<jonb55198@[EMAIL PROTECTED]
> wrote:
>
>The other day my car would not start. The battery is fully charged
>and the starter cranks well. My friend and I did some preliminary
>diagnosis with which we discovered:
>
>1. There is 12V at the ignition coil (both wires to ground).
When you try and start the engine, does it pulse? If not, it's not
getting proper signal.
>2. The resistance/impedance numbers of the coil are within spec.
>3. There is no water in the coil, we displaced it with lubricant and
>the protective boot looked ok anyway.
Makes sense. Coils fail occasionally, but not very often. And usually
when coils fail, it's because they're not being driven correctly.
>4. We hooked up a 2 different spark plugs to the output wire of the
>coil (the wire that goes from the coil to the cap) and then grounded
>it and turned the key into the ON position (but not the start
>position) and did not get any spark.
>5. There is fuel in the rail.
Okay, sounds good.
>My question is, if there is 12V at the ignition coil, and the
>resistance numbers are ok, could it still be a bad coil, or does this
>point to something else like a bad DME/ECU, a bad DME Relay, a bad
>crank position sensor or speed sensor?
The coil is fine. One of these sensors is bad, or the ECU is bad.
Pull the codes off the ECU and see what the ECU has to say.
>I've read in other posts that when these sensors go bad, there is no
>spark... but did the authors of these posts mean to write that when
>these sensors go bad, there will NOT be 12V at the coil? Please
>help. Thanks.
There will almost always be 12V at the coil.
--scott
--
"C'est un Nagra. C'est suisse, et tres, tres precis."
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