all the parts im using are from 95. started with a complete one that had 2 dead cylinders, bought a complete engine from a 95 with the dist, coil n everything but the power steering pump n a/c.... the 96 is just sitting and getting parted out.
although i think a few of the parts are the same, i dont wanna play the maybe game.

Im ready to get this one done and out of my way so i can get my zr2 rebuilt and on the road again! machine shop said he would be done with his part like tuesday.

 

ok rechecked all the grounds on motor and frame.... all good. have ruled out ICM and have spark. triple checked timing and it will run with a shot of carb cleaner for a few secs. Also know the crank sensor is working properly. Holds 62 psi on fuel rail and has new spider.

still have NO injector pulse... the ground side has continuity but have no voltage. ive tried unplugging tps, coolant sensor... you name it!

starting to think the ECM got fried somehow.

dont have good enough wiring diagrams to really help me here.

ANY thoughts other than put it in the shop? (got $45 to my name right now)

 

here u on the money thing. sucks being working poor. do u have a pullapart junk yard bye u? see if u could get a pcm from them cheap.

i had a 1992 chevy truck with the same dist in it. i would have to change the thing every six months. those dist r junk. just a thought

 

Yeah got a couple salvage yards in town. Although..... I know it would be alot of work, but im considering just putting the 96 back together or just parting them both out and moving on!

I dunno, lots of crazy ideas in my head tonite

 

With the key off, use a multimeter and check the ohms between the battery negative and engine.

Now try it with the key on. How many ohms do you see on your ground?

Mine goes from 1 ohm- key off to 10 ohms with the key on. Does this mean a short or does yours show the same?

 

Ive never tried your method with the key on. with the key off you're checking the resistance on said wire or cable, but with the key on there is battery voltage travelling through said wire. The wire you are testing for ohms has a couple of factors that play into the reading youre going to get.. 1, how long is the wire and 2, how thick is the wire.

The way I was taught to check grounds is use your volt meter on dc scale, put red lead on bat + and black on the ground your checking. You should have close to same reading as touching red and black on battery.

In this case all of mine read a lil higher than battery volts. ie. batt shows 12.27... my grounds read 12.37-.12.42

so i didnt even touch the ole problem child for a couple days (was busy with other stuff) anyways, for grins today i thought eh what the hell, try n start it.... I got a short burst of gas and it actually tried to start for a sec and then went back to dead not happening.....

i dont know what to make of it. logic says TPS or coolant sensor putting it in clear flood mode but ive already tried that.

all i can say for sure is she has demons and is properly named "problem child"

LOL

hey i went ahead and used your method... might help you or leave ya stumped... anyways,

batt voltage 12.38
ohms key off .30
ohms key on 3.30

hope it helps ya. lord knows im still stumped on mine

was cleaning connections and rechecking voltage and grounds.... stumbled upon the cam sensor connector only having 10.7volts and not the 12.38battery volts. the ground still checks good.

does anyone have a wiring diagram for the 95 so i can trace this back and fix it??

thanks.

Thanks,

my no start blazer shows low voltage on the cam pink wire too. Lowest of the Pink wires, I get 11 volts.

I've thought of cutting every pink wire off the engine and running a new line to feed them. Mine is sparking fine, turn the key and it opens a couple injectors and begins to fire...then shuts everything down and sets 1351.

It won't re-open an injector until the 1351 is cleared....then process keeps running round from the beginning. There's nothing left to replace. Has to be wiring somewhere.

Painless Wiring has a new wiring harness for 96-99 Vortechs, but you have to use a 1997 PCM. The 1996 PCM is totally pinned different....and nonody seems to know the pins on it.

 

Think I found my problem. Ground wire for ICM module to PCM is shorted to a green and purple wire in the harness. With the battery negative disconnected and the PCM white harness unplugged I found the short ohming the black ground wire to PCM pin...also getting continuity off the adjacent purple and green pin outs.

If I use a separate ground wire to the ICM it almost starts. I think the other wires are hot shorting to the icm ground giving the PCM problems.

Got mine chugging. Woo Hoo!!

 

Hey glad you're making progress. Last night I had the idea of hitting the local library and seeing if they have any manuals with the wiring diagrams so headed that way shortly!

keep me posted on yours, and ill do the same.

library was no help. did however get wiring diagrams and pinout charts. after a lil legwork today finally got a good capable scanner tonight and we have decided 3-0 that the computer is bad.

a piece of interesting information.... the pinouts and diagrams are identical from 95-96 even though there were changes made! Unless I get told not to, im going to plug in the 96 just for ****s n giggles to see if it will run LOL

 

Good luck! It appears the late 95 PCM is called "PCM-a" and yep....appears your 96 PCM may work in a 95. Hope it fires up for ya!

Click thru this link and take a look at the 32 pin PCM pinouts, it's our PCM:

https://blazerforum.com/forum/2nd-ge...ead-all-19330/

 

wow that was a REALLY long read, but worth it. tons of info. So hows it coming with yours? sent ya a PM with some links to check out. Im gonna see if i can find another 95 pcm and then go ahead and compare the 95-96 physically b4 i just plug the 96 in. I know of 1 difference being that tuning valve on the top of the plenum on the 95....
they may be pinned identical but there will be differences. so hoping for a miracle or 3 today LOL

so far NO luck. after the sun peaks and i have a lil bit of shade im gonna pull the hood off and break out the diagnostics again.

Hate to say it, but the honeymoon is over between us and if she dont cooperate soon i will divorce this blue bitch! LMAO