I have a 2002 camaro, 5.3, ls6 intake, ls6 cam, 4l60e, 80lb siemens deka injectors, 3 bar OS.
Two weeks ago I got all the wiring hooked up and it was ready to start. I spent all day trying to figure out why it wouldn’t fire up. I realized the spark looked like it might be kind of weak. Finally, I noticed that there was a ground wire in the headlight harness near the passenger side headlight I hadn’t hooked back up. I grounded it to the body, and the car fired up almost right away, idled, leveled out, and ran well. I was really confused on why a ground there would even matter, but just went with it after a frustrating day of trying to get it going.
I started the car everyday for the following week for a few seconds at a time. Last Sunday I was about to install the intercooler and the charge piping, figured I would start the car, and it would not fire. It had the same exact symptoms as when the headlight harness ground wasn’t hooked up, but was still getting spark.
I could not get the car to start since then. When I crank it over, once every 20-30 seconds of cranking it gives a slight hope like it might fire up, but will never actually go. I posted my tune on HPtuners forum and a guy took a look at it and noticed some things I had wrong. I made those changes, but still will not fire up.
The fuel pump is coming on, there is fuel pressure at the little valve at the end of the fuel rail, I’ve check for spark on both banks, I’ve tried spraying starting fluid and fuel into the intake…nothing seems to change anything.
I’m really lost, the car was running well 2 weeks ago. Nothing changed that I’m aware of, and now it won’t fire. After the ground issue, I ran an additional ground from the battery, to the body, to the block, and nothing changed.
I’ve played around with the tune so much I don’t even remember which one I had in there when the car did start. But the one attached is copied over from someone on hptuners and should be a pretty good match for what I have in the car, but it still will not go.
I tried to upload the tune, but the forum would not allow the file; not sure if anyone on here uses HPtuners anyway. But if anyone knows what they’re doing and is willing to take a look I could email it.