Engine noise has increased?

Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Oil pressure is normal check your compression
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Thursday, September 10th, 2020 AT 1:03 PM (Merged)
Tiny
TERRY KRANER
  • MEMBER
  • 1 POST
  • 2008 CHEVROLET SILVERADO
  • 137,000 MILES
Chirping noise under hood. Is it the pulleys?
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Thursday, September 10th, 2020 AT 1:04 PM (Merged)
Tiny
MHPAUTOS
  • MECHANIC
  • 31,937 POSTS
May be pulleys or a worn drive belt, also a soft tension-er if an auto adjust tension-er is installed can do this, you can remove the belt and start to prove that the problem is here. If so start with a new belt and feel all pulleys for notchy movement, start here.
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Thursday, September 10th, 2020 AT 1:04 PM (Merged)
Tiny
CARLOS_09
  • MEMBER
  • 7 POSTS
  • 1993 CHEVROLET SILVERADO
  • V8
  • 2WD
  • AUTOMATIC
  • 190,000 MILES
My Truck Is Making An Anoyying Squeling Sound from under the hood, I have a brand new belt, a brand new altenator, and a brand new tensionner Pulley, and its still making the squeling sound
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Thursday, September 10th, 2020 AT 1:04 PM (Merged)
Tiny
OBXAUTOMEDIC
  • MECHANIC
  • 3,711 POSTS
Hi Carlos,

I believe you also have an Idler Pulley on that engine. It look just about like the tensioner except that it is stationary.

You can check the pulley by.

Spraying the center bolt with a spray lube with engine off then start it if no squeal then replace pulley. Another possibility is the water pump bearings.

.
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Thursday, September 10th, 2020 AT 1:04 PM (Merged)
Tiny
CARLOS_09
  • MEMBER
  • 7 POSTS
I sprayed wd_40 on the bolt on the tenssioner pulley and the noise stops but thats a brand new pulley I just replace it wen it started making the noise
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Thursday, September 10th, 2020 AT 1:04 PM (Merged)
Tiny
OBXAUTOMEDIC
  • MECHANIC
  • 3,711 POSTS
Sorry for delay in responding.

Did you spray the pulley with the engine running? If so you may have also sprayed the belt. It is possible the new belt could be the problem, have seen that a few times.

If making noise again spray the bolt again before starting. Also when replace the pulley did you make sure it spun freely? With some new pulleys the original washer doesn't work so well and will cause problems.
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Thursday, September 10th, 2020 AT 1:04 PM (Merged)
Tiny
CARLOS_09
  • MEMBER
  • 7 POSTS
The engine was off wen I sprayed the pulley and the pulley does spin freely. I will replace the washer to see if that does anything.

Something else I notice is when im doin turns the squeling noises gets louder. I dont know if that means anything
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Thursday, September 10th, 2020 AT 1:04 PM (Merged)
Tiny
GARCIA8
  • MEMBER
  • 1 POST
  • 1990 CHEVROLET SILVERADO
  • V8
  • 2WD
  • AUTOMATIC
  • 189,700 MILES
I have a noise in the engine sounds like a taping sounds if I press on the gas the sounds gets louder somewhat, can you help please
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Thursday, September 10th, 2020 AT 1:04 PM (Merged)
Tiny
JAMES W.
  • MECHANIC
  • 2,394 POSTS
Without actually hearing the noise, all I can do is guess. Considering the engine has 190K on it, it could be a worn valve lifter or rocker arm. Worse case scenario, it could be a rod bearing which would be terminal. A good shop should be able to pinpoint it for you just by listening to it. Hope this helps.
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Thursday, September 10th, 2020 AT 1:04 PM (Merged)
Tiny
OBXAUTOMEDIC
  • MECHANIC
  • 3,711 POSTS
Have you sprayed the belt? If not spray some lube on the belt. With the squeal getting louder when turning wheel could be the belt or even one of the other pulley bearings. If spraying the belt doesn't quiet the squeal try spraying the pulley bearing on the Alternator (even though it is new), A/C Compressor, etc. One at a time.

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Thursday, September 10th, 2020 AT 1:04 PM (Merged)

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