Question about GMC C1500
My truck turns off then i put it in neutral and start it agan and it starts again
Fuel pump, or fuel punp relay mounted on fire wall, check the fuse in relay, also check the ground wire from fuel pump (in tank) to the inlet pipe , under the truck, where you put gas in, fuel pump needs a good ground period. fuel pump could be on its last leg ! reason why I know this is cause I have a 1988 gmc 3/4 ton. to access fuel pump, I cut an access opening in truck bed, 12" square above tank at location of pump. better than dropping tank, besides the truck is how old ? makes a hard job easy. change your fuel filter also. good luck, ken
Posted on Jan 12, 2013
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Posted on Jan 02, 2017
SOURCE: neutral safety switch
most gm nuet safety is yellow and purple .....out of ignition switch is a big yellow wire that is crank out and input to nuet saf switch......out of nuet switch is color purple that goes strieght to start selenoid.....purple wire also goes to the crank fuse 5amp.. in the fuse box under dash... this fuse goes to the pcm main computer.. same for auto and clutch
Posted on Sep 04, 2009
SOURCE: van turns of suddently
you might have a problem with the iac valve (intake air control) it could have debris need to remove and vary carefully claen it with brake and parts cleaner but before you do this there is a simple way of checking it.wiht your car turned on have somebody step on the brake wile you bang on the iac valve with a wrench or screwdriver,if you notice a change in the engine most likly it is the iac valve.
Posted on Oct 21, 2008
An engine temperature sensor that halfway works could be telling the ECM that the engine is already warm but the problem is more likely to be a fuel pressure problem or both. A fuel pressure leak-back within the system or lack of initial prime cycle ( the prime cycle is activated for about 3-5 seconds when the key is turned to the on position regardless of whether you start the engine or not.) To check this; have someone listen at the fuel tank (unless your pump is noisy, and most of them are) and when you cycle the ignition all the way off for about 5 seconds and then to the on position ---WITHOUT TRYING TO START IT-- you will hear the pump make a buzzing sound for 3 to 5 seconds each time you cycle the key off for about 5 sec and on for 5 seconds. If you can hear the pump cycle while doing this test then try cycling 2 times before starting and if it starts immediately each time then you will probably need to replace the pump or regulator depending on a couple other tests to find out which one. If you have very high mileage and cylinder wear then it may also take a little longer to start. it should never take more than about 4 seconds to start and 2 to 3 is even better. look into those couple things and any questions or additional information --just ask
Posted on Apr 27, 2009
check fuses and make sure you have voltage at coil if voltage is presant than suspect picup coil or ignition control module
Posted on Aug 14, 2009
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