EFI Codes

[Shwagy357]

I am running ryans harness on a 93 5.0HO out of a mustang. When I crank the engine and let it run the engine the engine has extreme up and down idle speeds. After I turned it off I got trouble codes 81, 82, 84, and 85. Are these codes normal? What would cause the strange idle speeds. I am thinking maybe the EGR valve which is not hooked up.

 

[69Bronco94]

Code 81 - Air diverter solenoid fault, intake air control circuit fault, air injection diverter

Code 82 - Air diverter solenoid circuit fault or supercharger bypasscircuit fault

Code 84 - EGR vacuum regulator circuit failure

Code 85 - Canister Purge Solenoid circuit failure

The strange idle could come from one or some of these. You should try to hook these up or if you can't, if you trace these wires coming out of the computer you can ground them out. There were a few sensors like the AC clutch and the power steering safty swtich I had to ground out because the computer was not getting any feed back from those sensors making it idle funny. Grounding these out should fix it