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RWD - 92 240 wagon intermittent no start. Starts right up with a jump.

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92 240 wagon intermittent no start. Starts right up with a jump. 200 1992

Hi Seed,

I copied what you said so, “We and the Board,” could stare at it directly!

“Actually the car does not start fine all other times. It intermittently won’t start in the morning after running fine the day before. Jump brings it back to life immediately.. when it doesn’t start there is little to no crank, then less, then none. 1,2,3.”

This reads out to me as if it’s classic drain down of the battery overnight!

The quickest and easiest way to check for that drain is to disconnect the negative terminal from the battery to leave the battery out of the ball game during the night.

The next thing is to make sure everything thing is turn off in the car.
Then you want put a small automotive light bulb in between the negative cable and the negative post to see if it will light up continuously.

A turn signal bulb is about as large you should use but anything smaller will only glow brighter with the least amount of drainage.
If it does light up, then you need to find out what, is on all the time!
You can get a weak blip from a time clock or intermittent charge up draw of a computers capacitors, of which will quickly settle down to zero.

You will need a Volt Ohm Meter set to the amperage mode and hooked up in series with the load just like the light bulb, to find out how much, in total, is the problem.
0.020 to 0.050 Of an amp or milliamperes is about all that is allowed in an amperage draw load with everything off.
This means glove box lights, trunk lights or even a shorted or stuck closed courtesy light relay. Your car probably has electric windows and they use relays. Some get pretty warm under normal operation. Who knows maybe the rear window defrost is on all the time?
The magnetic coils can short out to ground in “rare” instances.
If you do have a light glowing, try removing fuses, one at a time, until the light goes out, Then note the circuit it came from.

In order for it to go down overnight, it will have to be quite a bit more than the numbers above, or the battery itself is really really funky!
The battery could have the shortened life span, if it does not get a good healthy charge.
It cannot get a full charge from an alternator, if the car never gets to do any long errands or trips.
How long are your trips, each time or the miles between the jumps?
A bench charge and loading test is the only way to truly rule out the battery as being good or bad or needing a longer charge.

The overnight fault is a big clue, electrically and it has a finite answer, lurking about!
You need to do the little test or get a routine going of disconnecting it, to solve what seems to be a failure and it being a “ran down” failure to crank issue.

As far as the Crank Position Sensor, there is not a true test for it.
It’s one of two R&R and cross your fingers devices. The other is the AMM.
The problems with them, is they can cause, a little more “irrational” set of symptoms with the engine actually running correctly.
If it’s failing, it might start out with you not getting some good ole’ ignition sparky in the game, because of no signal.
In that the case, nothing does anything, no matter the number of batteries you jump from.

At least it doesn’t seem logical, but cars don’t think and they leave it up to us, the creators!
The avocado pit is too big too!
That is, According to George Burns, in the movie Oh, God! with John Denver.

Phil






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New 92 240 wagon intermittent no start. Starts right up with a jump. [200][1992]
posted by  Seed  on Thu Mar 28 16:24 CST 2019 >

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