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No injector pulse

Does start sometimes

Posted by Donnie White on


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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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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 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 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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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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