Knock Retard

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Jan 9, 2006 | 01:05 PM

INTHERED

Thread Starter

Burning Brakes

Joined: Aug 2003

Posts: 1,070

Likes: 9

From: MARRIOTTSVILLE MD

Knock Retard

When experiencing knock and the PCM starts retarding the spark
advance does it also add any extra fuel ?

Thanks >>>>> INTHERED

Jan 11, 2006 | 11:27 AM

aj98

Melting Slicks

Joined: Dec 2005

Posts: 2,017

Likes: 169

From: SE VA VA

Quote:

Originally Posted by INTHERED

When experiencing knock and the PCM starts retarding the spark advance does it also add any extra fuel ?

Thanks >>>>> INTHERED

I can't answer the question, but I can perhaps provide some insight.

Mine has always pinged/knocked for a seconds near the top of the torque curve during WOT, usually between the 1-2 shift. It also blows bit of smoke at the same time. I've also noticed it one a 6-5-3 (hit it) - at about 60mph.

I have queried the dealers mechanic about this.

His claim it is normal - that the mph range of each gear is so large that it's almost unavoidable -

Further, the PCM can be tweaked to reduce/eliminate the ping,
but the tradeoff is lowered performance during more 'normal' driving.

My guess is the smoke is directly related to the oil consumption at high rpm/low gear problem

FWIW,

AJ
01 NBM Coupe
MN6
R8C

Jan 11, 2006 | 02:07 PM

vettenuts

Team Owner

Joined: Mar 1999

Posts: 22,025

Likes: 192

From: At the beach in little Rhody

I won't guess, so it might be good to cross-post this in the tuning section.

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