91 RS Spark Knock, Ping, Detonation, Pre Ignition
Thread Starter
Member
Joined: Apr 2009
Posts: 222
Likes: 1
From: Montgomery, Texas
Car: 86 Camaro
Transmission: 700R4
Axle/Gears: 2.73
Re: 91 RS Spark Knock, Ping, Detonation, Pre Ignition
An update just in case anyone followed this thread. I have the engine tore down and found quite a few problems. First off, the side with high compression had a rebuilt head. I'm thinking this is why it had more compression. May be it was warped and it has been shaved to make it true again. I'm not sure. And the valves wiggle quite a bit when pulled a little ways out indicating pretty bad guides. Next thing was the piston ring gaps were lined up. I'm sure that doesn't help compression. And the rings are wore pretty bad. .032 gaps
Thread Starter
Member
Joined: Apr 2009
Posts: 222
Likes: 1
From: Montgomery, Texas
Car: 86 Camaro
Transmission: 700R4
Axle/Gears: 2.73
Re: 91 RS Spark Knock, Ping, Detonation, Pre Ignition
It was the intake valves!
https://www.thirdgen.org/forums/tech...test-help.html
https://www.thirdgen.org/forums/tech...test-help.html
Junior Member
Joined: Mar 2012
Posts: 3
Likes: 0
From: Mchenry MS
Car: i have a 1991 camaro rs
Engine: 5.0
Transmission: 700r4
Axle/Gears: stock
Re: 91 RS Spark Knock, Ping, Detonation, Pre Ignition
i just replaced my intake man. and throttle body with 1 i got from the junk yard when cleaning it up to put it back on i noticed that the passages to the egr valve were clogged up!if you took off egr valve while it was on car you wouldnt know they were clogged by looking at it only viewing it from under the intake did i see it!but you can take a screw driver and try to poke it thru the passages to see if they might be stopped up!
Thread Starter
Member
Joined: Apr 2009
Posts: 222
Likes: 1
From: Montgomery, Texas
Car: 86 Camaro
Transmission: 700R4
Axle/Gears: 2.73
Re: 91 RS Spark Knock, Ping, Detonation, Pre Ignition
Thanks for the heads up. I have like 4 or 5 of those danr intakes right now.
Thread
Thread Starter
Forum
Replies
Last Post
FormulasOnly
Tech / General Engine
3
Sep 10, 2015 09:07 PM





