1995 Blazer 4.3

[laffer98]

My stepson owns a 1995 Chevy Blazer that has developed a random missfire and the locale chevrolet mechanic say's the car is running rich. He suggest replacing multiport fuel injector and/or fuel line from same. The car has recently had new plugs and wires installed and a new IAC valve. Does anyone have any other ideas?

[jaygaz]

i also have a 95 blazer w/ similar problems. A local mechanic said between the yr 95-98 chevy blazer,gmc jimmy's have a faulty central fuel injection sensor which allows the gas to flow around the cylinders. in my case it goes right though the exhaust system which has totally ruined my exhaust. it gives of white smoke and reakes like gas until it warms up. the only problem i dont have like $600 to fix it

[GMMerlin]

The 4.3 VIN # W engines prior to 96 did have a problem with the CPI unit or the lines feeding it leaking inside the intake causing had start,SES lights ,rough idle and black smoke complaints

[jaygaz]

Originally Posted by GMMerlin

The 4.3 VIN # W engines prior to 96 did have a problem with the CPI unit or the lines feeding it leaking inside the intake causing had start,SES lights ,rough idle and black smoke complaints

This is different this is a white gas smelling smoke i have to get it on a computer i guess. thanks though

[cobra1]

all this makes me glad my 95 S-10 w/CPI has made to to 176,000 so far on the original CPI unit.

to you other guys, ive seen where there is a fuel pressure reg. kit out now for about 50-60 bucks..... it is the reg that fails anyway, that or the feed/return lines. this substantially decreases the cost of this fix.

[Ray Douglas]

My 95 blazer is doing the same thing,white smoke
not always stronge gas smell seams more so with
full tank. I'm loseing cooling fliuid not alot,air seams
to be getting into system? I did flush system maybe
have trapped air. can hear in cabin heater core. pressure tested cooling system for headgasket leak
seams ok. cad. converter radels maybe block outlet
condentsates their my smoke fog for 2 blockes help me please its driving me crazy!

[engco463]

Had the same problem..

simple test to determine if faulty fuel pressure regulator. connect a fuel pressure guage up to the test port while watching the gauge turn the key on, listen to the pump engage and watch the pressure when the pump turns off, if the pressure bleeds off then the regulator is bad..

bad thing is when chevy had the regulator on the external part of the engine it was about 15 dollars. but the 95 models placed it internally..
to a tune of $400

if you can afford the new one get it , but I found a salvage yard and had them crack open a shelved engine and paid 200 for the part.. it takes about 45 min to install.

another bad things was that most of the mechanics and dealers didn't have a clue.. said egr, o2 sensors everything but. good luck

[sparky672]

Originally Posted by engco463

simple test to determine if faulty fuel pressure regulator. connect a fuel pressure guage up to the test port while watching the gauge turn the key on, listen to the pump engage and watch the pressure when the pump turns off, if the pressure bleeds off then the regulator is bad..

Good test but only narrows it down to two items. If the fuel pulsator located in the tank is bad, you will ALSO see a pressure drop when the engine is shut off.

While fuel pump is running, crimp off rubber fuel line under car near driver's seat which isolates the tank/pump/pulsator. If pressure holds, then it's a bad pulsator/pump. If pressure still drops, then for sure it's the regulator/CPI.