95 Blazer sometimes won't start

[95Blazed]

My blazer sometimes won't start after running for awhile and sitting parked. It started doing the not starting thing first, now it will run but cuts out between 2 to 3000rpm and will suddenly just croak will driving and won't start back up. I have fuel (replaced filter) got spark (pulled wire and got the snap in the arm to prove it)! I replaced the ignition coil, and even tried a little injector cleaner (why not). It will start up again after sitting for a couple hours but just croaks after it warms up good, HELP! Its gotta be an ignition problem, I would think? I'm new here, so let me know if I am too awfully confusing!

[BlazerLT]

search for CPI injector

[95Blazed]

It runs fine at idle, if its the CPI don't they usually run rough?

[95Blazed]

I just changed the cap and rotor as the spark was orange, now good blue spark, same problem. Can you tell me where the egr is on this thing?

[BlazerLT]

If it was the EGR, the engine would barely idle.

Remove the top vortec plate and the IMTV valve underneath it and look down into the plenum and look for washed spots where fuel has washed the normal black deposits away.

[95Blazed]

It looks kinda damp in there. There doesn't appear to be any washed spots though.

[BlazerLT]

So everything was thick with black deposits?

[95Blazed]

It appeared to all look evenly coated to me. This thing is frustrating! What about the fuel pressure regultor?

[BlazerLT]

That is on the CPI injector, it was the item you actually peered down onto when you looked inside the plenum.

Grab yourself another upper plenum gasket and remove the upper plenum cover and thoroughly inspect the whole plenum area for leakage.

[95Blazed]

I think you were right! I removed the upper intake and the whole passenger bank in the lower plenum was washed, the driver side was fine. I believe it is the fuel pressure regulator as it is on the passenger side and is notorious for going bad. I will try a new regulator and get back to ya. Thanks and nice Blazer you have there, mine is also a black LT 4x4. I just got it 4 months ago and have quite a few plans for it. Also my 4 wheel drive isn't working, its electronic. If I put it in 4 wheel drive it doesn't go in and when I go back to 2 HI it just flashes back to 4HI and a loud clicking noise comes from up front when I move. I put on a new vacumn actuator but again, same problem. The only way to get back into 2HI without the clicking is to unhook actuator and jerk the cable. It has vacumn to the actuator any ideas?

[BlazerLT]

don't replace the regulator, you replace the whole injector.

Also, your encoder motor for your transfer case is shot probably or you have a vacuum leak in the line going to the actuator.

[1994chevyblazer]

Originally Posted by 95Blazed

My blazer sometimes won't start after running for awhile and sitting parked. It started doing the not starting thing first, now it will run but cuts out between 2 to 3000rpm and will suddenly just croak will driving and won't start back up. I have fuel (replaced filter) got spark (pulled wire and got the snap in the arm to prove it)! I replaced the ignition coil, and even tried a little injector cleaner (why not). It will start up again after sitting for a couple hours but just croaks after it warms up good, HELP! Its gotta be an ignition problem, I would think? I'm new here, so let me know if I am too awfully confusing!

i had a problem like that a few months back mine was the egr

[95Blazed]

Replaced the CPI, same problem. Am ready to take it out behind the barn and shoot it!!! lol Any ideas?

[BlazerLT]

You replaced the whole injector?

[95Blazed]

Yes, went ahead and replaced the whole cpi and nut kit. Also changed the egr, still have the same problem. Do you think maybe it is the sending unit?