havent found it yet. ran new grounds, fixed all questionable wiring under the hood, got new distributor/cap/rotor and coil along with another control module.

it wont even attempt to start on its own but will try with carb cleaner. next step i guess is swap out the ignition switch under the dash and check out the neutral safety switch thing.

back of my mind still says its some sort of theftlock thing or security, but i cant verify or get anymore info. everything im finding says the blazer didnt have it in 95 and yet my symptoms completely match a security issue (short injector pulse followed by nothing and a code 1351)

 

A code is indicating a problem. I wouldnt just ignore it.

P1351 - Ignition Control [IC] Circuit High Voltage

Is that the only problem NO start?

 

trust me, im not ignoring it.... im just at a loss and frustrated. the 1351 is the only code its giving me. i lost the roof of my shop in a tornado in may and surprise... not enough insurance to fix it so with this heat ive been limited in the time i have to work on it.

looked at your link and will print it out and see what i can find as soon as the heat and bugs will let me get it done.

I appreciate your help.

thanks

 

code 1351 is gone but still no injector pulse. It's a crapshoot but ill try the ignition switch next since I have a spare. Im about to give up on it and move on.

As far as the injector pulse, is there supposed to be voltage on both wires at the harness? black wire reads 11 something and white one reads 9 something with key on and dmm - on battery.
In my mind there should be volts on one, comp grounds and + flows through.

 

ok ive been all over the net and read so many posts and problems that im now confused.

maybe one of you can point me in the right direction. here is where we are with this problem child.....

new dist, cap, rotor, cam sensor (wife brought home against my advice)
new coil
new control module
new crank sensor
new spider primes to 62 drops to 58 in a couple min
ran new grounds and all are testing good.
finally have NO codes.


WHERE do i start in checking this NO injector pulse problem. She wants to throw another computer at it but im not convinced it could be a wiring problem.

btw i put the ignition switch on back burner... but if anyone thinks its possible i will swap it out! I've GOT to get this running PDQ.

any help?

 

Your 1996 PCM won't work without reprogramming it.

Your 1995 vehicle uses the "Speed Density" fuel injection parameters to run, there's no Mass Air Flow sensor. Relies on +4 volts from the MAP sensor to computer showing there's vacuum while cranking to create the fuel curve.

In 1996 the Mass Air Flow sensor was added and the computer doesn't use "Speed Density" to pulsate the injectors. BUT you can get the 1996 PCM re-programmed for "Speed Density" to get it to work on your 95 if you wanted to.

So your 1996 PCM would never have ran that engine. Hopefully you've been using the 95 PCM all this time. And if it isn't working, try another computer.

 

Hey Presti. No Im still using the original pcm. I thought about the difference in fuel injection and the maf sensor and decided not to try it. Im stuck indoors because of rain the last 2 days, and some other business but want to make sure i test the wires b4 i spend money i dont have on another computer.
The wall I hit is I dont have a good wiring diagram that shows pins at pcm and whatever my be inline between there and the injector.
I think I read use B+ at pin (blah blah).. dont have info handy and a test light at injector harness (both sides) to determine if wiring is ok and its bad pcm.

when rain dries up ill get back at it.

 

Does the 95 have a ground wire on the thermostat housing area? From what I've been googling that is the PCM ground.

Ya didn't accidentally hook that wire to the back of the alternator did ya during the engine swap?


There was 2 different systems in 1995 on these...I've been trying to find an injector wiring schematic for you, there is this one:

1995 chevy s10: v6..the two injectors, regulator, relay..fuel pump - JustAnswer

But that shows a Red and White wire as HOT for the injectors. No black wire to the injectors. In 1996 they switched to 6 Pink wires feeding hot to the injectors.

 

ive seen mention of that ground on thermostat housing before.... my pcm is grounded at the frame and at the back of the head. the only wires on the alt are the plug and the red wire on pole to batt. i found a diagram i think is right, but the wire colors dont match at the injector. im guessing someone has replaced that wiring at some point before me. its still cold and wet here this morning but when it dries up ill get back to investigating/testing.
the thing i find odd is i have voltage on both sides of the injector harness. im thinking the pcm is stuck or shorted, just want to make sure the wiring is ok b4 i spend more money i dont have right now.

 

traced wires backwards from pcm and found that 2 identical connectors were switched around. the one for injector was missed because of the dirt and grease hiding the wire colors.

still have to button up a few details but should be on the road monday to the tag office.