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1997 chevy k1500 5.7l.while driving the engine just shut off, tries to start,but the engine shutters real hard, it has new cap and rotor, plugs and wires the only code i get is my upstream o2 sensor

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O2 sensor don't kill the engine. Lower gas mileage, yes. You don't enough info, like how long it takes or how far and how fast. I would be looking at the fuel side. Replace the fuel filter first. Cheap fix. Just a note. Clogged fuel filters usually take out the fuel pump also.

Posted on Dec 04, 2016

Testimonial: "The truck does not start at all it tries, then it shutters and nothing, sort of dieseling."

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  • Randy Ohler Dec 04, 2016

    Check how hot it is getting. Dieseling on gas engines is from overheating.

  • Tim Schneider
    Tim Schneider Dec 05, 2016

    it not hot at all, it will not start.

  • Randy Ohler Dec 06, 2016

    Lots of black smoke out the exhaust? Replace the engine coolant temperature(ECT) sensor. Older GM's like in the 90's were real susceptible to ECM dumping fuel for bad ECT sensors. The ECM would read the ECT at -40 degrees. And dump lots of fuel in. A scanner will tell you right off. If this is the problem, replace the ECT and you should change the spark plugs also, they are gas fouled out. A cold start and dieseling does happen unless there is way to much fuel. It will have the black smoke or a real strong smell of fuel at the tail pipe.

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Sometimes o2 sensors can block the engine. It may have triggered the fuel cutoff. Check your manual for location of the cutoff switch and try to reset it. It may keep it going long enough to get sensor replaced or at least checked out.

Posted on Dec 04, 2016

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