yeah, its 1 95, obd1, good idea with the signature. The gm dealership scanned the car and saved it to a computer. The only code im getting now is the injector circuits code.

Before i replaced the opti (with a used one, prob a bad idea, i had these codes)

p0018 Injector Circuit(s)
26 Evaporative Emission (EVAP) Canister Purge Solenoid Valve Circuit
27 Exhaust Gas Recirculation (EGR) Vacuum Control Signal Solenoid Valve Circuit
42 Ignition Control (IC) Circuit (Shorted or Grounded Circuit)
47 Knock Sensor (KS) Circuit or Module Missing

I think i will change the opti again. Its a lot easier to start now than it was before, i find it strange that the exact same problem would result from two optis, but it seems like getting a new one is the only way to be sure.

 

You indicated that a 'noid light did not show injectors firing. You indicated that you have DTC 18 for faulty injector(s) circuits.... but your solution is to replace the Opti. You lost me - have you checked the injectors and/or the injector wiring? And the dealer logged your PCM, and they told you the RPM was spiking to 5,000RPM?

 

Dealer says they have checked everything, wiring harness, each wire to each injector, and all the "grounds".

Somebody indicated that a bad opti gave him an injector circuit code, and everyone says that if the pcm thinks the car is doing 5000rpm, its cuz of the opti. Dealer says the 5000rpm spikes (scanned car during startup) would make the pcm cut the signal to the injectors. To be honest, im confused as hell myself, i wanted to do a cam swap this summer

Everything seems to be working, but the injectors dont fire properly during startup. Even replaced the pcm, problem is still there. FOr some reason, its nto as bad as it was before replacing my oil + coolant soaked opti with the second hand one.

 

ON this note, is it possible that the pcm gets a different rpm input during startup than it does while the car is running?

Its really wierd that the injectors dont want to fire during started and for about 10seconds after startup, but that it runs fine after that. Its also wierd how the position of the key affects how the car runs immediately after startup, so that it runs find if its between "on" and "crank" whereas it runs bad if its in "on", for the first 10 seconds.

 

Did they check vats? Maybe youre switch is putting an open in the circuit?
Just some thoughts.

 

Perhaps your ignition switch is bad or mal-adjusted and it is killing power to the PCM. Notice anything else on the dash that stops working?

 

When i start the car and leave the key between the run and crank position, the vent fans do not run but the car runs

If i let the key go back into the run position, the car stops running but the ventilaion fans come on. I have to play with the key, wiggling it between the run and crank positinos before i get some backfire and the car starts running. After that, it runs fine, and pulls very good.

I have already replaced the ignition lock cylinder thing and the problem is still there. Is there another ignition component I can look into?

The dealer says i have 4 bad injectors, i was going to replace them anyway, but i find it very odd that fiddling with the key would have anything to do with bad injectors.

 

Yeah, the switch. If you have to fiddle with the key to make things work you have switch problems (either adjustment or switch, itself, as I posted before). The switch is not the key cylinder. The switch is on the steering column under the dash. There is a replacement guide on my Tech Page.

 

It was the switch!!!! Shoebox, youre the man!!
After changing the ignition switch, i have a few problems :S

1) I can start the car, but when i shut it off, its hard to pull the key back all the way to take it out.

2) My headlights are always on high beam, i cannot switch them back and forth between high and low beam.

I am wondering if i forgot to put back a connector. Right next to the ignition switch was a wide/thin black connector. I pulled it out for access, when i was putting it back in, i noticed the plug does not take up the entire slot. I could not a second plug to fill up the remainder of the space, but maybe it is there somewhere?