Question about 1997 Chevrolet Blazer

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I Just replaced the motor with a used one. Run's great, except at take off from a stop it seem's to miss. Once the RPM comes up it run's great.???????????? The used motor was rebuilt, apperantly with a performance cam. Did a diagnoses check and came up with code P 1345 crank sensor, replaced, did not help. Any idea's??

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  • 39hudson Dec 12, 2009

    No, still the same code. Maybe a bad wire by the sensor?

  • Mark Egan May 11, 2010

    Any new codes since replacing the crank sensor?



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Performance cam will deliver more power.

More power equal more AIR and FUEL.

Can you go back to the same yard to pull the fuel pump,fuel injectors,fuel regulator?


Check for vacuum hose leak.

Check for intake manifold leak.


Back track and check for the cam requirement.

Is it come in a FULL KIT?


Posted on Dec 12, 2009

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Usually when the crank sensor goes out the engine wont run at all cause the computer does not know when to fire the plugs or the injectors. I would find out what size cam is in the engine because the calibration could be wrong in the computer for a large cam. Also it sounds like it is either not enough or too much fuel present during take off.

Posted on Dec 12, 2009


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