TPITuned Port Injection discussion and questions. LB9 and L98 tech, porting, tuning, and bolt-on aftermarket products.
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Hey, I got some problems. I have an 89 Iroc that I swapped a L98 out of a 1988 GTA into. It was running fine for the last 1200 miles but now when you start it backfires and misses. It's not every time you start it. It seems to be every second time. The idle is all over the board. 800 to 2500RPM hunting up and down, you can't even drive the car. I went ahead and put in a new GM Distributor Module, distributor, coil, fuel pump, fuel filter and tried another ecm. I have checked the timing and everything is fine. The interesting thing is that if I disconnect the wire to check the timing the car runs fine. No backfiring or missing at all. Now you couldn't leave it like this but at least it will idle and you can move the car around. I'm lost on this one...maybe try the ESC module? The wiring harness could be shot I guess but why would it run fine when I disconnect that timing wire Any help would be great.
z28redline
__________________ 1986 z28 Camaro - LG4, Dual snorkal air cleaner, Wonder Bar, 36mm hollow front sway bar, Custom STB, Belltech drop Spindels, Koni Reds, 17x9.5 Vette rims... “Love is the delusion that one woman differs from another.”
Re: 88 L98 problems, Backfiring, Missing and Hunting
well if you disconnect it thats base timing, which is about 6 degrees, sounds to me like a ect issue of some sort and the ecm is changing the timing incorrectly for some reason
Any help would be great.
