ok i did mass air conversion on my car, i made sure i did everything right, but know the car just idles like crap you go anything above 1000rpms its fine, before with speed density it was fine,and also when its sitting idleing like crap , then i shut it off and turn it back on it just runs for a second then dies, then i start it back up and runs but idles like crap, anythoughts?????????

 

Suggest you start by running a KOEO/KOER self-test, and check what the EEC-IV has to say. I know you say you did everyting right, but a couple of details to check:

- Did you remove the vacuum line from the MAP?
- Did you do the thermactor pump pins move in the ECM connector?

Let us know what codes you get. GL

 

ok key on test got 95 which is probley fuel pump cause i didnt hook up that wire yet will though, running test i got 12.21.41.91

 

I never hooked up the fuel pump wire either, Mine idled fine, Did you reset the computer? Adjust the TPS and the throttle spring.

 

mine you cant adjust the tps, and reseting the comp just unhook the battery for a bit and hook bat back up

 

KOEO code 95.....you already know.

12: Cannot control RPM during ER Self-Test high RPM check
Suggest you do the base idle/TPS calibration first and re-test. If the problem continues to show up, there could be a problem with the IAC.

21: ECT out of self test range 0.3 to 3.7 volts.
This one could have showed up because engine temp was below 185°F when the self-test was run. Need to make sure engine is up to op temp.

41: No HEGO switching detected always lean (right side) + 91: No HEGO switching detected always lean (left side)
Check and make sure the O2's ground wire is hooked up and no contact problems are there, check continuity to ground from pin 49 at the ECM connector, ECM disconnected...if you get anything over 5 ohms, need to check for an open or a contact problem. If these codes show up after doing the TPS/idle setting.......more tests would be required. GL

 

ok set my base idle and checked some wires out and know iam just getting 41 and 91 codes, so that saying my engine is running lean?

 

is it possible my 02 sensors or sensor is bad?