After cam install and some ls1edit tuning , my car has a hard time on the highway in overdrive locking up. Sometimes it wont lock and other times it takes forever and a day to lock. The guys who tuned my car says that just the way it is with an A4 car. thats one of the things that come with a cam install. Is that the way it really is and there is no fix so I just have to accept it and drive it that way.

 

you are getting random misfires which cause the converter to unlock. delete the random misfire and your lock up will be fine.

 

Would that show up on a engine code or not.

 

Depends on how you have it setup. Ditto on deleting the po300.

jeremy formato

 

turn your misfire detection down, and it will work fine...

 

Ok hes the deal the misfire codes are turned off , I talked to the tuner. What else can it be.

 

It is NOT the PO300 code. It is actuall misfire detection. For me, I just disable misfire detection completely by rasing the enable/disable temp up to 141/142 C.

I was the first to find/fix this issue back about 2 years ago.


Ryan K.

 

Yep, see above!

 

son has y2k 5.3 with MW 3400 with 2.2 STR with LS1 HOT CAM , local trans shop try for a week to correct lockup problem, GM dealer try for day and 1/2 to correct did reflash pcm , still TC would lock up -unlock, some time never lockup, We set misfire detedtion @ mim-139,max=140 now last 6 months NEVER a problem

 

Thanks everyone for the imput, heres what my tuner did see that the misfire dectection was already turned off, he started with new normal shift tables and turned my torque management down to 4 degrees and adjusted my 3 to 4 shift to 45mph my converter locks now,he says it possible that maybe one of the parameters on the first table didnt take or possible something was just maybe screwed up , But all is good so far .