Car knocking and running lean
Thread Starter
Joined: Sep 2004
Posts: 4,894
Likes: 9
From: Tampa, FL
*phew*
Crisis averted, problem solved.
After I did the valve adjustment, I mistakenly put the pcv line going to my catch can over the top of vacuum line going to the FPR.
Here's a pic to show what I'm talking about:
Its fixed in this pic, but imagine the PCV line directly on top of that line and that's how it was. That PCV line is very beefy. It pinched the vacuum line on the FPR and wasn't allowing it to see full vacuum, which in turn threw off the tune.
I turned closed loop back on and its working spendidly. Our winter temps just kicked in recently down here in FL so its going to take some cycles to get my trims right to eliminate the remaining small amounts of knock (which is very very little).
Watch those vacuum lines and pay attention to knock your knock count fellas. Had I not been attentive to my tunerview when I got off the dyno who knows what might have happened had I kept driving it the way it was.
Special thanks to Mase for the phone support
Crisis averted, problem solved.
After I did the valve adjustment, I mistakenly put the pcv line going to my catch can over the top of vacuum line going to the FPR.
Here's a pic to show what I'm talking about:Its fixed in this pic, but imagine the PCV line directly on top of that line and that's how it was. That PCV line is very beefy. It pinched the vacuum line on the FPR and wasn't allowing it to see full vacuum, which in turn threw off the tune.
I turned closed loop back on and its working spendidly. Our winter temps just kicked in recently down here in FL so its going to take some cycles to get my trims right to eliminate the remaining small amounts of knock (which is very very little).
Watch those vacuum lines and pay attention to knock your knock count fellas. Had I not been attentive to my tunerview when I got off the dyno who knows what might have happened had I kept driving it the way it was.
Special thanks to Mase for the phone support
Registered User
Joined: Oct 2006
Posts: 2,507
Likes: 0
From: Westchester NY
Originally Posted by spectacle,Dec 3 2009, 09:43 AM
Not partial throttle boost. I'm talking just taking off from a stoplight type of load. AFR's are supposed to richen up to a certain point, instead they are leaning out way too much which I'm sure is the cause of the knock.
I'm not doing pulls and pulling plugs. I don't have the time nor the patience to find open road to tell me what I already know - the motor is predetonating. I've verified its not the tune. Nothing has changed in the map or kpro since before the dyno besides what I stated initially.
I'm not doing pulls and pulling plugs. I don't have the time nor the patience to find open road to tell me what I already know - the motor is predetonating. I've verified its not the tune. Nothing has changed in the map or kpro since before the dyno besides what I stated initially.
Registered User
Joined: Aug 2009
Posts: 876
Likes: 0
From: Richmond, VA
Originally Posted by spectacle,Dec 3 2009, 09:43 AM
Not partial throttle boost. I'm talking just taking off from a stoplight type of load. AFR's are supposed to richen up to a certain point, instead they are leaning out way too much which I'm sure is the cause of the knock.
I'm not doing pulls and pulling plugs. I don't have the time nor the patience to find open road to tell me what I already know - the motor is predetonating. I've verified its not the tune. Nothing has changed in the map or kpro since before the dyno besides what I stated initially.
I'm not doing pulls and pulling plugs. I don't have the time nor the patience to find open road to tell me what I already know - the motor is predetonating. I've verified its not the tune. Nothing has changed in the map or kpro since before the dyno besides what I stated initially.