95 blazer stalling

[etanger]

i have a 95 chevy blazer 4x4 with the 4.3..i replaced the plugs cap and roter, wires,egr valve and the fuel pump is at 50-55psi when in idle, its running rich and when i put the truck in drive or reverse and put the peddle to the floor it spudders and dies out, and you have to put the pedal to the floor when your restarting it or it wont start, so im stumped! any help please!

[b1lk1]

Try cleaning the mass airflow sensor.

[etanger]

i cleaned it and no difference,do you know what its supposed to read on a olm meter?

[blazee]

1995 doesn't have a mass air flow sensor.

Based on the symptoms, I would check for a leaking fuel pressure regulator and/or nut kit (internal fuel lines). This can sometimes be noticed by a fuel pressure test. Fuel pressure should be tested with the key on, engine off. After the initial prime, look for an immediate leak down.

You can also do a visual inspection by removing the Vortec cover and IMTV from the top of the plenum, and looking inside for washing or puddles of fuel. The entire thing should be black, if you see any shiny spots, that is a sign of fuel leakage. Shiny golden spots on the driver's side indicate an internal fuel line (AKA Nut Kit) leak. Shiny golden spots on the passenger side indicate an FPR leak.

[etanger]

i did a fuel pressure test , key on engine of, held at 60psi and no leakdown, any other suggestions?

[old_master]

Originally Posted by blazee

1995 doesn't have a mass air flow sensor.

Correct me if I'm wrong Blazee: Early 95's had the CMFI system and does not have a MAF sensor, but the later 95's had CSFI which does use a MAF sensor. I'm thinkin' if he cleaned it, he must have the CSFI system, if not, no tellin' what was cleaned.

[blazee]

Originally Posted by old_master

Correct me if I'm wrong Blazee: Early 95's had the CMFI system and does not have a MAF sensor, but the later 95's had CSFI which does use a MAF sensor. I'm thinkin' if he cleaned it, he must have the CSFI system, if not, no tellin' what was cleaned.

I think that you may be thinking of the ignition system. The ignition systems changed mid year, easily identified by either vertical or hortizontal connections. It was the transition year for a lot of things. There were also 3 different computer setups. Unique transmission electronics. It was also the only second generation Blazer with a CPI, but that was the only injection system that it came with. The sequential firing injector units didn't come out until 1996. As far as what he cleaned... maybe the MAP?

[old_master]

I'm aware of all of the changeover stuff, 95 was a pot luck year. Some came with OBDI, some with OBDI.5 and I could have sworn I read somewhere that the last of the 95's produced at the Linden, NJ assembly plant had OBDII with CSFI.

[etanger]

my friend scanned it with his snapon scanner, it threw no codes but it showed that the coolant temp sensor was showing it was 5 degrees f out, which could be why its running rich

[etanger]

and you are right,my 95 blazer doesnt have a map sensor, i cleaned the little sensor in the rubber boot by the intake, the iap sensor

[etanger]

fixed it , it was the coolant temp sensor,thanks