Update - Got Spark, Got Fuel Pump, still no start - Saab 900 Bulletin Board

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Update - Got Spark, Got Fuel Pump, still no start Posted by Mr. Science (more from Mr. Science) on Wed, 29 May 2002 21:50:50

In Reply to: Car Won't Start, Mr. Science, Wed, 29 May 2002 15:51:35 Members do not see ads below this line. - Help Keep This Site Online - Signup

- As mentioned in earlier post, fuel pump comes on when 27-30 fuse is jumped.

- Have a spark (at least at #1) while cranking. Assume I have spark elsewhere too, or it would start and run rough, right?

- Tach stays dead at 0 while starter cranks. When the engine "tries" to start (which it sometimes does, before immediately dying), tach jumps up to about 1k.

So it seems like there's fire, but maybe no gas. Fuel pump works, but maybe something wrong with gas delivery between pump and injectors, or problem with injectors themselves?

J.B. posted the LH 2.4 tests. Bentley has a nice section on these, both a "fuel injection component test", and a table of "fuel injection on-board diagnostic fault codes"... is this the next step I should take?

The other remaining theory is that I screwed up a wire somewhere, either in the bundle going to the injectors that passes by the A/C hoses, or in the bundle down by the radiator drain. How on earth could I figure out which one got bumped and is causing the problem?

A final thought... maybe the AMM got disturbed whilst I was removing and checking air filter. Bentley seems to suggest that bad AMM wouldn't usually cause starting problems though..true?

Thanks again all. Without this board there might be a brick through the windshield by now.

'Roo

posted by 128.42.176...

Posts in this Thread:

Car Won't Start, Mr. Science, Wed, 29 May 2002 15:51:35
- Intermittent starting problem -- starter just buzzes, Eric Zimmerman, Mon, 9 Sep 2002 12:06:54
- Re-check Vacuum Hoses, JonG, Fri, 31 May 2002 14:23:21
- Running out of juice...please help, Mr. Science, Fri, 31 May 2002 00:17:01
- If we assume the problem is the tach signal.., Mr. Science, Thu, 30 May 2002 14:57:40
- Update - Got Spark, Got Fuel Pump, still no start, Mr. Science, Wed, 29 May 2002 21:50:50 <-- Viewing This Message
  - More info - fuel pump not pumping while starter cranks, Mr. Science, Wed, 29 May 2002 23:37:32
    - jumper the pump & see if it starts, JimBlake , Thu, 30 May 2002 12:11:56
      - Re: jumper the pump & see if it starts...yup, JohnK, Thu, 30 May 2002 12:57:58
        ECU, JJ, Thu, 30 May 2002 14:28:36
        How did you rule out fuel pump relay? n/m, Mr. Science, Thu, 30 May 2002 14:34:12
        replaced them, JJ, Thu, 30 May 2002 15:01:31
        If there's fuel in the rail, it starts..momentarily, Mr. Science, Thu, 30 May 2002 14:24:48
        carpet, JJ, Thu, 30 May 2002 14:44:08
        Thanks JJ, I'll try again n/m, Mr. Science, Thu, 30 May 2002 14:53:34
- Re: Car Won't Start, burlyb, Wed, 29 May 2002 16:37:32
  - Re: Car Won't Start, Mr. Science, Wed, 29 May 2002 16:49:28
  - Re: Car Won't Start, tek, Wed, 29 May 2002 16:40:37
- Re: Car Won't Start, steven, Wed, 29 May 2002 16:16:19
  - Re: Car Won't Start...open Bentley manual, JohnK, Wed, 29 May 2002 16:24:47
    - Have been through sequence in Bentley, Mr. Science, Wed, 29 May 2002 16:44:38
      - Re: Have been through sequence in Bentley, JimBlake , Wed, 29 May 2002 17:20:15
      - I understand now how to check for spark.., Mr. Science, Wed, 29 May 2002 17:00:21
        Re: you will solve it...take your time, JohnK, Wed, 29 May 2002 17:27:19
        Fuel Pump works..., Mr. Science, Wed, 29 May 2002 19:03:29
        hey ROO, check this out..., JimBlake , Wed, 29 May 2002 20:57:29
        LH 2.4 component checks, JimBlake , Wed, 29 May 2002 21:06:14

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