Question about Chevrolet G10

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1996 chevy g10 van with 5.7. when cold seems to start right up but after warmed up very hard starting and when it does start it idles real low and rough than starts ilding high and smooth but has black gas smelling fumes come out tailpipe till it cleans itself out than runs fine. fuel pump sounds fine, any advice before i start putting money in replacing sensors. thanks

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  • jmcbride2009 Apr 28, 2010

    thanks chromapr i checked for codes with nothing coming up the only code if for the converter bad but they have been elimated for about 4 years now with no problems. this condition just started in the last week or so, when it does start its acting like its flooded, im thinking possibly egr,crank sensor or something like that but not sure i wish i could get a check engine light but nothing. any more advice would be appreciated thanks.

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Any check engine light? When you start out cold the computer plugs in numbers for the sensors until the engine warms up then it relys on the sensors which sound like are going bad. I would suspect an oxygen sensor first since this will cause the lean then rich situation you describe. auto parts stores have scanners they will hook up free and this would show if the voltages coming from the 02 sensor are off. Also the scanner will show cross counts which is the voltage moving up and down in response to rich and lean air mixture detected in the exhaust. If this is helpful please reply and good luck

Posted on Apr 27, 2010

  • Joseph Gargani
    Joseph Gargani Apr 29, 2010

    thanks for the reply jmcbride-the egr and crank sensor should set a code also. Did you get a chance to see any numbers for the 02 sensor? give me a vin # so i can try it in my scanner to see what the computer gives in catagories. Maybe that will lead to a clue.

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