w0rm

I've been having a hard time tracking down what can only be described as a lapping noise coming from the engine bay under idle. It seems like it would be most likely a belt but I've checked and tension seems fine and no damage to any belts.

Anyone have any ideas? I can't hear the lapping under load but that might just be due to the exhaust note. My MPG has also dropped considerably. I'm used to having a CEL due to a straight pipe, but I'll be getting the codes pulled to see if there's anything else.

In addition, I also have a very high pitched whine coming from the engine bay 80% of the time, mostly during cold start / warmup period. Its probably an electric motor or the alternator.. Anything I should check in to on that?

Razz1

High pitch whine is normal.

Lapping. What does lapping sound like.

You mean when I take my tonque and like something like a dog?

DOMINION

"Lapping noise"? Sounds like a Rotary to me

Detrich

mine just starting doing this noise too... it's not the whistle noise of the rotary... it's some other type of swooshing sound that pulsates:

"shhh shhh shhh shhh" sounding like that...

it happens intermittently on my car- even when it's warm. i'm not sure what it is either and wonder if anyone knows what this is or if it's something i need to worry about.

any ideas?

restiller

I was wondering if that sound was my fans. Noticed it around 40k miles. Couldn't be temp related because I heard it at 60 degrees F; it's 20F now and I still hear it.
Subscribing for answers.

Detrich

no one has any experience with this issue?

lshu

It probably is a good idea to check your plug wire connections. I had a kind of loud "ch ch ch" sound a while ago, and I found that the plug wire boots were not firmly on the spark plugs. Pushed everything in firmly and it was fine.

Detrich

thanks for the feedback... are the wire plugs hard to reach for the mechanically-challenged?

05rex8

iTrader: (7)

maybe you are hearing a fapping noise instead

Potentiated

The lapping also sounds like leaves rustling. It happens when you first start your car and, while the car is stationary and in neutral, gently press the accelerator and then let it idle. The lapping/rustling leaves could actually be water swishing.

Could it be the water pump?

restiller

^^Yes, that describes the sound perfectly!

Detrich

seriously guys, we are asking about & trying to discuss a legitimate problem & get help from other club members with knowledge on our issue... If u really don't have constructive info to contribute then please kindly save your comments for the lounge or other threads....

Thanks & much appreciated...

zoom44

air in the heater core. car needs burped. seriously

L337fpc

iTrader: (4)

Yeap I get the noise of liquid moving around when i start my car. I'm also parked on my driveway, which is on a 10-15 grade incline.

Potentiated

And the heater core somehow makes a rustling leaves sound? Are you sure? Seriously.

I think it's more of a water jiggling/swishing sound. To get the sound, gently press the accelerator, and you will see that the sound is concomitant with accelerator. In this case, could it be the water pump moving water around?

zoom44

i dont have a lapping sound. but from the description,


trying to diagnose over the internet, without being in the car thats what id say. if they are all coming from the right side.

but i also believed there is good probability that you "Potentiated" , Detrich and worm are each talking about something different

Detrich

Hmm... Well mine for sure doesn't sound like fluid or liquid motion... The sound I'm getting matches what the thread author described, which is y I sounded in, as I'm trying to decide whether this issue requires a visit to the dealer or if it's something else... Again it kinds sounds like something rubbing gently against a conveyer belt & pulsating during engine idle like "shh... shhh...shhh.". It's not super loud but just enough where it's noticeable.

Thanks for sounding in.. Keep the comments going. Hopefully someone will know exactly what this is...

zoom44

drive up here so i can hear it

Detrich

Too bad it only started recently or I couldve let u listen @ sevenstock

Detrich

i'm going to make an app't and get this checked out as soon as the rain stops. hopefully this week or next. will let everyone know what i find out...

Detrich

alrighty... i made an app't to have this looked at this wednesday. will post what i find out afterwards- though it doesn't seem like too many ppl really are following this thread anymore

Charles R. Hill

iTrader: (7)

If it is a "whistle", check your three breather hoses with the plastic elbows connected to the intake flex duct. Those are prone to becoming brittle/cracking and the "whistling" may be the oil injection nozzle breather hose. Based on limited information I would guess this to be the problem as you have poor fuel economy as a seeming related symptom.

Leaks in these hoses cause erratic MAF sensor readings and the PCM doesn't "like" it.

DOMINION

To the og poster; search: "ticking" on this site and you might find your issue.

risky business

that was my first thought when i read the title!

05rex8

iTrader: (7)

Yeah, Detrich didn't appreciate my sense of humor: