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Missing injector pulses - How to narrow down the problem? 700 1990

posted by 740_dan on Thu Jun 12 12:29 CST 2014
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last visit: Thu Aug 28 13:10 CST 2014

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I've never tracked down this kind of problem, but I have read the ignition part of the green book. Do you have that one? It explains the theory behind the EZK and all the sensors (maybe that's what you and lucid are referring to).

I've got the greenbooks for 740s on DVD (adequate but wish I had paper version).
Anyway, there is a page showing what circuits are activated when the key is position I, II, and III, its one of the general wiring books. This could be useful to see what circuits are hot during ignition.

If my memory is good, the Injector circuit is out of ECU, So maybe track backwards:
All the injectors fire at once but there could be a problem with that circuit going from injectors to ECU. Then check circuits from ECU to ICU that control injectors.

In the back of my mind, I wonder if it could be an ignition problem, not an injector problem, because I think the computer calculates ignition before fuel. Fuel is just constant pressure and on-off signals to injectors, about as simple as it gets.

--
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Missing injector pulses - How to narrow down the problem? [700][1990]
posted by Will740turbo subscriber on Wed Jun 11 21:13 CST 2014 >

Missing injector pulses - How to narrow down the problem? [700][1990]
posted by Chris Mullet subscriber on Thu Jun 12 06:57 CST 2014 > V
- Missing injector pulses - How to narrow down the problem? [700][1990]
  posted by Will740turbo subscriber on Thu Jun 12 18:28 CST 2014 > V

Smoking Reply to Burning Questions [700][1990]
posted by lucid subscriber on Thu Jun 12 07:25 CST 2014 > V
- Smoking Reply to Burning Questions [700][1990]
  posted by Will740turbo subscriber on Thu Jun 12 18:31 CST 2014 > V
- Smoking Reply to Burning Questions [700][1990]
  posted by Will740turbo subscriber on Fri Jun 13 01:38 CST 2014 > V

Missing injector pulses - How to narrow down the problem? [700][1990]
posted by 740_dan on Thu Jun 12 12:29 CST 2014 > V
- Missing injector pulses - How to narrow down the problem? [700][1990]
  posted by Will740turbo subscriber on Thu Jun 12 18:33 CST 2014 > V
  - Missing injector pulses - How to narrow down the problem? [700][1990]
    posted by aleekat on Fri Jun 13 19:38 CST 2014 > V
    - Missing injector pulses - How to narrow down the problem? [700][1990]
      posted by Will740turbo subscriber on Fri Jun 13 22:57 CST 2014 > V
      - Missing injector pulses - How to narrow down the problem? [700][1990]
        posted by Amarin on Sat Jun 14 00:09 CST 2014 > V
        
        Missing injector pulses - How to narrow down the problem? [700][1990]
        posted by 740_dan on Sat Jun 14 09:18 CST 2014 > V
      - Missing injector pulses - How to narrow down the problem? [700][1990]
        posted by Art Benstein subscriber on Sat Jun 14 11:40 CST 2014 > V
        
        Missing injector pulses - How to narrow down the problem? [700][1990]
        posted by Will740turbo subscriber on Sat Jun 14 14:16 CST 2014 > V

Missing injector pulses - How to narrow down the problem? [700][1990]
posted by jerryc on Sat Jun 14 13:26 CST 2014 > V
- Missing injector pulses - How to narrow down the problem? [700][1990]
  posted by Will740turbo subscriber on Sat Jun 14 14:01 CST 2014 > V
  - Missing injector pulses - How to narrow down the problem? [700][1990]
    posted by Amarin on Sat Jun 14 20:36 CST 2014 > V
    - Missing injector pulses - How to narrow down the problem? [700][1990]
      posted by Will740turbo subscriber on Sun Jun 15 04:28 CST 2014 > V
  - Missing injector pulses - How to narrow down the problem? [700][1990]
    posted by jerryc on Sat Jun 14 22:42 CST 2014 > V
    - Missing injector pulses - How to narrow down the problem? [700][1990]
      posted by Will740turbo subscriber on Sun Jun 15 04:26 CST 2014 > V
      - Missing injector pulses - How to narrow down the problem? [700][1990]
        posted by pageda on Sun Jun 15 04:49 CST 2014 > V

Missing injector pulses - How to narrow down the problem? [700][1990]
posted by Amarin on Sat Jun 14 13:31 CST 2014 > V

Missing injector pulses - How to narrow down the problem? [700][1990]
posted by Will740turbo subscriber on Mon Jun 16 19:01 CST 2014 > V

Missing injector pulses - How to narrow down the problem? [700][1990]
posted by Will740turbo subscriber on Sat Oct 18 18:44 CST 2014 > V

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Missing injector pulses - How to narrow down the problem? 700 1990