[Main C900 Bulletin Board | BBFAQ | Prev by Date | Next by Date | Post Followup ] Member Login / Signup - Members see fewer ads. - Latest Member Gallery Photos one injector>> Like This Post: - Subscribe to Daily Digest for this Bulletin Board Posted by JimBlake [Email] (#141) [Profile/Gallery] (more from JimBlake) on Wed, 24 Apr 2002 16:26:00 In Reply to: Re: Help ! Check engine light driving me crazy (long), Mike M 900S, Wed, 24 Apr 2002 15:41:07 Alert me when someone posts in this thread: Members do not see ads below this line. - Help Keep This Site Online - Signup

Yes. If only one was bad, I'd expect that plug would look different.

But maybe... If it just suddenly (completely) quit working, then there'd be no fuel in that cylinder to cause fouling. I don't think it would fail that way, though. Besides, full-time all-the-time missing on one cylinder would really be noticeable - it'd run like s(*$#^!

Here's how to check stuff... assuming you already know how to retrieve fault codes.

For these tests, you ground the jumper BEFORE turning on the ignition. DON'T start the engine. When the check engine light (CEL) flashes once, open the jumper and listen for the fuel pump to run for about 1 second.

Ground the jumper till the CEL flashes once, then open it for the next test. After you're done with each test, ground the jumper till the CEL flashes once, just like you're trying to read the next fault code.
Each test, in this order, displays a code like the faults:

1) (no code) fuel pump - listen, it'll run for about 1 second
2) 12411 fuel injectors - listen (unplug individually if you want)
3) 12412 AIC valve - listen, it'll open/close once per second
4) 12413 ELCD valve - listen, it'll cycle once per second
5) 12421 "drive" signal, automatic - stops flashing when you shift D to N
6) 12424 throttle closed signal - stops flashing when you just open throttle
7) 12431 throttle open signal - stops flashing when you fully open throttle

Have fun & let us know what happens. I'm kind of surprised this isn't more prominent in the repair manuals...


posted by 131.184.14...

• Help ! Check engine light driving me crazy (long), Mike M 90 900s auto na, Tue, 23 Apr 2002 22:53:52
  • Re: Help ! Check engine light driving me crazy (long), JimBlake , Wed, 24 Apr 2002 09:24:11
    • Re: Help ! Check engine light driving me crazy (long), Mike M 900S, Wed, 24 Apr 2002 15:44:10
    • 1990s have the cycle-the-injectors test function, too>, Micah in NC, Wed, 24 Apr 2002 13:12:20
      • can you scan the procedure and post it here or a link?, KeithG, Wed, 24 Apr 2002 16:43:47
        • read my "one injector" note... n/m, JimBlake , Thu, 25 Apr 2002 07:49:53
          • Great info - thanks! n/m, KeithG, Thu, 25 Apr 2002 10:49:26
        • Yup. I'll try to do that within a week or so. n/m, Micah in NC, Wed, 24 Apr 2002 16:55:08
    • Re: Help ! Check engine light driving me crazy (long), KeithG, Wed, 24 Apr 2002 09:45:47
      • Re: Help ! Check engine light driving me crazy (long), Mike M 900S, Wed, 24 Apr 2002 15:41:07
        • one injector>>, JimBlake , Wed, 24 Apr 2002 16:26:00 <-- Viewing This Message
          • Re: one injector>>, bhe, Mon, 29 Sep 2008 17:52:39
          • Re: one injector>>diagnoses, david bhagwandeen, Mon, 26 Sep 2005 03:24:29
            • Re: one injector>>diagnoses, JimBlake , Mon, 26 Sep 2005 07:02:51
          • Re: check engine flashes., Carolyn Davies, Sun, 13 Jun 2004 12:21:27
            • what car??, JimBlake , Mon, 14 Jun 2004 07:49:33
  • Check Engine Light Story, Brian, Wed, 24 Apr 2002 00:31:21
    • oil leak and CE light are mutually exclusive n/m, KeithG, Wed, 24 Apr 2002 09:46:31
  • Re: Help ! Check engine light driving me crazy (long), Boomer, Tue, 23 Apr 2002 23:13:43

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