Taphee6

iTrader: (2)

I am really confused. LTB2 is running 10.5 at idol while LTB1 is 0 to -2 in park. When I give it 5% TPS LTB2 goes to 5.5. Drop it in gear and LTb2 goes to 4 and LTB1 is -2. I changed the 02's-nothing. Checked the entire exhaust system-nothing. Now what? just to make sure +10.5 is lean correct.
Can this be from a 236 595 112 Cam on an A4?

Another_User

Vacuum leak maybe? Maybe a bad injector. Check simple things first like vacuum lines, plug wires, spark plugs. If you have some logging software check for codes (there may not be any...yet). Log misfires and see if you have a specific cylinder that is not firing, or maybe an O2 sensor that is having problems. It could be a lot of things.

Taphee6

iTrader: (2)

I changed both 02's, looked over the vac lines, coil packs and plug wires are showing spark with a spark light. I'll pull plugs to see if they are fouled. Is +10.5 rich or lean and can this damage the motor if it is just at idol.

MECHAM

iTrader: (4)

+10.5 means the car is lean and the ECU is adding fuel to compensate

Taphee6

iTrader: (2)

So if the ECU is adding fuel to compensate, it is adding fuel to both banks correct? That would mean I could have an issue on either side.

MECHAM

iTrader: (4)

looks like there is something wrong with that side.

do a ecu reset and see if that clears the problem

do you have any reason to suspect engine failure?

Taphee6

iTrader: (2)

I don't think it is engine failure. The car is running real strong. I did just reset the valves (adjustable) they were way off and the compression was real low (165 before set and 195 after). For a ECU reset, I disconnected the battery and touched the cables together for 30 secs. no help.

Another_User

You can reset your computer that way? Just because it says you are lean doesn't necessarily mean you are lean. Some sort of logs would be nice. I suppose a valve being improperly adjusted could do something like that... Anybody out there know if that would happen with an improperly adjusted intake valve? But I would expect backfiring through the manifold along with it.

Taphee6

iTrader: (2)

I took it out for a cruise tonight and it is only running lean at idle in Park and N. At a cruise LTB2 is at 3 to 4 and LTB1 is -2 to +2. There is no backfireing, no codes, and no misses in the motor. It is really weird in Park and N as soon as I let off the gas LTB2 goes right to 10.5 and will go as high as 16.