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Good Day Everyone,
Wondering if the masterminds here can help me figure out where this ticking is coming from.
First, it’s a 2008 Jeep Liberty 3.7L with 90,000K on the engine.
The ticking happens during cold start ups and it much more noticeable during the cold winter months but will
sound just as bad even in warm weather. Sounds like a diesel engine almost.Brought it to two dealers and both just give me the run around saying it’s either just fuel rail noise or could be piston slap.
Jeep forums haven’t been able to figure it out either.
Once the jeep is 100% warm, the tick is pretty much gone completely. (20+ mins of driving)
Has been doing this for 1.5+ years now. No engine additive makes any difference nor sludge cleaner seafoam marvel mystery oil etc. Ticking does increase with the RPM of the engine.Any idea’s or thoughts on this would be very appreciative.
Rocker arms?
Exhaust Leak?
Rods?
Lifters?
Piston Slap?🙁
http://www.youtube.com/watch?v=AZiWMGDu9gk
https://youtu.be/pW82qOT1b-g
- Replies
The 3.7s and 4.7s are notorious for having loud valvetrains. There really isn’t anything that will fix it, it’s the way they were made, just make sure the oil maintenance is kept up properly.
I’m not a fan of dealer mechanics. They are, typically, more worried about quick money jobs and will tell customers what ever they can to avoid actually having to diagnose something.
Sounds like lifters and/or rockers and a little injector noise to me.
It probably just needs a valve adjustment. You might want to try getting an intake cleaning too.[quote=”thisisbuod” post=130851]I’m not a fan of dealer mechanics. They are, typically, more worried about quick money jobs and will tell customers what ever they can to avoid actually having to diagnose something.
Sounds like lifters and/or rockers and a little injector noise to me.
It probably just needs a valve adjustment. You might want to try getting an intake cleaning too.[/quote]Thanks for taking a listen.
How much does a typical valve adjustment run?
As for proper oil maintenance , this has been done.
And yes dealer techs are definitely not there for the customers. haha
So this would all be common and make sense if this noise goes away almost fully when it has reached full operating temps?
Valve adjustments are neither complicated nor terribly expensive, couple hundred dollars, but if you decide to have it done, do not be surprised if the noise persists. What I heard in the video you posted sounds like a “normal 3.7” to me, and just isn’t fixable. They are noisy.
I’m not sure what the book says, and it depends on the hourly rate of the shop. I would expect somewhere around $100.
As the engine comes up to temp the metal components expand and the gaps close a bit.
This is the reason the engine has a set operating temperature. Because all the parts have specific gaps. And to maintain those gaps it needs to be at a specific temperature.
Also the oil thins out a bit when it gets warm and gets into the lifters more.
The lifters are probably gunked up a bit too (which is normal with age)
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