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Something I forgot to mention is that I connected the switched power wire to the battery with an inline fuse, the pcm sees battery voltage, that is no longer an issue.

I will do some more work on...

Update if anyone has and input: Contrary to everything that's said above, the injectors don't spray fuel at all when cranking despite the high ipw. The ipw does zero out when I push the gas pedal to...

When I can get it to run (for a second or two at a time), the injector pulse width is in the neighborhood of 15-20 msec with a commanded afr of 8:1. I did notice that in my scanner, the vcm reported...

99 3800 non supercharged, 4t65 transmission, 1999 Grand Prix ecm with a 1999 drive train.

Day 1: I recently cleaned up the wiring in the engine bay, and around the ecm. After that, the car would...

Now that you mention it, it does leak at the beginning of the downpipe. The exhaust is temporarily poorly put together. I'll do some cleaning with the MAF and IAC. Starter fluid hasn't revealed any...

ZZP Block off plate.

I have recently swapped an L36 into a Fiero and I think I am having some issue with the idle. It seems to fluctuate more than I expect it to. Is this normal for the 3800? It's my first one.

It's a...

bump

I just finished putting an L36 into my '86 Fiero, and I cannot get it to start. I believe it is the Theft Lock stopping me. I wanted to disable it with HPT, but I can't connect to the ecm enough to...

Using a combination of both methods, I got it to work. Thank you for the help.

In that list, there's nothing about HPT. Where else can I look?

I have absolutely no idea how to do this. I'm swapping form an XP computer to a 7 computer. I have the new drivers, and I've deleted the old ones. How do I implement the new ones?

I thought I would update the thread. I've been using a histogram I set up that adds LTFT and STFT together, then adding half the change to the ve tables. I've done it twice and the car is a LOT more...

I'll give that a try. Thanks for the tip.

From a Jbody ecm.

I have a histogram set up to monitor my fuel trims so I can make changes to my pe tables instead of using the wideband, they seem to be less extreme and make the car happier...

'02+ Cavalier going into an '86 Fiero if that helps.

I'm wondering how this would work. It's an OBD 2 motor and ecm going into an OBD 1 vehicle. I think I know how this would work, but I want to be sure.

Basically, swap over an entire harness and...

I have a Glowshift brand fuel pressure and oil pressure gauge. The gauges each have a signal wire that connects to the sender. Is there a chance, I can use this wire to get a signal for my scanner?

Your IPW Multiplier vs VAC table is backwards. That's negative pressure, not positive pressure. Reverse that and you should be better off.

Also, your idle ve table is way high. Reduce that back to...

Um I don't think it would work out so well, or a lot of other guys would have done it.

Are your 1000 cc injectors high impendence?

I'm working on an LS2 GTO and I'm unfamiliar with the ecm. Is there some kind of built in boost limiter in the ecm?

The car is a twin turbo with GT30's boosting at a max of 6 psi. Before we go...

A higher water mixture will help with iat's. A higher methanol mixture will yield more octane, so more timing.

I haven't noticed a significant change in my iat's in my Cavalier, but the octane...

Would that explain why my car seems to start differently with my tune compared to the gm reflash?

Now it seems like the car starts smoothly, but was more force behind the starting with the gm...

Left is an automatic. I think an '04. Right is an '03 manual.