Bank 1 ltft high
Bank 1 ltft high I just did heads and cam on my ls1. As stated bank1 ltft is higher than bank 2. I have hp tuners and working on tuning it but I am new with it. I did have a couple codes pop up, bank 1 02 sensor and a multiple misfire code. I'm gonna scan all cylinders tonight to see if I can find which cylinder it is. Also it could be a vacuum leak so I'm gonna check to see how much vacuum its pulling at idle. Does anyone know how much vacuum it should be pulling at idle with a tick performance sns stage 3 cam? Is it normal that bank 1 and bank 2 ltft's read different after a cam install until it's tuned? If I do have a cylinder misfiring on bank 1 could it cause the 02 sensor to pop up a code? Thanks
Erik
Erik
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Joined: Aug 2010
Posts: 7,323
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From: Ann Arbor, MI
How big is the difference?
Seems an O2 sensor problem would directly result in LTFT errors.
A real misfire will allow unburnt oxygen to register on the O2 sensor as a very lean condition, perhaps leading to a O2 sensor code and LTFT imbalance.
If the PCM has not been tuned for that aggressive cam, I think you should start there.
Perhaps after a quick check for vacuum leaks.
I'm not an expert in this area, so lets see what others say.
Seems an O2 sensor problem would directly result in LTFT errors.
A real misfire will allow unburnt oxygen to register on the O2 sensor as a very lean condition, perhaps leading to a O2 sensor code and LTFT imbalance.
If the PCM has not been tuned for that aggressive cam, I think you should start there.
Perhaps after a quick check for vacuum leaks.
I'm not an expert in this area, so lets see what others say.
Big cam is going to be setting false misfires especially at low rpms.. Misfire strategy is looking for smooth crank rotation. That all went out the window with a lopey cam. Not saying you don't have real misfiring going on. Just don't rely too much on what the misfire detection is telling you. Your O2 sensor code might be a better clue or a data log showing what the trims are doing.
