Question about 1995 GMC Jimmy

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Injector pulse Has fuel pressure, changed the fuel pump and the computer. Still will not start. How does it get injector pulse?

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  • Anonymous Mar 29, 2014

    replace fuel injectors

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  • 54 Answers

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

Posted on Jul 24, 2009

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1 Answer

What causes o low injector pulse


Is that static pressure with key on, engine off? Or engine running pressure? Both should be near 60, usually key on, engine off pressure will be about 3 or 4 psi higher.
If it runs good after starting, the injector pulse must be good. No reason why starting and running pulse should be different. Only difference is when running, fuel pump power is kept on by the oil pressure switch, whereas in starting, the fuel pump relay keeps the pump on. Very unusual, let us know. Measure voltage at one of the injector's power wire with key on. It should be battery voltage or very close.

Aug 22, 2015 | Cars & Trucks

1 Answer

Won't start add starter fluid it turns on n runs good what's the problem n what controls the injector pulse


Injector pulse is controlled on the ground side by the computer. The power side is supplied through a fuse. IS the fuel pump working? How about a restricted fuel filter? You need to determine if there is any fuel pressure before attempting to diagnose an injector issue

Aug 22, 2015 | Cars & Trucks

1 Answer

Car wont start


Try a little starting fluid in the intake and see if it runs a few seconds. If it does, it could be low fuel pressure or an injector problem. Maybe they aren't pulsing.
You have voltage to the injectors; now check the ground circuit: Use a test light and clip the lead to the POSITIVE post of battery. Put the probe into the ground terminal on an injector connector, and have someone crank the car over. If the test light is blinking, the ground circuit is good. When it blinks, that is when the computer is grounding the circuit for injector pulse to occur.

Apr 20, 2014 | 1993 Chevrolet Cavalier

3 Answers

My 1989 camaro runs when I pour gas in the throttlebody but then dies when the gas runs out


I guess my first question is how do you know the injector has fuel ?
You would need to know if the injector is getting voltage and pulse from the computer, and if the fuel pressure is enough to allow the injector to spray.

Dec 13, 2012 | 1989 Chevrolet Camaro

1 Answer

No injector pulse


what vehicle? injector pulse controlled by computer. the computer recieves a pulse from crank angle sensor, or distributor pick up, etc.
then controls injector pulse. Mass air flow on some vehicles determines spray pattern

Jun 29, 2012 | 1991 Chevrolet Cavalier

3 Answers

1989 Ford Ranger 2.3l. Won't start. Does not have injector pulse. Has spark on all 4 passenger side wires. Has at least some fuel pressure. Timing and belt good. This was a progressive problem in that...


The fuel pressure has to to 35 to 45 psi. And no low fuel pressure will not cause no injector pulse.The veicle sounds more like a idle air control problem why? because as you stated it runs rough when it does start.Get it to start sysle the key you will hear the fuel pump go on cycle it three times then start it up. when the vehicle warms up take the idle air valve out and clean it with carburator cleaner or even brake cleaner you may even want to do the throttle body itself this should help with the hard start up and rough running

Aug 15, 2011 | Ford Ranger Cars & Trucks

1 Answer

No gas coming out the injector and there is gas pressure to the injector?


Is there an injector pulse going to the injector?(an electrical pulse to fire the injector).
Is there spark at the plugs?
If the pickup in the dist is faulty you won't have either one.
If your vehicle uses a crank pickup with or instead of dist pick up....if it is defective ....no pulse.
The above is 90% cause of no pulse....other is computer problem 10%.
If you do have a injector pulse and no spray.....and have fuel pressure....change the injector.
A quick check for spark is spray a little starting fluid in it.....if it starts on the fluid....spark is present.

Nov 03, 2009 | 1997 Chevrolet Blazer

1 Answer

1994 pontiac bonneville fires up but stalls imediatly


WOW a 94 with 46K on it thats rare. Your computer may be bad it sends the pulse to the injector.

Apr 09, 2009 | 1998 Pontiac Bonneville

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