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one injector>>
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
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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...

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