what is wrong now?
Thread Starter
Team Owner
Joined: Feb 2001
Posts: 21,016
Likes: 0
From: Galveston... well, Santa Fe Texas
Cruise-In VII Veteran
St. Donor '03 & '06
what is wrong now?
I spend the weekend installing a new intake, and then re-tuning the carb, also I found that my exhaust manifold bolts had backed out, so I re-torqued them.
went for a drive today, got back and now this:
it louder from under the car.
BTW, it's an 84
went for a drive today, got back and now this:
it louder from under the car.
BTW, it's an 84
Le Mans Master
Joined: May 2004
Posts: 5,866
Likes: 60
From: Hellinois
Finalist 2020 C4 of the Year - Modified
I had an El Camino with almost the same noise, chased it for 2 years until a guy told me something to try. Take a distributor gasket & cut it in half, loosen the dist. then lift it just enough to get the half gasket under one side. Tighten it down & start it up, if it is still there, move the gasket piece about 1/4 turn, repeat until it either stops or you have moved it all the way around the distributor. I know this sounds goofy but it worked for me. I am thinking the manifold may not be perfectly flat in the dist. surface which, when you tighten the dist. it ***** it slightly making that squeak or chirp whatever you want to call it. If this trick does not get it then I don't know what to say it might be.
Thread Starter
Team Owner
Joined: Feb 2001
Posts: 21,016
Likes: 0
From: Galveston... well, Santa Fe Texas
Cruise-In VII Veteran
St. Donor '03 & '06
I checked the dist plane with a mechanics rule, and didn't notice and deflection.
so I pulled my belt off and ran the car, noise is the same. so the only thing turning was the crank pulley, which is not touching the oil pan, I checked that by putting my hand behind it.
Using a length of hose as a stethoscope, I put it around the engine, it was noticeable in the drivers side valve cover, so I pulled that, then moved the hose around there as well, and it was extremely loud when I put the hose down the breather holes on the head.
Motor mounts physically looked OK.
so I pulled my belt off and ran the car, noise is the same. so the only thing turning was the crank pulley, which is not touching the oil pan, I checked that by putting my hand behind it.
Using a length of hose as a stethoscope, I put it around the engine, it was noticeable in the drivers side valve cover, so I pulled that, then moved the hose around there as well, and it was extremely loud when I put the hose down the breather holes on the head.
Motor mounts physically looked OK.
Instructor
Joined: Aug 2012
Posts: 136
Likes: 2
From: Reno Nv
I checked the dist plane with a mechanics rule, and didn't notice and deflection.
so I pulled my belt off and ran the car, noise is the same. so the only thing turning was the crank pulley, which is not touching the oil pan, I checked that by putting my hand behind it.
Using a length of hose as a stethoscope, I put it around the engine, it was noticeable in the drivers side valve cover, so I pulled that, then moved the hose around there as well, and it was extremely loud when I put the hose down the breather holes on the head.
Motor mounts physically looked OK.
so I pulled my belt off and ran the car, noise is the same. so the only thing turning was the crank pulley, which is not touching the oil pan, I checked that by putting my hand behind it.
Using a length of hose as a stethoscope, I put it around the engine, it was noticeable in the drivers side valve cover, so I pulled that, then moved the hose around there as well, and it was extremely loud when I put the hose down the breather holes on the head.
Motor mounts physically looked OK.
if it is fron the back the hight of the Distributor drive gear and cam my have changed
Team Owner
Joined: Sep 2003
Posts: 25,373
Likes: 2,734
I checked the dist plane with a mechanics rule, and didn't notice and deflection.
so I pulled my belt off and ran the car, noise is the same. so the only thing turning was the crank pulley, which is not touching the oil pan, I checked that by putting my hand behind it.
Using a length of hose as a stethoscope, I put it around the engine, it was noticeable in the drivers side valve cover, so I pulled that, then moved the hose around there as well, and it was extremely loud when I put the hose down the breather holes on the head.
Motor mounts physically looked OK.
so I pulled my belt off and ran the car, noise is the same. so the only thing turning was the crank pulley, which is not touching the oil pan, I checked that by putting my hand behind it.
Using a length of hose as a stethoscope, I put it around the engine, it was noticeable in the drivers side valve cover, so I pulled that, then moved the hose around there as well, and it was extremely loud when I put the hose down the breather holes on the head.
Motor mounts physically looked OK.
The suggestion with the distributor gasket is somewhat of a "legacy" fix but it certainly has in the past. It's been a very long time since I've heard it mentioned. I hadn't thought of my friend Chet for many years - pleasant memories. He'd mention something like that to you, scratch his head, wink and walk away! You sometimes wondered!
Thread Starter
Team Owner
Joined: Feb 2001
Posts: 21,016
Likes: 0
From: Galveston... well, Santa Fe Texas
Cruise-In VII Veteran
St. Donor '03 & '06
I pulled the distributor and reseated it with no change, i looked at the distributor gear and there is no new metal or anything that looks like its not right
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Top 10 Corvette Engines RANKED by Peak Torque (70+ Years of Muscle!)
Joe Kucinski
Corvette ZR1X Will Be Pacing the Indy 500, And Could Probably Race, Too!
Verdad Gallardo
Top 10 Corvettes Coming to Mecum Indy 2026!
Brett Foote
Top 10 C9 Corvette MUST-HAVES to Fix These C8 Generation Flaws!
Michael S. Palmer
10 Revolutionary 'Corvette Firsts' Most People Don't Know
Joe Kucinski
5 Reasons to Upgrade to an LS6-Powered Corvette; 5 Reasons to Stay LT2
Michael S. Palmer
2027 Corvette vs The World: Every C8 vs Its Closest Competitor
Joe Kucinski
Le Mans Master
Joined: May 2006
Posts: 9,226
Likes: 9
From: Irvine Ca
Just take a long metal rod and with one end to your ear, touch it to various parts of the motor, you'll soon isolate exactly where it is coming from.
Le Mans Master
Joined: May 2004
Posts: 5,866
Likes: 60
From: Hellinois
Finalist 2020 C4 of the Year - Modified
MonteHall, I had my distributor out a dozen times without finding this noise. I may be completely off as to my opinion of the noise but a distributor gasket is an awful cheap experiment.
Team Owner
Joined: Sep 2003
Posts: 25,373
Likes: 2,734
Very good possibility but I went all over my El Camino's engine with a stethoscope and it didn't show me a thing. If the noise is the same as mine was it is almost impossible to pinpoint and like the op's engine, the noise was louder under the car.
MonteHall, I had my distributor out a dozen times without finding this noise. I may be completely off as to my opinion of the noise but a distributor gasket is an awful cheap experiment.
MonteHall, I had my distributor out a dozen times without finding this noise. I may be completely off as to my opinion of the noise but a distributor gasket is an awful cheap experiment.
Thread Starter
Team Owner
Joined: Feb 2001
Posts: 21,016
Likes: 0
From: Galveston... well, Santa Fe Texas
Cruise-In VII Veteran
St. Donor '03 & '06
It might be worth investing in a distributor gear also. The only thing that he's changed is the manifold and it makes good sense that the relationship of the gear to the cam is certainly different. Maybe stack a couple gaskets and try it, see if it changes the pitch. What happens if you attempt to do the oil pump with a priming shaft?
Tomorrow I'm going to put my old cast-iron intake back on and see what changes.
Instructor
Joined: Nov 2011
Posts: 222
Likes: 0
Is it a 6 speed? and if so does it go away when you push the clutch in? Mine made the same noise till i tossed the dual mass flywheel. It would only make that noise when hot, it was exacerbated by the hot miss of my failing injectors and a black tag zf.
Sounded damn near just like that.
Sounded damn near just like that.