Hey that's a pretty nifty! I didn't know you could do that! I followed your instructions and it works. There is a ckicking noise from the injectors when I jumped the terminals...I hope that's normal. I pulled a 15, 33, and a 45. I found a code site on the net
http://www.troublecodes.net/GM/89-90_57k.shtml and here's the explanations...
15 Coolant temperature sensor signal indicates a temperature colder than -27° F for 30 seconds after the engine has been running for at least 30 seconds.
33 MAP sensor signal voltage was too high (low vacuum) for 5 seconds when throttle opening was under 4%.
45 Oxygen sensor voltage was over 0.7 volts for 30 seconds of closed loop operation with a throttle angle between 2% and 20%.(Rich Exhaust Indicated)
I cleared the codes in case they were old, started it back up blowing soot all over anything in my garage that was in the line of fire of my tailpipe, shut it off and checked again. This time I only got the 33. Problem is I don't know what to do about it. Could it mean a bad MAP sensor? The guy at the parts store said 60 bucks for a new one and I can't be sure it's the problem or maybe a vacuum leak or something else. I don't even know which sensor it is. Is it the one with 4 wires (all with green in them) that screws into the passenger side of the throttle body or the one with 3 wires at the rear of the engine?
I replaced the ignition coil with one off my old engine and no change.
Thank you for your much appreciated help!
Jim