Hard start condition with 5.7 in 2000 S-10
First, thanks to everyone who helped me get this far. It's really opened my eyes to the potential of this software! I've gone a long way in the last couple of weeks!
I've put a 1998 Vortec 5.7 into my 2000 S-10, and I upgraded to the 0411 computer. With regards to the engine, the only major change to stock I made was the installation of a Comp Cams Xtreme Energy Kit (includes all valve train components) and a custom exhaust with Hedman Headers. It is otherwise stock.
I have a small problem with the truck engine only at start for about 10-15 seconds. It starts right away, but the RPM's fall to a near stall condition, and it revs up and down from normal idle to near stall for about 10 seconds. I can give it gas to bring up the RPMs, and it usually evens out pretty quick.
This 0411 computer was already from a 2002 Chevrolet Express with a 4l60e, so it was a direct swap in. I had this start condition with that tune, but since several Serial Data items weren't working (PRNDL to name one), I made a custom tune that came from a 2002 S-10, and then put the 5.7 data from my original 0411 PCM into that tune. I changed a couple other things (rear axle, transmission shift points etc), which fixed my Serial Data issues.
But the start condition persists. It's throwing misfire codes, but if I clear the codes after the engine starts, it's all good.
I suspect the issue is the camshaft. The Comp Cam's lobe lift is .325/.33, while the factory is .274/.287 The manual for the Cam says you will get the best results with computer tuning.
Can someone point me in the right direction to tune the computer with my engine setup? Is there a way to monitor what is happening and modify the tune to allow the engine to idle properly right from the start?
Thanks a lot for all your help!
Bill.
