View Full Version : Need help with codes on modified car?

07-14-2003, 06:25 PM
I have all the bolt ons on my car with 42lbs injectors and a 255lph fuel pump. My car does not like to idle right almost all of the time. When i give it some gas in neutral it hesitates and i can see some black smoke coming out of my exhaust. Also somtimes when i first start accelerating in the car it seems like the car is hesitating or missing but then it goes away. i had the codes pulled and got a 121- closed throttle position out of range and a 511- PCM ROM failure. Also a couple of weeks ago i had a custom chip made for my car by jerry. Any help?

07-15-2003, 12:27 PM
I'd contact Jerry and see what he thinks. It sounds like it's running rich. But the guy who made the chip might have some more ideas for you.