Help! Engine Noise - ZR-1 Net Registry Forums

Scrrem · 12-13-2009

Went out for a drive yesterday and found I have a new knocking noise coming from the front of the engine. I have to do some more probing today, but doesn't sound like it's an idler pulley, AC or alternator. To me, it sounds like it coming from the camshaft timing chain area. This may be too big of a job for me. Does anyone know of a good LT5 mechaninc on N. VA?
Rich

12-13-2009

Check your oil level. Might be starving the lifters a bit.

Scrrem · 12-13-2009

Quote:

Originally Posted by Jeffvette

Check your oil level. Might be starving the lifters a bit.

Drove the card over to QB93Z's house yesterday to change the oil. Was making the noise before the oil change and after. Oil was at the proper level.

Dynomite · 12-13-2009

Get yourself a good stethoscope

HIZNHRZ · 12-13-2009

Rich, I had a engine knock in my Red/Gry 91 several years ago. Is it a knock only or is there any sign of a miss under load?

A26B · 12-13-2009

Does it occur only at idle?

Scrrem · 12-13-2009

Quote:

Originally Posted by A26B

Does it occur only at idle?

The knock is present at idle and increases speed under load.

Just got back from Napa and picked up a Stethoscope, going out to probe now. Will update shortly.
Rich

Aurora40 · 12-13-2009

Quote:

Originally Posted by Scrrem

Does anyone know of a good LT5 mechaninc on N. VA?
Rich

Yeah right! Certainly none by profession, though obviously there are some excellent owners/hobbyists here.

I'd say try to track down where it's coming from before resorting to anything drastic. Can you grab a camera, pop the hood, and get a video of the sound?

Scrrem · 12-13-2009

Quote:

Originally Posted by Aurora40

Can you grab a camera, pop the hood, and get a video of the sound?

Damn, that's a great idea!!! Duh...why didn't I think of that!!! Will shoot some video and post shortly.

Rich

Ccmano · 12-13-2009

Pull the accessory belt off and run the engine briefly. That will instantly eliminate anything, including the water pump, run off the belt. You will then know if it's internal or external to the engine.
H

12-13-2009	#1
Scrrem Join Date: Feb 2009 Location: Alexandria, Virginia Posts: 1,467	Help! Engine Noise Went out for a drive yesterday and found I have a new knocking noise coming from the front of the engine. I have to do some more probing today, but doesn't sound like it's an idler pulley, AC or alternator. To me, it sounds like it coming from the camshaft timing chain area. This may be too big of a job for me. Does anyone know of a good LT5 mechaninc on N. VA? Rich __________________ 1990 Bright Red Coupe #608 380 Stroker, Ported Heads/Intake/Housings/TB Haibeck Secondary Delete Chip / Pete's Cams George Braml Intake / FIC Injectors Coated SW Headers / Corsa Bill Boudreau B/B ZF6 / Viper 4.10 gears Ron Davis Radiator Pioneer AVIC-Z140BH NAV Fikse FM5's 285 / 335 / C6 Brakes WAZOO Member

12-13-2009	#2
Jeffvette Guest Posts: n/a	Re: Help! Engine Noise Check your oil level. Might be starving the lifters a bit.

12-13-2009	#4
Dynomite Join Date: Aug 2009 Location: South Dakota/California Posts: 3,796	Re: Help! Engine Noise Get yourself a good stethoscope __________________ Left Clickable links -Solutions- LT5 Modifications/Rebuild Tricks Low Mileage ZR-1 Restoration 1990 Corvette (L98) Modifications LT5 Eliminated Systems LT5 Added Systems LT5/ZR-1 Fluids 1995 LT5 SPECIFIC TOP END REBUILD TRICKS

12-13-2009	#5
HIZNHRZ Join Date: Apr 2004 Location: Germantown, MD Posts: 738	Re: Help! Engine Noise Rich, I had a engine knock in my Red/Gry 91 several years ago. Is it a knock only or is there any sign of a miss under load?

12-13-2009	#6
A26B Join Date: Dec 2003 Location: Arcadia,OK Posts: 3,386	Re: Help! Engine Noise Does it occur only at idle? __________________ 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.

12-13-2009	#10
Ccmano Join Date: Jun 2006 Location: Sparks, NV Posts: 2,852	Re: Help! Engine Noise Pull the accessory belt off and run the engine briefly. That will instantly eliminate anything, including the water pump, run off the belt. You will then know if it's internal or external to the engine. H __________________ 90'ZR-1 #1461 Red/Black Ported Intake, Degreed Cams, OBX Headers & Exhaust, Fidanza FW, Secondary Delete, Custom tune, C6 GS Wheels. Sold 08 C6 Z51 Crystal Red Metallic Sold Vararam Intake, Tune, Sold 05 C6 Z51 Red/Black Sold 90'ZR-1 #1723 Black/Gray Sold but not forgotten 91' Z51 L98 White Vert. My First, you always remember your first. Sold.