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#1
08-03-2008, 05:27 PM
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97 GT engine squeal
I have an engine squeal coming from my Gt when I let off the gas and coasting to a red light. It only seems to happen after driving for awhile. When I tap the gas it stops, and does not do it under power. I have tried turning off the AC and this does not make a difference. I just replaced the belt and idle tension pulley not to long ago. Any suggestions.
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#2
08-04-2008, 04:08 PM
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Re: 97 GT engine squeal
Have you recently replaced the PCV valve, and if so, did you remove the o-ring from the old one and reinstall it on the new one? If not, they will whistle under high vacuum situations.
__________________
 Still waiting for the "good old days" I'll get to bore my future grandchildren with!
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#3
09-09-2008, 08:04 AM
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Re: 97 GT engine squeal
Any other suggestions, this noise is getting worse, last night I could hear my wife coming down the street. I just changed the PCV valve and I did not see any o ring on the valve its self. I did notice the MAP sensor is a little loose, 2 of the locking tabs are broken (one on each side).
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#4
09-09-2008, 09:32 AM
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Re: 97 GT engine squeal
I suggest that you re-read what Rich wrote. You need a rubber o-ring on your PCV valve. You can purchase a new PCV valve kit at your local dealer for around 20.00 bucks. It includes PCV valve, o-rings, and a new MAP/PCV bracket that will help to keep your MAP sensor seated tight. You may have two vacuum leaks, one at your MAP sensor and at you PCV valve.
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1997 GPGT 3.8 Dark Teal Metallic. 222000 4 door sedan No Mods Last edited by JonJon68; 09-09-2008 at 10:19 AM.
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#5
09-09-2008, 04:07 PM
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Re: 97 GT engine squeal
Thanks, I went today and got the PVC kit for $27 and some change. The MAP sensor holder is a different style but it will fit, it also came with a spring that sits on top of the PVC valve. I will let you know if this works.
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#6
09-09-2008, 04:36 PM
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Re: 97 GT engine squeal
Yes, I had the older style also and no spring. The new kit included all of these. Even if this doesn't fix the noise you described, you needed these new parts, o-rings anyway. Good luck and keep us informed.
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1997 GPGT 3.8 Dark Teal Metallic. 222000 4 door sedan No Mods
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#7
09-09-2008, 11:37 PM
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Re: 97 GT engine squeal
My water pump made a slight squeal and replacing it fixed it. I have also heard bad bearings in an alternator make a squeal.
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97 Grand Prix GT 360,000 miles as of 02-01-09 391 000 miles as of 11-17-11 400,000 miles as of 3-15-13 01 Duramax/Allison 07 G6 convertible
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#8
09-10-2008, 12:26 AM
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Re: 97 GT engine squeal
I have run into that squeal in the past. Another shop had installed a new upper plenum and did not install the PCV valve. The noise in this case was actually air rushing into the engine through the rear valve cover gasket. I'll admit I scratched my head for a few minutes before I put all the pieces together on that one!!
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#9
09-19-2008, 02:09 PM
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Re: 97 GT engine squeal
Just an update, so far so good, no more noise since I installed the new PVC kit from the dealer. Keeping fingers crossed. I will no more tonight since I will travel about 100 miles. Everything else since then has been local driving. Thanks for all the suggestions.
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#10
09-19-2008, 08:11 PM
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Re: 97 GT engine squeal
Just got back from my 130 mile road trip and all went well, no noise. Thanks again for all the help.
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#11
09-20-2008, 07:20 AM
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Re: 97 GT engine squeal
You are very welcome. Thanks for the feedback as we like happy endings, and it may help someone else reading this thread with the same issue.
__________________
Still waiting for the "good old days" I'll get to bore my future grandchildren with!
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