Question about 1991 Chevrolet Cavalier

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No injector pulse on start up runs if i add gas to start then i get the injectors to pulse

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  • roger bakke Jan 19, 2013

    its a camaro not cavalier have 12volts to ground with ignition on should go to 3 volts when crankin but no voltage accross injectors ohmed out injectors theyre goodd

  • roger bakke Jan 19, 2013

    its a tbi system 2 injectors 12 volts to ground have the 3 volts needed when its running dont have the 3 volts to addd gas to start

  • roger bakke Jan 20, 2013

    did a fuel press test its perfect

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  • Chevrolet Master
  • 21,873 Answers

When you unplug all of the injectors, are you saying you have battery voltage on one side but nothing coming from the computer on the ground circuit ? 6 and 8 cyl engines are connected in series, such as odd cylinders are grounded at the same time on some models.

Posted on Jan 19, 2013

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Posted on Jan 02, 2017

Molson02536
  • 3854 Answers

SOURCE: 1993 s10 2.8 tbi the fuel pump fails to pressurize

There needs to be 60 PSI of fuel pressure in the system to have the fuel injectors to work. There is also a fuel pump relay on the fire wall just left to the brake booster, There is two relays there, i just can not remember which relay is which but try switching the relays with one another. Also check the fuses to the fuel pump and ECM, and the fuel pressure from the shredder valve. Good luck and keep me posted, not a bad Idea to also replace the fuel filter, and that is located at the inside frame rail under the drivers side.

Posted on Jun 03, 2009

redbeard00
  • 957 Answers

SOURCE: no power tp the fuel pump, injectors not pulsing, no fuel.

Check out your oil sending unit, fuel pump and relay, check for power (might be a fuse), the ignition control module (which if you remove it, can be tested for free at AUTO-ZONE), any related wiring, pick-up coil (inside the distributor), and possibly the ignition switch. If I can be any more help just as away.

Posted on Jun 06, 2009

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Oct 23, 2015 | Dodge Cars & Trucks

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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

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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

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Fuel injectors not working


Possible ECM not seeing cam or crank signal to fire injectors

Jan 21, 2014 | Ford Ranger Cars & Trucks

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Car is not getting gas to run, it will run if i pour gas into the ail cleaner area, i replaced the fuel pump fuel, fuse, filter, ect, still no luck,i hear the pump turning on for a coulple of seconds so...


Is the theft light flashing?

If it is than the pump will run but the computer will shut down the injectors. The car will run if poor gas in the throttle body as you described.

If the theft light is not on I would check for power to the injectors and injector pulse.

Nov 12, 2010 | 2002 Chevrolet Malibu

2 Answers

Please help


check voltage to them,if there is none,replace the ecm,if there is voltage to them replace the injectors

Jun 13, 2010 | 1993 Jeep Grand Cherokee

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

Ok i had a p0302 and then i changed plug wires coil packs the icm injectors camshaft sensor and now i can a p0301 code.. and when i clear the code it will come back with the same code or else a p0300.. im...


1. Freeze Powertrain Control Module (PCM) and see if the problem can be duplicated.

2. Wiggle tug test wiring for #2 injector.

3. Scope the #2 injector for a glitch when the misfire happens. 1. Test for the Exhaust Gas Recirculation (EGR)/coolant adapter gasket leaking EGR gases past the gasket.

2. Connect a vacuum pump to the MAP sensor, block the vacuum source, reset fuel trims, start the engine and add typical vacuum to the MAP sensor and check operation.

3. Test the spark output with 2 High Energy Ignition (HEI) testers, at 25 KV air gap each, at the spark plug wires to ground at wires 2 and 3, then 1 and 4 at cranking speed and engine running.

4. Test the fuel injector pulse width at the injectors compared to the scanner data.

5. Disconnect the O2 sensor, reset the fuel trims, test the system operation in open loop, test injector pulse width. Compare to the closed loop operation injector pulse width and engine operation.

6. Test the Powertrain Control Module (PCM) powers and grounds during the problem.

Oct 13, 2009 | 1996 Chevrolet Cavalier

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