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91 RS Spark Knock, Ping, Detonation, Pre Ignition

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Old Mar 11, 2010 | 12:23 PM
  #51  
morepowerjoe's Avatar
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Joined: Apr 2009
Posts: 222
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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
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Old Mar 25, 2010 | 09:18 PM
  #52  
morepowerjoe's Avatar
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Joined: Apr 2009
Posts: 222
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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
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Old Jun 28, 2012 | 01:13 PM
  #53  
Twiztid Tim's Avatar
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Joined: Mar 2012
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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!
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Old Jun 30, 2012 | 04:29 PM
  #54  
morepowerjoe's Avatar
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Joined: Apr 2009
Posts: 222
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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.
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