tonygia

I have a 1990 Firebird, Trans Am, GTA. In the last 7 years it has been going through some major changes. Generally, I have converted it from a 5.0L automatic to a 5.7L, 6-speed. The overhaul is almost complete, however, I have run into a problem with the ECU. The current ECU has an Hypertech chip installed in it. I do not know what the characteristics of this chip is as it came with the car when I bought it. Needless to say, this chip does not like the 5.7L engine at all. I can start the car but the cold idle is rough and the hot idle is rougher. I am considering replacing the existing OBD1 with an OBDII ECU which would allow me to program the parameters or even replacing the existing ECU with a stand-alone ECU. I am not sure which is the best method and was wondering if anyone can provide some background to either of these options.

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ParkerTPIz

try reposting this or asking someone in the DIY PROM or DFI and ECM sections u may have better luck there

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1986 Berlinetta-(1st car, 1st thirdgen, MX0, L44, hardtop)
1991 rs-medium quasar blue (L64, CC1,MM5, v-8 swap)
1991 rs-red (L64, MX0, hardtop)
1989 rs-gun metal grey (LO3, MX0,hardtop)
1991 z28-red(CC1, automatic LB9 TPI, MX0, D81)
1991 formula firebird- red (WS6, LO3, MX0 CC1)
1990 rs-black (project car, z-28 clone, hardtop: freshly rebuilt 5.7 L98, MAF TPI Automatic, Hedman Shorty Headers, 24lb LT1 injectors, SLP Loudmouth I, 16" Boyd Coddingtons, Dropzone 2" lowering springs, Smog delete, AC delete, Poly torque arm and trans mount)

Scarred for life.....

My PAYPAL is scuba9_steve@hotmail.com