Brand new GMPP LS376/480 crate (LS3 with hot cam) hard to start when warm
Hi,
I have just swapped an LS7 for a brand new LS376/480 from GMPP in my AC Cobra before it was sold. I also bought the GMPP controller kit to get it to run. I re-used all the wiring and mechanical surrounding parts from the LS7.
After the swap, I noticed some problems to start the car when the engine was warm. Cold starts works perfectly and once it's running it also runs perfect. But if I stop the engine when fully up to running temp and then try to start it after a few minutes it needs several revs on the starter before it ignites and fires up, which it does in a slightly hesitant stumbling kind of way. Same thing here, once it do start up it runs perfectly.
I never had any issues like this with the LS7, it always started more or less immediately regardless of temperature.
At one point, I provoked the new engine and made several startups after each other, and roughly at every second one it started immediately and the other ones it needed a few more seconds on the starter.
The most embarrassing thing was when the new owner picked it up, it started at once and then he left but called me some 10 minutes later when he had stopped and shut down the engine to open his garage and then it wouldn't start at all. I went there and it runs fine on the starter but never fires. Then we left it sitting there for a couple of hours to cool down and tried again, and bam, it just starts immediately.
At this moment, I have not been able to connect my HP Tuners due to some computer issue but I'm hoping to have it resolved shortly. However, it did not throw any CEL or so and no error codes were present when using a stand alone OBD2 reader.
Any suggestions or ideas where to start with this?
