94blackonblack

Ok guys I'm sitting here a hour and a half away from home at a campground with my family I drove my 95 lt1 m6 to the flea market here got back in the car to leave and it wouldn't start messed with it a bit got it running and made it back to the camp ground let it set for 10 mins and it wouldn't start again I have codes 18 and 36 pulse high resolution failure and injector circuit problem right now I'm looking at the ignition module but can't remember if that helps with injector pulse sorry for the long post I only have my phone and am kinda stuck here could I maybe have a bad icm temp sensor or just a bad injector?

GaryDoug

My guess is the ignition switch, since one section controls the injector and pcm circuits both. It seems unusual to have 18 and 36 at the same time otherwise. Try putting a jumper wire from battery positive to the top of fuse 9 (7.5A), 10 (7.5A), or 11 (10A) in the underhood fuse box while cranking.

94blackonblack

Like the resistor in the key ? I did notice it takes a second for the theft light to shut off but I don't remember if it came on when it died comming up to a stop sign but I dumped the clutch and it started right back up I remember my 94 would do that it left me sitting before untell I bypassed the vats maybe a ignition relearn ?

94blackonblack

Or the switch lower in the column?

GaryDoug

The ignition switch at the bottom on the steering column. Just a guess though. Did you try the jumper?

94blackonblack

Not yet were all laying down and I don't have access to any wire I'll have to get a ride out to Walmart to grab some wire I appreciate all the help y'all have given me I shoulda just kept my cobalt ss but I love these 4gens way more

94blackonblack

It's looking more and more like a heat soaking failure of either the opti or the icm the guy I got it from said he put a new icm and coil on it maybe he diddnt use enuf grease or he used some kinda grease that doesn't hold up good probly only about 160 miles on the icm and this is what it was doing before he replaced the coil and icm this is the first trip it has been on and it was realy hot the day I came up here

94blackonblack

Ok I did the positive wire to the three fuses in the under hood panel when it didn't wanna start and it didn't change anything still didn't start what does this mean?

Injuneer

You sure the second code wasn't DTC 16, and not 18? That would explain why it's not starting.

94blackonblack

no it was 36 and 18 just double checked i did notice when i crank it when it doesnt start the oil pressure is at 0 and it says check gauges now i can crank on it for a few seconds and the pressure shoots up im thinking oil pressure switch ? doesnt that controle spark and spray if it doesnt have any oil pressure that would explain the codes were is the oil pressure switch and will a 97 silverado switch work?

GaryDoug

It means the ignition switch is ok.

The oil pressure has nothing to do with a non-starting condition. Only on older Camaros and Firebirds was that the case.

If the distributor was outputting very erratic and high frequency "noise" on the low res line, that could cause the code 36 and the non-starting condition. I don't know if that could cause the code 18 though.

94blackonblack

It actually kills the pump after primeing to save the engine it will start after about 20 seconds 35 max

GaryDoug

It doesn't stop the pump to "save the engine". It stops because, until the engine starts, it isn't needed to run.

Injuneer

It's normal for the pump to prime for two seconds, then shut down. The pump only starts again when the PCM gets the cam position signals from the Opti, while the starter is cranking the engine.

94blackonblack

Ok well this was the problem this time I'd like to boot the little ****er in the head for alot of **** he did that was very wrong and he knew it but did it anyway