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94 FWB, 93 SDV, 94 FWB (sold), 90 Brougham (sold)
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3,730 Posts
Discussion Starter #1
Well, NODIH was a great help in fixing my initial problem of knock. I replaced the knock sensor, and noticed an immediate gain in power. This however, confuses me, because I am still getting knock. With no codes and clean EGR (yes, this sounds like another post but I don't hijack threads out of respect), I'm wondering how there was a very noticeable gain in power with replacing the knock sensor but still getting the death rattle. In my service manual, I'm told that the knock sensor will tell the EST module to retard the timing up to 20 degrees. No codes, so what exactly is the problem? EST module?

Brian
 

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70 Fleetwood, 87 and 90 Brougham, 94 Fleetwood
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215 Posts
Check your base timing. I believe it is supposed to be 0 degrees BTDC. These Chevrolet engines are pretty benign to EGR. They will run pretty well without it.

Mike
 

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Registered
94 FWB, 93 SDV, 94 FWB (sold), 90 Brougham (sold)
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3,730 Posts
Discussion Starter #3
Base timing is a fine 0 degrees intial, without any wandering. I've removed the EGR valve and cleaned it well, so I'm still confused.

Brian
 
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