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No injector pulse

Does start sometimes

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Stuart Kirby

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Computer pulses the injectors. could be a bad computer but more likely low fuel volume or pressure

Posted on Jun 22, 2015

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1 Answer

02 grand prix 3.1l cranks and will not start. no injector pulse. no security light during cranking, replaced cam and crank sensor 24x, new fuel pump, good fuel pressure.
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Do you have spark at the plugs? Have you checked actual fuel pressure KOEO? Have you used a noid light to check for injector pulse?

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05 chevy aveo no injector pulse
At only 30,000? This is not good advertising for Aveo! At those no-pulse times, have you checked for power at an injector connector with key on? With a new ecm, I would not expect the injector ground circuit to be the problem, so maybe you could trace the injector drive circuit back from a wiring diagram. The injectors get power to them when the key is on. They only pulse when the ecm grounds them. good luck, ken.

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No injector pulse
what vehicle? injector pulse controlled by computer. the computer recieves a pulse from crank angle sensor, or distributor pick up, etc.
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Jun 29, 2012 | 1991 Chevrolet Cavalier

1 Answer

Cranks, but will not start. We have spark, timing belts okay, and fuel pressure.
Do you have a tach on the dash? If so crank it over and see if rpm climb, if not you may have a crank sensor out, if you have a test light you can check for injector pulse, sometimes a crank sensor will let you have spark but no injector pulse, there is also a fuse for injectors, you have 2 wires to the injector, connect the test light to the wires and turn it over and see if it blinks.

Oct 23, 2010 | 2001 Mitsubishi Eclipse Spyder

1 Answer

I have no spark or injector pulse sometimes it
You got a crank sensor at back,on top of bellhousing.
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May 16, 2010 | 1991 Dodge Ram 150

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.

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1 Answer

Have 99 sierra has spark and fuel to intake but wont start sometimes sputters but no go please help
You need to find out if you have enough fuel pressure, and if you have injector pulse. A noid light is a simple kind of test light that you can get at a parts house to test injector pulse. Unplug an injector and plug the noid light into the harness. Have someone crank the engine, if it flashes then your injectors are firing. Check all the fuses under the hood. You should have 55 to 60 psi fuel pressure.

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