Car issues...need help
Car issues...need help I also posted this in the LS2 section. I thought some of you guru's might know and answer.
Anyone done an LS2 swap into a 98 or am I the only one? If so, have you ran into any problems with the 98 PCM?
I recently did a LS2 402 swap into my 98 and we have been having issues with the tranny going into limp mode (we think, there's no other way to describe it). This is a built trans. There are no codes. The car has been datalogged with HP tuners and a Tech 2. At 1/2 to WOT the car will rev to where the stall flashes and pull no more. It feels like your towing a 2 ton boat anchor up a hill. If you turn off the car and then restart it the car is fine for a couple minutes and then does it again. Normal driving is fine. The motor will rev all the way to the limiter in neutral. Just about everything on motor and tranny are new.
At first we thought it was a tranny or converter issue, but after having the converter and tranny rebuilt, it still did it. We have done the following to chase down the bug: checked the tuning, retuned, replaced the MAF, TPS, put a different tranny in the car, checked all sensors, grounds, connections, and the wiring. Everything appears to be fine.
The only thing left to do is replace the wiring harness and PCM with 02 stuff.
Anyone have any ideas what the problem could be? Has anyone ran into a similar issue? Could it be a PCM issue?
Any help would be appreciated.
Anyone done an LS2 swap into a 98 or am I the only one? If so, have you ran into any problems with the 98 PCM?
I recently did a LS2 402 swap into my 98 and we have been having issues with the tranny going into limp mode (we think, there's no other way to describe it). This is a built trans. There are no codes. The car has been datalogged with HP tuners and a Tech 2. At 1/2 to WOT the car will rev to where the stall flashes and pull no more. It feels like your towing a 2 ton boat anchor up a hill. If you turn off the car and then restart it the car is fine for a couple minutes and then does it again. Normal driving is fine. The motor will rev all the way to the limiter in neutral. Just about everything on motor and tranny are new.
At first we thought it was a tranny or converter issue, but after having the converter and tranny rebuilt, it still did it. We have done the following to chase down the bug: checked the tuning, retuned, replaced the MAF, TPS, put a different tranny in the car, checked all sensors, grounds, connections, and the wiring. Everything appears to be fine.
The only thing left to do is replace the wiring harness and PCM with 02 stuff.
Anyone have any ideas what the problem could be? Has anyone ran into a similar issue? Could it be a PCM issue?
Any help would be appreciated.
The only electrical thing I can think of that is different that you didn't mention are the knock sensors. I have no idea if this is helpful or not, but when all else fails, back to basics.
Knock sensors, Cam Position sensor- what have you done to address these known issues with this swap? If you have addressed those issues did you perform a Crank Position Relearn? Overall, with the massive amount of effort you have into this project why settle for the inadequcies of the 98 OS? I would think that you would want the most versitle PCM for this formidble setup? At any rate if you come to your senses and chuck that 98 OS and need help setting up the newer PCM, PM me.
