Your knock sensor will be telling the ecm to retard timing.
just a curious question, running lean
Thread Starter
Burning Brakes
Joined: Apr 2005
Posts: 1,110
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From: JUPITER FLORIDA
just a curious question, running lean
If you a running lean, just lean enough to cause some detination at higher rpms could that make you lose a considerable amount of power?
Le Mans Master
Joined: Dec 2004
Posts: 5,789
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From: Myrtle Beach SC
St. Jude Donor '05-'06
If you are getting knocks ,YES. I just went through this with a bad EGR causing knocks.It would not pull under load just stumble until near WOT.Most of the retard was pretty tame too 1-2 deg but it was enough to make the car run poorly.
Le Mans Master
Joined: Oct 2003
Posts: 6,130
Likes: 2
From: seattle WA
It certainly could-don't know what year you have, but a knock sensor MAY cause the light to come on indicating a code has been thrown due to a fault in a circuit or sensor. A knock sensor MIGHT throw a code 43 for instance.
Here's a good site for you to check out.
http://www.c4vettes.com/ecm.htm
Here's a good site for you to check out.
http://www.c4vettes.com/ecm.htm
Race Director
Joined: Sep 2000
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From: The Top of Utah
Originally Posted by cplonner
hmmmm. if it kept knocking would the check engine light come on?
In answer to your "curious question", if the A/F mixture is lean enough to induce knock, then yes, power will be lost. You will lose power from the knocking. You will lose power by the ESC retarding the timing, and you will have less than maximum power due to the lean mixture, alone. In the PE mode you want to see something between 12.5:1 and 13.5:1 A/F ratio for best power.
RACE ON!!!
Thread Starter
Burning Brakes
Joined: Apr 2005
Posts: 1,110
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From: JUPITER FLORIDA
For lean condition I have a Adjustable fuel pressure regulator im about to put in, I gonna change out the egr vavle because its still the old one even though the engine was rebuilt. Even if the afpr fixes the lean mixture i still need to get a tune. Besides a bad egr or a lean condition what faulty components can cause knock?
Also, i no longer have the air recurtulation tube from the catylitic converter connected, is there still use for the rest of the egr system if i do not have this connected?
Also, i no longer have the air recurtulation tube from the catylitic converter connected, is there still use for the rest of the egr system if i do not have this connected?
Last edited by cplonner; Jan 10, 2006 at 11:57 AM.
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Race Director
Joined: Sep 2000
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From: The Top of Utah
Originally Posted by cplonner
Besides a bad egr or a lean condition what faulty components can cause knock?
RACE ON!!!
Last edited by CFI-EFI; Jan 10, 2006 at 12:02 PM.
