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Driving Me Nuts Help

96chevy7.4L

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96chevy7.4L Enthusiast

96chevy7.4L

Posted
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Hi guys my truck is driving me nuts help. It sputters and misses and just runs like crap when stopping at a stop sign or red light. You can open the driver door and smell it running real rich. No check engine light. Cleaned the mass air sensor, cleaned the throttle body. Checked the fuel pressure at the service port I have 55psi. Put in a can of sea foam to rule out bad gas. Its been doing this for a few days now. Went on a fairly long trip and burned out that tank of gas when it started. It now has shell 93 in it. Yet yesterday it cleared up and now this morning its back to its bad behavior. The TPS is new and so is the MAP sensor. Any ideas before I burn it.

Stevens03 Senior Enthusiast

Stevens03

Posted
Posted

When was the last time you changed the fuel filter? If thats out, then I'm with the others,... possible vacuum leak. :sigh:

dlewis1111 Senior Enthusiast

dlewis1111

Posted
Posted
Hi guys my truck is driving me nuts help. It sputters and misses and just runs like crap when stopping at a stop sign or red light. You can open the driver door and smell it running real rich. No check engine light. Cleaned the mass air sensor, cleaned the throttle body. Checked the fuel pressure at the service port I have 55psi. Put in a can of sea foam to rule out bad gas. Its been doing this for a few days now. Went on a fairly long trip and burned out that tank of gas when it started. It now has shell 93 in it. Yet yesterday it cleared up and now this morning its back to its bad behavior. The TPS is new and so is the MAP sensor. Any ideas before I burn it.

 

pcv valve

pcv valve

pcv valve

 

had one do the exact same thing did i say it was the pcv valve?

96chevy7.4L Enthusiast

96chevy7.4L

Posted
  • Author
Posted

The fuel filter was changed about 5,000 miles ago. I will definitely look at the PCV valve as I haven't changed it in quite a while. A vacumn leak is another great idea. Thanks for the help I will keep you posted.

pm26 Senior Enthusiast

pm26

Posted
Posted

Make sure that your EGR valve is not stuck open due to carbon buildup. That will cause serious running problems.

96chevy7.4L Enthusiast

96chevy7.4L

Posted
  • Author
Posted

How do I check the EGR? I know where it is and its never blinked a code. Does it need to be checked with the engine cold? If so it should be in what position? Is there a way to clean it?

  • 1 month later...
96chevy7.4L Enthusiast

96chevy7.4L

Posted
  • Author
Posted

hi guys just an update. Its not as bad as it was but it still real aggrivating. Where is the fuel pressure regulator on a 99 7.4L engine? Does the upper intake have to come off to change it? Going to pick up a fuel filter today and see if that helps! I will try another PCV valve also. I bought it and its really small. I had the intake off my 96 that I had to put in bigger injectors but didn't see the pressure regulator anywhere. If it was the fuel pressure regulator would it still maintain proper fuel pressure at the service port? Are O2 sensors next as there are 4 and there not cheap. HELP!

  • 2 weeks later...
96chevy7.4L Enthusiast

96chevy7.4L

Posted
  • Author
Posted

Turns out the fuel filter didn't work. Didn't improve at all. The EGR wasn't malfunctioning. Fuel pressure in spec. Plugs are clean not real rich or black.n So I went back to basics and come to find out it very well may be a fuel pump relay acting up. I replaced it today and the truck is 100% better. Got rid of that cheap relay that I got at one of the auto parts places and got an AC-Delco. Never even heard of a relay causing these kinds of issues. You would think a relay would either work or it wouldn't. Anyone ever have this problem. Curious to know.

C. Charles Hahn Senior Enthusiast

C. Charles Hahn

Posted
Posted

We had a similar issue to this with a buddy's Vortec 350.... ended up replacing the ignition coil and that solved the problem.

 

Interesting that a relay would cause that.... I'll have to keep it in mind in case it ever comes up again.

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