It runs!
Even though every plug wire showed a spark when tested I decided to pull a
plug to watch the plug fire and it didn't fire. Pulled another one, no
spark. So even though the wire arcs does not necessarily mean the ignition
is working properly. Even the FSM said if there's a spark off the coil
wire, you can assume the ignition system is working properly! I then
noticed the coil wire was touching the valve cover and saw carbon deposits
where it was arcing. When that happens, it ruins the coil. Replaced the
coil and wires and fired right up!
So now I got an extra PCM which is fine since I'll need to send one away to
be flashed for the 408 and will always have a spare on hand for trouble
shooting.
-----Original Message-----
From: owner-dakota-truck@bent.twistedbits.net
[mailto:owner-dakota-truck@bent.twistedbits.net] On Behalf Of Ray Block
Sent: Wednesday, January 24, 2007 8:40 PM
To: dakota-truck@dakota-truck.net
Subject: RE: DML: Re: Dakota Won't Start
> -----Original Message-----
> >>>Still no go... Here's what I did so far:
> >>>
> >>>Crank Position Sensor showed resistance so I replaced it.
> >>>Cam Position Sensor tested good.
> >>>Fuel pressure at 49 PSI.
> >>>Spark from all wires.
> >>>Watched distributor rotor for smooth rotation. No indication of
> >>>broken cam or distributor teeth.
> >>>Looked for any signs of wire harness corrosion and checked all grounds.
> >>>After all that...Replaced PCM! And...STILL NO GO!!!
> >>>Any other ideas are greatly appreciated!
> >>>
>
> I was about to say that you would not have a broken timing chain if
> the distributor is turning, but then I stopped and had to think, is
> the distributor powered off the cam or the crank?
As Tom suspected, the distributor is powered by the cam so if the rotor
turns while cranking, the timing chain is not broken.
All it takes for combustion is air, fuel & spark. Compression helps turn
that combustion into running an engine but all these events must take place
at the right time. You're missing something. If you really have spark,
I'd be wondering if the injectors are actually firing. You might try
pulling a plug, crank the engine over for a bit and see if you smell fuel in
that cylinder. If no, then you have a fuel delivery problem. If yes, you
have an ignition problem.
Ray
http://www.dragtruk.com/ENTRIES/20KM1FD2KWBP.html
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