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1999 Dodge Ram 1500 Van. No injector pulse on a NOID Light until you add starting fluid. Then it fires up and injector pulse returns.

New crank, and cam sensors, new PCM.

Posted by Tommie Bell on


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Michael Crain

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If your 1999 Dodge Ram 1500 Van is not producing an injector pulse until you add starting fluid, and then it fires up and the injector pulse returns, there may be a problem with the fuel system. Here are a few steps you can try to troubleshoot the issue:

  1. Check the fuel pressure: A low fuel pressure can prevent the injectors from functioning properly. Use a fuel pressure gauge to check the pressure at the fuel rail, and make sure it is within the specified range for your vehicle. If the fuel pressure is low, there may be a problem with the fuel pump or fuel filter.
  2. Check the fuel injectors: The fuel injectors may be clogged or malfunctioning, preventing them from delivering fuel to the engine. You can try cleaning the injectors, or have them tested at a reputable repair shop to determine if they are the source of the problem.
  3. Check the wiring and connections: Make sure that all of the wiring and connections to the fuel injectors are secure and in good condition. Any damaged or loose wiring can prevent the injectors from functioning properly.
  4. Check the engine control module (ECM): The ECM is responsible for controlling the fuel injectors and other engine functions. If the ECM is faulty, it can cause problems with the fuel system. You can have the ECM tested at a reputable repair shop to determine if it is the source of the problem.
If these steps do not resolve the issue, it is best to have your vehicle diagnosed by a professional mechanic. They will be able to diagnose the problem and recommend the appropriate repairs.

Posted on Dec 10, 2022


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First question is are you getting spark to the plugs ?
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Hi there:
You will have to pinpoint what the engine is missing... spark / fuel / compression

All three of these are tested when the engine is being cranked over. There are two way of checking for fuel. Fuel pressure and fuel trigger. Both are very important and must be present for the engine to start. Fuel pressure is self explanatory. You just hook up the gage and see what the reading is. Fuel trigger is check with a noid light. The injector gets unplugged and the noid light gets plugged in to the injector clip. With the engine cranking over, this light must blink. This is the signal to the injectors from the computer. You can have all the fuel pressure in the world, but it wont matter if the injector is not pulsing gas into the cylinder like it should.

Compression tester, spark tester, fuel pressure gage and noid light are all accessible at your local auto store. All three tests play a very important part in diagnosing a no start condition. Be extremely careful when doing these tests.

Hope this helps; also keep in mind that your feedback is important and I`ll appreciate your time and consideration if you leave some testimonial comment about this answer.

Thank you for using FixYa, have a nice day.

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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.


You need to use a LED type test light for the injectors or a Bosch style Noid light for the injector. To test the cam/crank sensor signal you either need a scanner to read them or a lab scope to show you a signal. The pickup plate in the dist handles the injector timing, the crank sensor provides a RPM signal. They both feed the computer information for ignition timing. Good fuel pressure, injector activity(Noid), and good spark out of the coil. The coil is what I replace the most of.
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