Question about 1995 Chevrolet K1500

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Truck engine rotates when starting, but does not fire. I listened for fuel pump and heard it running. Do I need to pull n check sparkplugs?

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  • Chevrolet Master
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Hi.

Pull the spark plugs cables one at the time and put the connector near to the engine block while cranking, you will see if there is spark or not.

If there is spark on all the cylinders, then after ,many attempts to start the engine you have probably flooded the cylinders.

Wait thirty minutes, and try cranking again, this time put the key in position one and wait about 20 seconds before cranking.
Also take off the gas tank cap before cranking.

If it still does not work, a complete set of tests must be done.Common cause for cold start problems are air intake and air intake sensors (MAF AIT), no fuel pressure (tested with hand gauge), vacuum problems, IAC valve, EGR valve and more. The first step in troubleshooting is often pulling error codes from car computer using an OBDII scanner.

Posted on Aug 27, 2010

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could be a number of possible faults.1/crank sensor not working when hot,trace this and pour cold water on it(dont do this if it is not by crank pulley as water isnt good for modules etc) and retry.2/sparkplugs worn,but usually they would fault more on cold start.3/fuel pump cuts out when run,try wacking tank from underneath and retry.though I would concentrate on nil spark caused by a faulty ignition module or crank sensor.
Next time it fails to start.pull off a sparkplug lead,make a quick test plug with an old(but working)sparkplug.pull the side wire away from the center electrode 5mm and insert into plug lead.earth ground the plug on its thread against metal on the engine.crank and check for spark visually,don't be tempted to hold the plug while cranking.if nil spark we will have to test further which is faulty sensor.if it sparks ok we will need to test for fuel.
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when it fails,unclip air filter housing,while engine is being cranked,spray an aerosol based carburettor cleaner into air duct to engine,it should start and run while spraying and stop when you stop spraying if fuel delivery is the fault.fuel pump will then need testing/replacing.
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