Question about GMC C1500

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Why does my 1988 gmc truck turns off when driving

My truck turns off then i put it in neutral and start it agan and it starts again

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  • GMC Master
  • 450 Answers

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

6 Suggested Answers

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  • 2 Answers

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Posted on Jan 02, 2017

  • 291 Answers

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

  • 37 Answers

SOURCE: 2002 F250 gearshift won't shift out of park

on fords theres a switch behind the brake pedal which allows you to shift from park simple to replace.

Posted on Sep 25, 2008

  • 1 Answer

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

  • 21 Answers

SOURCE: turns over too long before starting

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

  • 255 Answers

SOURCE: 1988 GMC truck won't start. No spark in coil. What

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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2 Answers

How do I check a ground connection ? My 1988 GMC Jimmy has a new starter and again it seems to free wheel and not start.Seems to help if I put it in neutral.


You could possibly have a bad park neutral safety switch , power ( voltage ) from ignition goes thru the park neutral safety switch to the S terminal on the starter solenoid . Does your vehicle have automatic or manual transmission ? And you should have voltage drop testing on the starter circuit done . Starter Voltage Drop You could have a bad battery cable .

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May 27, 2009 | 1988 GMC C1500

1 Answer

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.

Oct 21, 2008 | 1997 GMC Savana

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