why is this? Anyone else had this?Sometimes it will other times it wont want to. We had to disconnect the lines for the install but everything was put back as it was.I had to add some fluid back in but the fluid level looks good while idling. Also the tranny temp has gone up as well. It used to stay around 125ish just normal driving, but now its around 150. Anyone have any ideas?

Brian

 

Put in a decent sized tranny cooler, it will help on the temps. As for the lockup problems, dont know to much to help on that.

 

I would check and recheck the fluid level, the stock A4's are picky as hell sometimes. Other than that not sure. Those temps are nothing to sneeze at, mine at cruise was 189*F.
Thinking if the P0300 Misfire code, but it would only keep your TC from locking unlocking that I know of. Maybe MAP issues, if the cam is pretty decent in size, it may need some tweaking of the Min Max MAP Values.

 

ive checked and rechecked and checked fluid again after driving and everything. it has the biggest B&M cooler on it. The lines look fine, no pinches or kinks, ive leterally NEVER had any problems with it, it has a decent tune on it so no SES lights or codes. It was literally fine as of driving it into the garage the night of the install.And whats so puzzling is the fact that it sometimes it does it, sometimes it doesnt. I dunno what the deal is.

 

go ahead and add that... when he drops it down to "D" and then puts it back to "OD" it will lock then

 

id check for dtc's i had a smilar problem after my h\c swap it was fixed after resolving a po121 dtc... to me this prob sounds almost the same iexcept my tranny didnt wanna downshift randomely and trans temps were also up .. since i fixed the car from throwin dtc ive had no more problems

 

it has a tune on it and no SES lights or DTC

 

I think this may be misfires suppressing TC lockup, not
failure to go to 4th. You can get a low level misfire action
that will bother the TCC lock but not flash the SES light.
I did, after my last converter swap, and got rid of it by
jacking up the misfire thresholds after a week or two of
trying everything else.

 

I second that. I had the same issue after installing my cam. Raising the misfire thresholds fixed the problem for me.

 

where are the misfire thresholds in the tune? Under what section?