sjcrft19

iTrader: (2)

Quick question , I did my71 nova lq4 conversion and had my computer tuned by frost via mail order. but the psi harness required that I use a different maf and o2 sensors than I had from the 04 van . I got the car running with the new stuff but she is running really rich and the st fuel trims are through the roof . is it from a vac leak or do I need to get the pcm reprogrammed for the new sensors ? or where do I go from here

ps :I did do a head and cam swap while the motor was out and steve had all that info but I didn't know about the sensor deal with the new harness

Thanks,
Keith

thunderstruck507

iTrader: (18)

truck/van uses an 85mm MAF sensor with built in IAT sensor

cars typically use a 78mm MAF and a separate IAT sensor

Not to say there isn't a vacuum leak but if it was not tuned for the correct MAF sensor, it can cause the fueling to be way off.

sjcrft19

iTrader: (2)

the 04 3500 van maf is definitely smaller than the one that i have now (from 02 tahoe) I Think I answering my own questions .. unless I rewire the old maf into the new harness........

Ed Wright

iTrader: (1)

Knowing which MAF you had to use, providing it is not what it was tuned for, your tuner can fix that for you.