Question about 1995 Chevrolet Tahoe

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95 Tahoe 5.7 putting too much fuel in the cylinders. Noticed vehicle running extremely rouch. Changed the plugs, distributor cap, rotor button, intake manifold gasket, fuel filter, fuel pump, EGR valve, and several other items. Running rich has caused the catalytic converter to go out too. What could be causing this

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  • Justin Yoder Mar 15, 2012

    Turns out after many more hours of digging into the problem, the diagnosis is burnt valves and/or bad cam. Going to open her up more to see what's going on. Thanks for reviewing my post and trying ot assist.

  • Nick M Dec 04, 2012

    How did you come to that conclusion? I was told that it might be the CAT

  • Nick M Dec 04, 2012

    I have a similar problem. No power at all and very low exaust pressure out of the tailpipe. It's not blowing any smoke at all but it's running ruff around 1100 RMP. It's running super rich and my fuel mileage is bad.

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  • Chevrolet Master
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Pull the vacuum hose off of the fuel pressure regulator and the map sensor and if you see any fuel run out of either of them then replace the regulator.

Posted on Feb 24, 2012

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  • Chevrolet Master
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This engine is throttle body fuel injected. there is no vacuum line to the fuel pressure regulator as it is part of the throttle body.

I would be curious to see what fuel presure is and whether or not it holds fuel pressure. The regualtor can still be leaking but it will not be leakingout of a fitting that a hose attatches to.

Two things I would check

1. with a scan tool I would check to see what the coolant temp sensor is reading.

2. I would try unplugginh the upstream O2 sensors and see if the condition improves. It is possible that there are stuck rich or lean and causing your symptom.

I assume it is running rough at idle as well. You should be able to remove a spark plug wire from one cylinder at a time with the engine running and see if you hear an RPM drop. If one or more cylinders does not drop RPM with the plug wire removed check compression on that or those cylinders. It is possible that you have a dead cylinder which would cause a rough run and cause unburnt fuel to enter the CAT which would also cause it to fail.

If the Cat was plugged it could also cause your symptom.

Posted on Feb 24, 2012

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  • Chevrolet Master
  • 2,431 Answers

Your fuel pressure regulator remove the hose that is attatchede to it gas is entering the vacuum line from fuel pressure regulator

Posted on Feb 24, 2012

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Posted on Jan 02, 2017

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SOURCE: 1976 Chevy Monte Carlo 350cid 4bbl Cal. model.Cars

check for fuel lines laying near heat sources such as on manifold , gas gets hot and can cause vapor lock, also check the automatic choke is it sticking and causing flooding after car warms up?

Posted on Sep 15, 2009

  • 12650 Answers

SOURCE: My 1999 chevy tahoe is leaking antifreeze. I

it could but- check passenger side front where heater core line go into manifold right behind alternator the hose line is connected by a press clip into an alloy fitting this fitting gets eaten away by anti freeze and hose angle pulls back on fitting the part is $18 at dealer and is screwed into manifold use caution if ur r going to replace at very edge of aluminum manifold---and check ur water pump bolts the 2 longer ones should have a lock sealant on them they bolt in thru a water jacket

Posted on Oct 24, 2009

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