MattG

I have been having knock retard problems now for quite awhile. It starts around 4000rpm at WOT and will keep building all the way until I shift. On the street when its cool out I will only see 3-5 degrees, but when its warm or I am at the track I will see up to 7-9 degrees of KR.

When I am at the track I run Sunoco 94 with a bottle of NOS Off-Road Octane Boost, my engine is 11.5 CR, and I have LS1edit so I have played with the timing advance and set it anywhere from 24 degrees down to 19 degrees from 4200rpm - 5500rpm and the KR still happens. Even though I get quite a bit of KR, I NEVER EVER hear a sound out of the engine, and I cannot feel it stumble like an engine normally does when detonating.

Does anyone feel this might be false knock retard? Where would I start looking if it was? Would it be wrong for when I go to the track to turn down the Max KR by RPM to like 3 degrees?

When I am at the track, with 8-9 degrees of KR, I am only pulling like 12 degrees timing advance which is terribly ripping down my trap speeds by at least 5 or 6mph.

Anyone else ever encounter a problem like this? Any experiences someone could share would be greatly appreciated.

Richie Carbone

iTrader: (3)

Could be a bad sensor or wire. Maybe something is vibrating or rattling under the car cuasing false knock.

MelloYellow

Damn Retard!

I feel that most KR is real. Have you decarb'd lately? Addressed the PCV Oil into the engine issue?

Is it in all gears? Which RPM ranges?
How long since a wideband A/F dyno?
What's your IAT looking like?
Dunno if misfires can relate, but how old are the plugs & wires?

<small>[ August 31, 2002, 12:23 AM: Message edited by: MelloYellow ]</small>

Sparky

there was a TSB out awhile back about a pinched wire on the rear sensor.

Also, checkout www.installuniversity.com for ruling out causes of false knock.

Mark