Noisy engine

[taylorcedric]

I have a 2005 KJ 3,7l petrol. The engine is very noisy, cold and not too bad when hot. I have been told that it is probably a sticky lifter. I have used an additive to the oil which does not seem to have made a diff. Any advice other than having the motor stripped. Which I cannot do myself.

 

[HoosierJeeper]

I'm not real knowledgeable but do you have sludge issues? Is the oil clean?

 

[GunnerSchenck]

I have used an additive to the oil which does not seem to have made a diff.

Kill-a-car in a bottle. Merely masks the problem rather than fixing it. Think of it this way..oil is a lubricant for your engine, but you're adding something to the lubricant that's made to do this exact opposite of lubricate.

Does it sound like ticking/knocking, clacking, or metal chatter?
Coming from towards the front of the engine or towards the valve covers? Sound like it's worse on one side of the engine vs. the other side?
You could try taking a 3/8 extension and setting it on top of the valve covers while the engine is running and see if the sound gets more noticable or if you can feel added vibration through the extension on one side vs the other..
If you take the oil cap off while the engine is running, does the sound get louder or stay the same?

Our 3.7 engines are extremely notorious for having a noisy valvetrain, especially when being cold.. but they're also notorious for throwing rocker arms, stuck lash adjusters, and dropping valve seats.. but if either of these happened, your noise would either be much more evident, or your engine would have no compression in whichever cylinder the valve seat dropped out of.
No check engine light I imagine, or you'd likely have stated so.. But a thrown rocker arm, or stuck hydraulic lash adjuster often won't even thrown a MIL.

 

[LibertyTC]

Geez how cold can it be in S.Africa?
Come to BC Canada, my Jeep complained this AM at 20 degrees F (-6c) but not too bad.
What additive did you use exactly? How many miles on engine now?
I would want to pull valve covers and have a peak in there. Sludge issue? or Clean..?
Inspect rockers etc...
What kind of oil are you using 5w-30 dino or full synthetics?

 

[rjkj2005]

Mine isn't as noisy as it used to be. May people including myself have changed lash lifters and rockers only to find the same noise. My noise isn't there at first start up. But as the pcm goes from open loop to closed loop and starts talking info from the o2s.( And yes I've replaced them as well as well as the intake manifold seals and injector o-rings) I get a tic tic tic it comes and goes until the fuel trim settles down back to +/- 0. From a high of +.10. Then the tic goes away until the engine cools off below 140°. The it will tic until it reaches that 140° mark. Its a pre-ignition ping. I've tried all the over the counter stuff. Nothing helped it until I found BG products. Found a shop here that does a decarbonizing of the intake and combustion chamber. We took a scope And ran down inside each cylinder. The amount of carbon buildup was unbelievable. There was so much build up it looked like the surface of a black Rocky moon. The Valves where just coated thick with carbon. So we did the decarbonizing and oil flush designed to break down the carbon around the rings . Went back next oil change. Completely different looking interior of the cylinders. Still had build up. On the piston tops. But at least one I could see the piston. The intake valve almost was shinny. Did another decarbonizing of the engine a few weeks ago. The tick is still there but it's not as loud, doesn't last as long and the power increase and mileage is simple amazing. Went from averaging 10/12. To 15/18. That's with 265/70/16 BF Goodwrench Rugged Terrains. Find a shop that uses BG products. The GM dealer here uses it as well as the Chrysler deal a few towns over. If its being caused by carbon buildup. The stuff works to clean it out.

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[Tog]

Could be timing chains/tensioners but they normally get noisy when hot not cold

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[JasonJ]

I'd like to know oil viscosity and type, miles on oil before anything else, as well as more details on what it sounds like and from where. Just telling us it is "noisey" doesnt say anything, ALL engines makes noise. Gotta be more specific!

 

[taylorcedric]

Thanks for all the replies. I have got an engine warning light but the error codes indicate Temp sensor or thermostat. I have the parts and having them replaced next week. I will then also have the engine oil drained and fresh oil filled. If I was to describe the noise it would be tac tac tac tac. (very technical jargon). Placed ext on tappet covers, no diff took off oil cap, maybe a bit noisier. Thanks again.

 

[GunnerSchenck]

If it's still there after the work and noticeable, I'd go about removing your valve covers to take a look at your rocker arms and lash adjusters. And the help to do so will be here if you need it

 

[taylorcedric]

Thanks Gunner