Ok guys, i am almost ready to get her on the road but i have a bit of a problem with my engine. When we first started it up it ran like ****, backfired and popped a whole lot, when starting it it would shoot a flame out the intake, the next day i adjusted the rocker arms and the flame out the intake thing was solved but the popping and backfiring still was the same. Backed off the rockers about a 1/4 turn and everything was a whole lot better but the backfiring was still evident at very low RPM, like 800 and below when it was trying to idle. The car has a mail order tune on it for a 224/234 538/545 on a 110 cam (custom grind) and 30 lb injectors, along with a few other things like deleted o2's, AIR, EGR, and 4.10's. Well we adjusted the throttle plate a bit so it like adjusting the idle air screw and it helped a little bit, but we let it sit over night and come back and it runs like complete **** again, not as bad as the beginning but the popping is back and it doesnt want to idle. We have a hunch that it might be the tune being too lean and thats where the popping is from, we were going to put it on a tech 2 but my battery (which has held up galliantly thus far) finally went out after all the starting it had been doing. You guys have any ideas, there is a SES light on but i dont have my EVAP system hooked up yet and that is the only emisisons im keeping. Any ideas would help, im hoping its just the tune since i can send him the computer again and have him tweak it just a bit, i dont understand why it happened in the first place since i sent him a copy of the cam card with the computer so he had all the information he needed to tune for it. What do you guys think?

 

anyone have any ideas?

 

Did you delete the rear o2's? You got OBDII?

 

definatley get a scanner on it, first see what codes it set, try to get a datalog if you can while starting it.

 

Yes and Yes, its a 97 car, and the scanner is definitely the first thing im doing tomorrow

 

Okay, just making sure. So yes, the scanner is the only way to find out without wasteing money.

 

Did this car run fine with your mods and then it went bad?

I would very carefully check the plug wires, even feel your way along each one end to end if you can. It sounds like a 6/8 problem.

 

What do you mean the 6/8 problem? And no its the first time its run since the rebuild and new cam and all, been about 4 months since its fired up