92 No Spark Condition

[rdkauf]

My 92 Plymouth Voyager died, just out of the blue, while idling at a stop light, and won't start. Towed it home and checked for spark by removing a spark plug. I do not get any spark. Checked for cam shaft rotation in oil fill hole. OK--valves are operating.

By following the book diagnosis for "No Start", I've check the B+ voltage going to the ignition coils with the connector disconnected. Book says in the ignition "on" position, I should get approx. 9V for about one second, then drop to zero (because there is no camshaft pulse sensing since it is not turning. I get 0V with no pulse cycle from the time the switch is turned on. Same result (0 volts at coil) when cranking engine.

I think I've cleared the camshaft sensor as the problem, by checking voltages from it when engine is cranked.
(3 wires from sensor -- B+ voltage, Ground, and PulseSensing) When checking voltage from what appears to me to be the sensor wire, I get pulses when the engine is cranked from the Camshaft Sensor. So I assume the cam sensor is OK. I see pulses and then goes low for about a second after cranking is stopped, then goes high. (kind of what I think I would typically see at the ignition coil -- but I get nothing there!)

I've noticed that if I leave the ignition switch in the "on" position for about a minute or so, the automatic shutdown relay will intermitently click and some times even start to chatter at random. When this happens I get B+ voltage at random to the ignition coil when the automatic shutdown relay clicks or chatters.

Don't know what to check next. I've visually checked connectors for corrosion and bad wiring. I'm beginning to suspect the Engine Control Unit.

I get no code readings, and don't know where to check next. Any ideas?

Haven't been able to find the crankshaft sensor yet. Book says it is on bell of transaxle with bottom of sensor positioned by the drive plate. (Too much junk in the way for me to see it.) Hmmmmmm.

Thank you in advance for your help!
Roy Kaufman

[slantsixness]

Roy,
Your crank sensor would throw a code.
but it could be bad.
But you could have a bad SMEC (computer)?
coil could be bad?
one of the ignition fuses or a fuse-link could be bad.

By the way, Which motor do you have?

Slantsixness

[rdkauf]

Solved the problem on my 92 Plymouth Voyager "No Spark Condition....There was a problem with the engine control unit (engine computer). Replaced the engine computer and that fixed the problem!