So I put a GM Reman ecu in. Seemed to be what a few people on other resources had issue with when nothing else worked. Well we can put that down as another thing that is new but didn't resolve the issue. I'm at my wits end here. The new ecu seemed to run smoother in the beginning as it learned its idle. Once warmed up I shifted to reverse and let it settle on idle there. Put back in park and Idles to 1000-1050rpm. Not as bad as before but still not right. Took it for a ride and let it learn cruising and excelleration all seemed good as usual drivablilty is good. Stopped and back to park and 1000-1100rpm. Turn key of and start back up 750rpm perfect. Back in gear and to park. 1000-1100rpm. WTF? Had a friend of mine who is a tech drive it. Did some slow and faster start stops and restarts. Same thing. But then we get back to my shop and he's playing back and forth to gear and p/n and it starts missing ever so slightly in gear put it in park and it revs to 15-1600rpms then settles around 12-1300rpms. and is running a bit rough. SHut it of and restart. 750rpm and purrs like a kitten. Any idea what could cause this? Is there a intermittent fueling problem that is making the IAC stay open cause its rich?
I rebuilt the tbi and put new screens on the injectors. At idle the cone of fuel looks good no drips no weird pattern. rev it up all looks good. Maybe different under a load?
Sorry for the long rant. Just throwing it all out there and hope someone has an ah ha moment that i'm not considering.
I rebuilt the tbi and put new screens on the injectors. At idle the cone of fuel looks good no drips no weird pattern. rev it up all looks good. Maybe different under a load?
Sorry for the long rant. Just throwing it all out there and hope someone has an ah ha moment that i'm not considering.