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Whistling/whining noise when engine running

23K views 34 replies 12 participants last post by  PlayGolf69 
#1 ·
My 2014 Overland has developed a very quiet whistle when the engine is running - but it is independent of engine speed. It is noticeable up to about 30kph when it gets drowned out by road noise.
It sounds like an air whistle, or maybe a pump of some sort, although the frequency seems a bit high for that.
The car has done about 30,000 km, and I first noticed it after the 30,000km service.
The noise is there most, but not all, of the time, and I think only when the engine has warmed up.
I'll take it back to the dealer, but because it is pretty quiet, I'm not confident they'll have a clue what it is, so thought I'd look here for ideas first!
All suggestions welcome....
 
#2 ·
I am hearing it too. It's just loud enough to be unsettling. Very high pitch. Try getting out of your vehicle and put your ear near the right rear wheel well with the engine running. Do you still hear it? If so, it might be the DEF or fuel pump.


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#5 ·
It is odd that it just started though, and it loud enough that I would have noticed it before. The throttle makes no difference except in so far as the engine noise eventually drowns it out as more throttle is applied.
 
#7 ·
Fuel pump is a clue. Mine started immediately after a service, at which both fuel filters were replaced. If I can figure out where they are, I'll see if they appear to be fiTed OK. Maybe the pump is sucking air or something. At the moment it is happening with the tank nearly full.
 
#8 ·
You might try re-priming the fuel pump. Seemed to help with mine, although I don't know if it actually did something or it was just a coincidence. In any event, it's easy and you're not out anything to try. With the engine off, and your foot off the accelerator, push the ignition button twice to the run position. Leave it there for about 30 seconds until the fuel pump shuts off. Turn it off. Repeat two more times. Fuel pump is primed. It's the same procedure in the owners manual for when you run out of gas and need to prime the fuel pump after refueling.


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#10 ·
Did you ever figure out what is causing the whistling noise and a resolution? Mine has been driving me crazy recently and I'm sure Jeep service will not be able to duplicate or consider it operating as intended. I didn't notice it until about 8500 miles.


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#11 ·
No unfortunately. It seems to be intermittent, and isn't loud enough to annoy me too much, so I'm waiting til the car has to in for something else. I have another intermittent whistling noise too - this one when lifting off the throttle above 70kph. The noise is similar enough that despite the different times it occurs, could be related. I'll get them to check the air intake and turbo hoses, but like you, I don't hold out much hope. Do you have a whistle under trailing throttle?
Russell
 
#12 ·
Same here. Intermittent whine. Can't really determine the pattern except that it seems to be a bit more apparent when the gas tank gets down to the halfway mark. Might be a coincidence, though. Annoying, but as long as the vehicle doesn't die on me in the middle of nowhere I can probably live with it.


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#13 ·
Mines doing the whistling on trailing throttle above 70kph now - on a full tank!
Haven't heard the whine while idling and at low speed recently - maybe just getting used to it. But I'll check again later today.
Russell
 
#15 ·
Forgive the seemingly silly question this far into the thread, but you're not all just talking about the sound a turbo makes as it spins up, are you? Do these cars have any way to display a boost gauge? If so, does it correspond with boost?
 
#17 ·
There have been two whistling noises described here. As they apply to my car, one is a light whistling noise, which isn't there every day, but when it is, it is there all the time the engine is running, whether the car is moving or not. It is there up to at least 60kph when it is drowned out by road noise.
The other problem may be related to the turbo, in that it happens with a trailing throttle above about 70kph.
In both cases, the pitch and volume of the sound is constant - independent of engine and road speed. The "trailing throttle" noise could be an air leak when there is a high vacuum in the manifold - perhaps a loose turbo hose or vacuum line. If it is related to boost, it is low boost. I don't know of a way of monitoring boost though.
Thanks,
Russell
 
#18 ·
I can hear it the most strongly when I put my ear near the left rear wheel well, which inclines me to believe that it's either a fuel pump or the DEF pump. I've driven turbos for years. Definitely not the sound of the turbo spooling up. Not coming from the engine compartment.


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#19 ·
I can't pick the left rear wheel well as the main area, but I do suspect the fuel pump area, as it started immediately after I had the fuel filters replaced.
Russell
 
#24 ·
Excursion - which adapter do you use?
 
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#26 ·
Anyone ever figure out exactly what is causing this? I started experiencing this today after picking up from the dealer (only service work done was TSB 18-018-14)
 
#27 ·
I have not had a resolution to either of the noises (referred to in post 17). The one there whenever the engine is running has quietened down to the point I cannot see the service guys hearing it enough to agree it's a problem. The whine when lifting off is intermittent, and never there when I have the opportunity to take the car in!
Thanks,
Russell
 
#28 ·
Here's a totally uninformed idea about this noise (since I don't have my car yet). Is this problem only on the cars with Off Road Adventure Package? If so, is it possibly related to the pneumatic system that adjusts the suspension? It sure could be related to a high pressure air pump or leak - altho I have no idea why the pump would be operating except when a change in height is called for.
 
#30 ·
I don't have the air shocks and mine makes the noise intermittently. As someone on this thread mentioned awhile back, it seems as though it happens most often when I'm under a 1/4 tank of fuel. I usually hear at lower speeds or idle but the sound doesn't vary with RPM's. It's hard to replicate when necessary, so I haven't been able to consult with dealer.


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#31 ·
I have the whistle sound as well. Mine goes away when warm. What I find interesting is that this engine is so quiet to what I was used to that my previous rides you would never hear this whistle ever.
As far as I'm concerned it isn't doing any harm and will just leave things alone...
 
#32 ·
That's probably what I will end up doing too - nothing. My concern was not so much the whistle per se, but that it started immediately after a service. Which may have been a coincidence of course.
Of more concern actually, is the whistle on the overrun, as it definitely sounds like air being suck in some where it maybe shouldn't be.
Thanks,
Russell
 
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