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04-25-2007
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#1 |
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Join Date: Apr 2007
Location: PA.
Posts: 4
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ENGINE
I HAVE A 90 WITH 38,000 , I HAVE A MOTOR NOISE AT REV. WHEN LETTING OFF THROTTLE, SOUNDS LIKE BEARING NOISE?? OIL PRESSURE IS VERY GOOD, NOISE IS LOUDER IN MORNING, ANY IDEAS???/ HATE TO TEAR DOWN AND NOT FIND A PROBLEM, KEVIN
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04-25-2007
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#2 |
Join Date: Sep 2006
Location: lone pine and mammoth lakes
Posts: 1,407
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Re: ENGINE
does the car make noise in neutral with the clutch out / you could be losing the flywheel?
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04-25-2007
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#3 |
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Join Date: Apr 2007
Location: PA.
Posts: 4
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Re: ENGINE
WE CHECKED THE FLYWHEEL IT IS OK, REV AND BACK OFF, IT WILL MAKE NOISE MOST OF THE TIME, WHEN PULLING OUT MAKES NOISE UNDER LOAD, KEVIN
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04-25-2007
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#4 |
 
Join Date: Dec 2003
Location: Arcadia,OK
Posts: 3,394
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Re: ENGINE
You should try to locate the noise, front, rt side, left side, center, deep, etc and use a rod (wood dowel rod abt 2' long) placed on the engine and to your ear. Is the noise rpm frequency, no particular frequency, multiples of rpm frequency? Describe the noise; rattle, knock (heavy or light), tinny, etc.
Check all the pullys & belt to see if it's a bearing (tensioner, AC clutch, PS pmp, water pmp) or pully. A timing light works pretty good. Very difficult to analyze like this.
__________________
Jerry Downey JERRYS LT5 GASKETS & PARTS http://www.jerrysgaskets.com 1994 ZR-1, Black/Black, Lingenfelter Aerobody, 416cu in, 3.91 gears, coil-over susp, Brembo brakes, etc. 2016 Black-Red, 3LT-Z51 Auto 8-speed. |
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04-25-2007
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#5 |
 
Join Date: Jun 2005
Location: pittsburgh
Posts: 4,632
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Re: ENGINE
where in pa are you from
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It's not the car, it's the people - Doug Johnson 90 r/r "KEYS ON" nick named "T.L.B" |
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04-26-2007
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#6 |
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Join Date: Apr 2007
Location: PA.
Posts: 4
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Re: ENGINE
I AM IN ALTOONA PA.
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04-26-2007
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#7 |
Join Date: Aug 2006
Location: Texas
Posts: 518
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Re: ENGINE
I had one of these weird noises under the car and almost tore the Z apart trying to find it only to discover it was a loose exhaust heat shield which really showed itself at 15-1800 RPM. Not saying this is what your problem is but sometimes little things can be the worst and lead to spending big money needlessly.
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1991 ZR-1, Black, Black, # 541 |
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04-26-2007
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#8 |
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Join Date: Dec 2003
Location: Arcadia,OK
Posts: 3,394
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Re: ENGINE
I'm wondering about the catalytic convertor(s). Wasn't it the 90 model without the screen and catalyst could get back into the exhaust header? Point is, it could be in the catalytic convertor, hence the reason to try & isolate where it's coming from and the frequency.
Loose heat shields, as stated above, have ocurred several times, driving the owners nuts to find the source.
__________________
Jerry Downey JERRYS LT5 GASKETS & PARTS http://www.jerrysgaskets.com 1994 ZR-1, Black/Black, Lingenfelter Aerobody, 416cu in, 3.91 gears, coil-over susp, Brembo brakes, etc. 2016 Black-Red, 3LT-Z51 Auto 8-speed. |
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04-27-2007
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#9 | |
Join Date: Jul 2006
Location: Omaha, NE
Posts: 322
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Re: ENGINE
Quote:
 I've been trying to locate mine for the last month that happens right at 1500rpm after the car has warmed up....I'm going to give it one more shot this weekend in an effort to finally kill this snake.
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SteveB '94 ABZ Lucky #13-SOLD |
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04-27-2007
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#10 |
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Join Date: Aug 2005
Location: San Fernando Valley, CA.
Posts: 896
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Re: ENGINE
Id second the motion on checking your cats and using a makeshift stethescope to piinpoint the noise. I had a 5.0 with cats that just "went bad" and could swear up and down I had a rod knock.
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1990 ZR1, 142,000 miles-Black on black 4.09's Haibeck chip, 3"exh, K&N, meth inj. |
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