kind of noise it's just the nature of the engine and they'll run like that forever.

Most people have come to the consensus of a lifter that is ticking.

Thanks for the info guys!

As long as you have oil pressure and you're not getting metal shavings out on oil changes, keep going like you are. When you start losing oil pressure and finding metal shavings, you've got about 300,000 miles left on the engine.....

TerryD wrote:As long as you have oil pressure and you're not getting metal shavings out on oil changes, keep going like you are. When you start losing oil pressure and finding metal shavings, you've got about 300,000 miles left on the engine.....

I have not seen anything like that in the oil.

The oil pressure gauge stays over half and below the 3/4 mark.

So I think I am good. I guess that this is just the nature of the beast lol