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  #1  
Old 06-10-2016, 06:51 PM
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Engine noise

I own a 2000 wj with the 4.7L V8 and ive been hearing some engine noise for the past couple of months. It only makes the sound when the engine block is cold. It has a low tone and is repetitive but relative to rpm. It sounds like tick/slap. I've had several mechanics look at it, but i received several answers. The first guy was dead certain it was a bad engine rod. The second claimed he fixed the sound when in reality he did not fix anything and charged me $400 for an oil change. the third guy says his best guess was that is was a gummed up or faulty lifter. Has anyone else experienced the same sound in the 4.7l V8 and do you know whats causing it?

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  #2  
Old 06-11-2016, 08:36 AM
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Re: Engine noise

Maybe that a sound clip would help.
First it is important to discover if the noise is coming from the head area, or more from the lower end. A hydraulic lifter which looses its oil when the engine is off, will cause a ticking sound when started, but the sound will stop after some minutes of running. This is a tick coming from the head area. With a mechanics stethoscope it will be easier to pinpoint the area where the noise is coming from.
If the problem is a rod, it most probably will not produce a ticking noise, but more of a knocking.
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Old 06-11-2016, 06:14 PM
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Re: Engine noise

These stethoscopes are great for isolating the source of engine noise. I don't use mine often but it paid for itself the first time.
https://www.amazon.com/s/ref=nb_sb_n...cs+stethoscope
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Old 06-14-2016, 05:08 PM
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Re: Engine noise

If its an engine lifter, what are the side effects to a bad one, how long will the engine last?
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Old 06-14-2016, 07:12 PM
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Re: Engine noise

Depending on engine miles, you might want to try Seafoam or STP.

Seafoam oil treatment can clean modest amounts of crud in lifter innards, but on a higher mileage engine you risk the lifter getting worse.

STP tends to drain down less. Seafoam followed by STP may help.

Are any of those mechanics at all knowledgeable about that particular engine?

Most hydraulic liftered engines tend to develop a cold start tick particularly when turned off after quite hot and then left set overnight. I don't recall it ever hurting any of mine.

There are other tick generators--some really wierd like the pulley on the front of the crank.

Also evap systems...

If you are careful, you can use a long piece of rubber surgical hose and a plastic funnel as a poor man's stethoscope. The real ones aren't that expensive--but if your mechanics didn't use one, I'd buy the rubber hose and strangle them with it.
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Old 06-14-2016, 08:05 PM
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Re: Engine noise

Check your evaporative emission control system as there are a couple of check valves that clatter and sound exactly like lifter noise under the conditions you mention.

LOL... my 02 4.7L V8 did that from day one.
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Old 06-15-2016, 06:54 AM
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Re: Engine noise

Quote:
Originally Posted by MDBones View Post
Check your evaporative emission control system as there are a couple of check valves that clatter and sound exactly like lifter noise under the conditions you mention.

LOL... my 02 4.7L V8 did that from day one.
The EVAP solenoid is normally not activated directly after a cold start, it should warm up a bit before the PCM commands the pulsing ground signal for the solenoid. That being said, the solenoid makes quite some noise indeed and there is even a TSB for isolating the solenoid from the fender with some rubber isolator.
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Old 06-15-2016, 04:41 PM
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Re: Engine noise

Where is the evaporative emission control system valves located?
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Old 06-15-2016, 06:36 PM
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Re: Engine noise

The EVAP solenoid valve is mounted to the left fender (as seen from drivers position)
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  #10  
Old 06-15-2016, 07:29 PM
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Re: Engine noise

Ill take a look, and thanks for the help so far guys.
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