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#2#4#6 missfire?

BEASTJEEP95

By BEASTJEEP95
in Ask A GM Technician

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BEASTJEEP95 Enthusiast

BEASTJEEP95

Posted
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:gmc: Hey everyone-

 

Got a strange problem, 95 CPI with no fires on two four and six. Happend sudden when i was heading home. Smackd the gas from a stop sight, made the nornal chirp sound into second, and as soon as it shifted i had hardly any power at all. Have plenty of spark. Headers on right side are cold too touch when i can get it to run, but left side heats right up. I havent taken off the upper plenum but its the next thing i am going to do. Anyone know how this focking spider junk s**t injector banks, there are only two wires to it. Anyone? :cheers:

95Sierra2500 Senior Enthusiast

95Sierra2500

Posted
Posted

Sounds like your poppet nozzles on the passenger side are not opening because they're not being pressurized. Could be a bad injector, regulator, or something along those lines. It's definately fuel related I'd say if you have spark at all cylinders but no ignition.

BEASTJEEP95 Enthusiast

BEASTJEEP95

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I THINK IT IS FUEL ALSO. BUT WHY ALL THREE AT THE SAME TIME? THE ENGINE ALSO SMOKES BAD, IT IS A FUEL SMOKE. FUEL WILL DRIP OUT OF THE EXHAUST PIPE. MABY THE INJECTORS ARE LEAKING. I PULLED THE NOZZLES AND SHOT AIR THROUGH THEM, THEY WERE NOT CLOGGED.

95Sierra2500 Senior Enthusiast

95Sierra2500

Posted
Posted
You may want to check your injector fuses.

 

 

 

 

He's only got 1 injector that has 6 poppet nozzles at the ends of a spider assembly. Really dumb setup, they could have put a fuel rail on it for the effort they took to put the fuel system inside the manifold.

BEASTJEEP95 Enthusiast

BEASTJEEP95

Posted
  • Author
Posted

I THINK IT IS FUEL ALSO. BUT WHY ALL THREE AT THE SAME TIME? THE ENGINE ALSO SMOKES BAD, IT IS A FUEL SMOKE. FUEL WILL DRIP OUT OF THE EXHAUST PIPE. MABY THE INJECTORS ARE LEAKING. I PULLED THE NOZZLES AND SHOT AIR THROUGH THEM, THEY WERE NOT CLOGGED.

95Sierra2500 Senior Enthusiast

95Sierra2500

Posted
Posted

As I said, you have 1 injector. It may be bad, or you may have other issues in regards to fuel. Also, the poppet nozzles will stick open or closed, either one is a possibility. Shooting air through them doesn't necessarily fix the problem.

BEASTJEEP95 Enthusiast

BEASTJEEP95

Posted
  • Author
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Could it be the fuel pressure regulator? I pulled off the plentum and when I had the fuel pump kick on fuel squirted out of a hole on the regulator. I am pretty sure liquid fuel is not supose to be sitting in the bottom of the intake manifold. I also put power to the injector with some spair wire, the injector had fuel pressure behind it but nothing happened it would just click.

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