no spark no injector pulse

[gotboost21]

I have no spark no injector pulse, I have power to both the asd relay and fuel pump relay for 2 seconds when I first turn the key to on, then power disappears. I replace crank and cam sensors and the computer...I dont know where else to go with this. Oh btw... When I first put the new computer in it started I shut it off, came back the next day to try and start it it did and stalled and now it wont restart and I'm back at square 1. Since then I replaced the computer with a warrantied 1 and still no spark or injector pulse...Any suggestions would be great

 

[96TurboGS]

Any CEL’s???...Try putting it on a scanner (being that its new it should work properly ). Does your ecu match the year of your car? Have you checked your engine harness for damage around the EGR tube?

 

[gotboost21]

no damage around egr tube, as far as I kno the ecu is for my year and no cel's already tried using a snap on tool

 

[96TurboGS]

That's not making any sense, if you were able to run the Snap-On tool and were able to connect to the PCM (witch has to be grounded to work at all – basic DC Theory) to find no codes, then there is failure somewhere. It should have at least picked up a DTC pending code. How many times have you tried to get your car to start before you scanned it? How are you going about checking injector pulse and spark? Have you changed a timing belt or messed with the timing before this happened?

 

[gotboost21]

no, I havnt played with the timing or anything like that, and I to check for injector pulse and spark I back probed the connector with a test light in the correct terminals and waited for a flash from the test light which never happened

 

[96TurboGS]

Are you checking it with the key to ON or with the key to Start? Have someone crank the car and probe the grounds on the injectors/coil pack for a pulse. If you have no pulse when cranking (assuming you’re checking it right) stick the ohm meter on the beginning to end of each wire and check for continuity. If that doesn’t work go about checking each sensor for receiving/sending voltages at the crank/cam sensor. Being that you have a new PCM, try cranking it a couple more times and put it back on the scanner. The PCM had to flag a DTC, if not check the PCM/Fuel pump/Fuel pressure/Lose grounds. It is important you don’t skip any of these steps.

 

[Locke]

no, I havnt played with the timing or anything like that, and I to check for injector pulse and spark I back probed the connector with a test light in the correct terminals and waited for a flash from the test light which never happened

To test for injector pulse, you'll want either a noid light, or a meter with a high sample rate. The injector pulse is neither long enough or powerful enough to light most conventional test lights.

Noid lights are very inexpensive.