Ok here is my problem. I swapped in a brand new vaccum HEI from summit racing a few weeks back cause my factory computer HEI was not advancing the timing corectly and i couldnt figure out why that was. No codes were being set but you could tell things were not right. It had accerlation that was not smooth at all for instance. Anyways i got the new HEI in there and got it all hooked up and now accerelation is super smooth and the whole car seems more zippy and timming is A-OK. But the car is running rich. I still have the computer quadrajet on the car and i am shooting up a couple codes. I think 12 obviously cause the car cant find the ole distibutor and that other one which i cant think of right now that has to do with the sigal the ECM gets from the ESC module. I think that the car is in limp home mode and has set the carb to one mixture setting and thats it. Is there anyway to fool the ECM into thinking the ole HEI is hooked up so that the thing will look at the O2 sensors readings and run at the proper mixture? Any ideas guys? I have been driving my Nova cause this thing has been getting like 12 or worse miles per gallon in town. And the straight six nova (1970) by the way three on the floor gets much much better gas mileage. Any help would be appriciated.

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86 Coupe with a ton of fact. options G80 (now with 3.43's)Four wheel disk, T-5, (now a world class T-5), T-tops
Mods- IROC Front and rear anti sway bars with energy suspension endlinks and i also added the wonderbar, No exhaust after the Cat though fell off and to cheap to buy a 3 incher yet so I have to be quiet. Fourth Gen seats now. LM1 350 Crate engine!!! Good no more LG4 evil bad naughty things. Still seem to get descent Gas mileage. All major computer stuff hooked up and running good.

 

As far as I know you need to macth the computer controled carb to a computer controled dist, You either should computer all the waay or take a step back and go the no computer route.

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86Z28, GM 350, Jet perf Q-jet & chip Dual snorkel air cleaner, Edelbrock performer intake, Edelbrock headers, Edelbrock cat-back, Off road pipe, MSD 6AL, Accel Super Coil, Taylor Spiro-pro wires, Rapid fire plugs, Jet fan switch, World class t-5, Hurst Short Throw Shifter, Ram Flywheel, Center force dual friction clutch,Aluminum drive shaft, BW disc rear 3.45's & a posi, PBR calipers, Earls braided brake lines, Polygrapite bushings all the way around, poly tranny mount & torque arm mount, Hotchkis lower control arms & panhard rod, Rancho limiter straps, KYB struts & shocks, Gm Wonderbar, Edelbrock strut tower brace, SSM sub frame connectors, Jamex lowering springs, Carbon metallic brake pads, Crossed drilled rotors, Mobil 1 Tranny fluid & motor oil, GM syntheic rear end oil, K&N, Grant stering wheel, 1,200 watt system, Jet Black Paint, 91 Z28 rims, 92 wing, Tinted windows.

 

Yep. Either both computer controlled distributor and carb, or both mechanical. You can't mix the two. The carb is in the full rich mode at all times because the computer isn't getting the distributor signals it needs to adjust the mixture. Code 12 just says the computer is working (you'll get that with everything working properly).

I'm getting 20 mpg commuting, 27 highway. Without a functioning TCC. 12 mpg is pretty good with full enrichment all the time.

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82 Berlinetta, orig V-6 car. Rescued w/86 LG4/TH700R with all harnesses, sensors, ECM, etc. 2.73 open. Cat-back from '91 GTA, Accel HEI SuperCoil. AMSOIL syn lubes bumper-to-bumper. Daily driver, work-in-progress (LB9 w/ZZ3 cam, exhaust, paint, etc.).
57 Bel Air, my 1st car. Currently 396 .030 over, Weiand Action+, Edelbrock 1901 Q-Jet, Jacobs Omnipack, 1-3/4" headers, TH400 w/TCI Sat Night Special conv & shift kit, 3.08 10-bolt, AMSOIL syn lubes bumper-to-bumper. Best 15.1 @ 5800' Bandimere. Daily driver while Camaro was being put together.

[This message has been edited by five7kid (edited October 16, 2000).]