Question about 1992 Chevrolet S-10 Blazer

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Problem to start engine

I already change all intake air sensors, intake fuel port, distributor, spark plug, and still have problem to star engine. When the motor finally start, the RPM goes up and down.

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  • alfre19do Oct 14, 2008

    Before change of fuel pump, could be possible that problem be with the pression fuel sensor?

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Have you checked that your injector pulse is good on start up and run Have you checked both pcv valve and idle bypass are working correctly.Have you done an engine vacuum leak test

Posted on Oct 14, 2008

  • tony yeatman
    tony yeatman Oct 14, 2008

    Due to age of vehicle injectors may be leaking vacuum through the seals use a can of carby cleaner to show up fault do with engine running if it reacts to the carby cleaner change seals injectors may also benefit from a bottle of injector cleaner .Carb cleaner will show up any engine vacuum leaks MUST use wisely and spareingly as it will damage paint and should not be sprayed on high voltage or exhaust

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This sounds like a week fuel pump and or pressure regulator....... common on the 4.3 litre engines... also check the egr valve for sicking valve due to carbon build up. also the "poppet" valves get stuck on the spider assembly causing a misfire - ruff idle- hard start if ya need any more info let me know

Posted on Oct 14, 2008

  • Jimmy
    Jimmy Oct 14, 2008

    also a bad ground will cause eratic drivabilty problems. check the ground from cowl to frame..........

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Check all of the battery terminals and cables and check the wires on the starter/selonoid, start from the battery and follow the cable out and check all conections , clean and tighten them and if it still does it the starter/selonoid is bad and needs replacement...

thanks

Posted on Oct 14, 2008

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  • ready2helpu Oct 14, 2008

    also check the throttle position sensor and/or the max air flow sensor.

  • ready2helpu Oct 14, 2008

    Depends. You Will Need To Get The Engine On Top Dead Center Or Near, On The Firing Stroke Of Number One Piston. Try This : First Remove Dist. Cap. Find The Rotation Of Distributor. Remove Spark Plug From Numer 1 Cylinder. Get Some Toilet Paper, Roll A Small Amount Into A Plug That You Can Push In The Hole You Removed The Plug From. BE SURE!!!!!!!!!!!!! You Do Not Push Into Engine. You Only Need A Little For Restriction. Have Someone Bump The Engine From Inside With Ignition. Your Plug Will Make A Pop When It Blows From Number 1 Cylinder. At This Time You Will Be Very Near Firing On # 1. Next Look Where The Rotor Button Is Pointing. This Will Be # 1 Or Very Close. You Should Be Able To Work It Out From This.

  • ready2helpu Oct 14, 2008

    replace intake manifold gaskets, if gaskets have been replaced and intake has been clean oil and plugs have been changed then your problem most likely would be the timing.timing the distibutor on a vortex engine sometimes can be tricky.

  • ready2helpu Oct 14, 2008

    yes it could be the problem.you can try.

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Have you run a fuel pressure leak down test overnight? If the electric fuel pump check valve is defective the pump has to fill the filter and lines up when you start the engine because the fuel has drained back to the tank instead of staying in the lines, this causes long starting times and surging idle problems due to air in the lines. Change the fuel pump, it is in the fuel tank, this is a fairly common problem. Ti do the test hook up a fuel pump pressure guage at the test port and start the engine, shut the engine off and leave it overnight, the pressure should not drop more than 5-7 PSI

Posted on Oct 14, 2008

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