abustiffy

Im using tunercat on an 85 corvette. The car has 30lb/hr injectors, mild cam(not positive on specs atm), and ported intake. Is there an injector constant in the code or should I make the changes elseware? I have tried the display fuel flow rate constant to find NO changes in afr. Any help for this and other advice would be greatly appreciated.

Update.

I changed the injector pulsewidths and got the air fuel a lot closer to where it should be(~14:1 idle) via wideband the issue is the car generally runs bad. I checked timing and compression, everything appears within spec. the compression causes a bit of concern though. ranging from 155 to 145. This is supposedly a fairly fresh motor. The car also backfires. even at idle or no load reving it will pop. before the tune the car would idle in the 12:1 range but the plugs still didnt really look bad, they actually indicated a fairly good runnign motor. Now they are about the sale but 2 of them are a little more black than the rest. The only modifications I have made to the tune are IPW and idle speed. Im pulling my hair out on this one.

abustiffy

bump

3.8TransAM

Might want to look at upgrading the ecm to the newer 165 as you have a lot more support and $32b and $6E to choose from.

I know they have an inj constant and scalar tables and have been thouroughly dissected via hac, etc.

Don't know what else to tell u as I am wholey unfamiliar with the factory 85 MAF ecm/code.

later
Jeremy

abustiffy

I really dont think it is an issue with the ecu at this point. After new plugs, Im putting 24# injectors back in and trying it. I would just like to figure it out before going through the headache of changing the injectors if I dont have to.