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1995 GMC Topkick starts and dies immediatly. Fuel injectors quit getting a pulse.What is the problem?

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Mass air flow sensor.

Posted on Oct 06, 2009

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Posted on Jan 02, 2017

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My '91 GMC Jimmy suddenly died like it was out of gas. It restarts, but idles rough, sputters and pulses. Plenty of fuel comes out of the injectors, but it wants to stall and die.


start at the beginning fuel pump pressure at the pressure regulator then look for ignition problems , check mass air flow sensor if equiped

May 06, 2015 | GMC Jimmy Cars & Trucks

2 Answers

My 1995 subaru will not start.  i have tried spraying starting fluid in the injectors the car ran for 2 seconds and died.


If the engine fired on ether it means that you have a fuel supply problem, check the fuel pump.

Jan 16, 2010 | 1995 Subaru Legacy

1 Answer

1990 gmc 6500 topkick with no spark or injector pulse. all 4 wires on the ignition coil have battery voltage with key on. is coil shorted or is the ignition module bad?


You are jumping to conclusions. Slow down.
No spark AND no injector pulse indicates none of the desired outputs were triggered. The ignition module makes spark when it receives a crankshaft position sensor signal, and then transfers control of that spark to the computer after it starts. The module takes its crank sensor signal and generates an RPM count that it forwards to the PCM(main computer) which is used for triggering the injectors and controlling timing. SO, if you had a bad crank sensor OR a bad ignition module, you could lose both spark AND fuel. a coil would not disable injector pulse. modules RARELY fail in a manner that disables RPM reference to the computer causing it to not fire the injectors...At this point, I would TEST the crank sensor as the next step. If its easier, 1 of the wires on the module goes directly there so you can test the crank sensor at the module.

Sep 18, 2009 | 1990 GMC K3500

2 Answers

I have a 1995 gmc jimmy 4x4 i check fuel pressure an the voltage


a simple 12vdc will not due, it needs a pulse signal from the computer. a full 12vdc could fry the injectors, but the spider assemblys in them v6's are always a @$!$@ up design. i have encountered alot of them with bad pcm, or the spider.

Sep 15, 2009 | 1995 GMC Jimmy

1 Answer

1995 buick lesabre custom. has a new fuel


even if you have preasure in the line that does not mean you have fuel going into the engine. you should check the injectors to see if they are spraying and if not you need to check the injector pulse to find out if the PCM is sending the signal to them to spray. to check injector pulse you will need a noide light to test the pulse it the light lights up you have pulse, but easy way to check is pull an injector and turn the engine over see if it sprays.

Aug 24, 2009 | 1995 Buick LeSabre

1 Answer

Injector pulse


I am guessing this has the 4.3 vortec and if so the problem likely is in the spider assembly in the intake. They are quite expensive, around 300-350. I have seen them on Ebay for under $100. These are common to go bad. Here is a link to the Ebay searches. http://motors.shop.ebay.com/Parts-Accessories_?_nkw=4.3+spider&_catref=1&_dmpt=Motors_Car_Truck_Parts_Accessories&_ipg=&_sacat=6028&_trksid=p3286.c0.m282&_rdc=1

Jul 24, 2009 | 1995 GMC Jimmy

1 Answer

Injector pulse


these cars are bad about crank position sensors they send a signal to the computer to pulse the injectors

Nov 28, 2008 | 1995 Buick Park Avenue

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