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No start no fuel in cylinder

Tiny
TUTTER2367
  • MEMBER
  • 1997 CHEVROLET LUMINA
  • 220,000 MILES
New fuel pump and filter good pressure on test port injectors not pulsing no blown fuses crank sensor tested 900 ohms and.5 volts ac when cranking cam sensor signal 10 volts I guess that leaves pcm driver is there any way to test this for sure

oh and I am getting good spark on cylinders 2, 4, 6 I assume 1, 3, 5 good did not ck because seems to be fuel issue wouldn't this illiminate ignition module
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Thursday, September 22nd, 2011 AT 4:52 PM

6 Replies

Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
What is the fuel pressure spec, engine cranking? It is possible what your seeing is the initial prime? After the initial prime, if no rpm signal, no fuel pressure or injector pulse. Use a noid lite on injectors, is there an injector pulse, engine cranking? Voltage to the injectors goes hot with the key on. Controled on the ground side.
What is litre size of engine? My info shows two crank sensors. Any applicable trouble codes? To check for codes, yourself, at the least, you need an obd2 code reader.
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Thursday, September 22nd, 2011 AT 5:43 PM
Tiny
TUTTER2367
  • MEMBER
  • 9 POSTS
3.1 liter I thought only one crank sensor responsible for start 3x I used a scanner no codes but prior to scanning I pulled fuses to ck them including pcm an pcm batt so that might of cleared any On fuel yes all I get is intitial prime I can build up pressure by cycling on pump. No injector pulse. I read some where pcm not involved in start until 400 rpm or something like that but then also that pcm controls ground for injector so I am kinda confused when I had scanner hooked up and tryed to start someone said that the scanner should show rpms it did not
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Thursday, September 22nd, 2011 AT 6:09 PM
Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
With bypass ignition system, the ignition module controls spark during cranking, only. Without rpm signal, no injector pulse, cranking or otherwise. I think there is a crank sensor issue, but, I can't rule out the ignition module, at the moment.
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Thursday, September 22nd, 2011 AT 8:11 PM
Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
It's the 24X crank sensor, I'd have to look at. If the 3x signal is lost, the pcm should use the 24x signal for fuel and ignition.
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Thursday, September 22nd, 2011 AT 8:19 PM
Tiny
TUTTER2367
  • MEMBER
  • 9 POSTS
That is where I looked for testing my results points toward ignition module if they are correct my biggest concern is putting more money into it and then finding out it is a bad pcm driver that would end up costing more than what car is worth
IS THERE ANYWAY TO BE SURE IT IS NOT PCM? If I am reading that right I got 12 v going into ignition module good ground and my 3x testing at.5-6 volts ac then ignition module is bad called Autozone this type of ignition module they can not test. But again biggest concern is pcm witch would involve an expensive towjob to nearest dealer for programming
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Friday, September 23rd, 2011 AT 2:03 AM
Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
With some GM with dis ignition, the purple wire with white tracer at the ignition module, is for the rpm signal. Use a noid lite at injector plug. Take connector loose for purple wire. Turn key just till dash lites come on, no further. Use an led testlight connected to battery voltage, tickle the purple wire with white tracer terminal on wiring harness, see if noid lite will flash? If it does, I don't think anything is wrong with your computer. I don't know if this will work on your system, have seen it work on other systems?
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Friday, September 23rd, 2011 AT 4:53 PM

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