theTDIguy
02-15-2009, 11:50 AM
Balance rate Question,
I have 2 LB7’s that knock; neither is warranty due to being swapped into SUV’s. With the Predator I see #4 on the burb (134K) is @ -6.20 or more when warm and in gear, the knock is very noticeable but tolerable and the engine seems to run smooth. On my second motor I get a reading of -7.50 on # 2 and it has a definite misfire that seems to fade up around 1200 rpm or so. If I’m correct in my understanding, doesn’t this negative # mean fuel is being removed from the firing event? The second engine knocks so bad you would think a rod is about to let go. I did inadvertently unplug an injector on my LLM a while back it knocked and misfired the same way but that would be lack of fuel right? Can to much fuel case a misfire too? Seems logical, this all started yesterday after twisting the piss out of the second truck with a Diablo 85hp tune, did I trash an injector? Could the tuner have done it? I checked the rates the day before and they were all within .75 +/- and only have about 2500 miles on them after being replaced under warranty prior to the swap. I doubt there is anything mechanical wrong as the motor never turned over 3500 rpm and I drove it straight home as I realized I had just broke my toy. Any thoughts?
I have 2 LB7’s that knock; neither is warranty due to being swapped into SUV’s. With the Predator I see #4 on the burb (134K) is @ -6.20 or more when warm and in gear, the knock is very noticeable but tolerable and the engine seems to run smooth. On my second motor I get a reading of -7.50 on # 2 and it has a definite misfire that seems to fade up around 1200 rpm or so. If I’m correct in my understanding, doesn’t this negative # mean fuel is being removed from the firing event? The second engine knocks so bad you would think a rod is about to let go. I did inadvertently unplug an injector on my LLM a while back it knocked and misfired the same way but that would be lack of fuel right? Can to much fuel case a misfire too? Seems logical, this all started yesterday after twisting the piss out of the second truck with a Diablo 85hp tune, did I trash an injector? Could the tuner have done it? I checked the rates the day before and they were all within .75 +/- and only have about 2500 miles on them after being replaced under warranty prior to the swap. I doubt there is anything mechanical wrong as the motor never turned over 3500 rpm and I drove it straight home as I realized I had just broke my toy. Any thoughts?