Another "No Start" issue

[jknapp3]

Here's a good one... No Start, I replace the two sensors, and we have ignition! now the next morning, no start, no spark?? I pulled the sensors, played with them, still no start, I pulled the cap and it is new, power to the coil, but still no start. I yelled at it, hopped on my Harley and rode all day. I get back, and for ****s & giggles, I try it, and it fires right up. ????? All I can figure is condensation from the morning, and 88 deg, drys it out?? any ideas?
Let me know...

1987 944 NA.

[Cocacolakidd]

Could be that either the fuel pump or the DME relay is/are acting up...??

[jknapp3]

Well, its a no spark issue, so the fuel pump is out.

[kdjones2000]

Could also be cold solder joints in the DME, if your sensors are new.

[jknapp3]

It's a lovely morning in Central TX, it's 70 out at 7:40 am. And again, a "no start"? So I sprayed a bit of WD40 on some connections, and nothing. So.... DME? (That's in the car, and no condensation there?) Cap & Rotor? The sensors are new, and it did run last night, and rather well... So.... Next.... lol

[jknapp3]

Update! I took the DME out, opened it, (It was tested on 2-1-12, written on it.) Told it is was no better than a Commodore 64, and looks like a worn out HP!(They only know fear!) cleaned it with contact cleaner, the boards, and the plug, both halves, plugged it in, and it fired right up! So... Dirty/Poor connections? Fear? we'll see if it fires up tomorrow morning. If not, I'll look into a re-maned DME. I see them on Eplay for like $400 with warranty. Any opinions are welcomed!

[marbleusmike]

I would keep a small hammer or hard rubber mallet with you and when it acts up try whacking the floor board or if you have it out try tapping the dme and then see if it starts. It would usually start up after a good whack when mine went bad. And if it does then you know the culprit.
If you want to try and solder it yourself get yourself a really good pair of magnification glasses and with some really good light on the subject... and also a nice intricate type (small) soldering iron.
It's tough to see a bad joint with the naked eye!

[jknapp3]

Marbleusmike,
I went out this morning, no start, I did the "Whomp" method, and it fired right up. so... I'm ordering a re-maned DME today. (My wife heard no start, then two thuds, and then it firing up. We laughed for 10 min.

Thanks again. Funny though, on the DME, it's says on the outside, "Tested, 2-1-12" I guess it was tested on its good day. lol

[marbleusmike]

You can try taking it apart and soldering it... it's worth a shot. Then make sure to keep your hammer with you so you don't get stuck.. just in case

[marbleusmike]

Also fyi I fixed mine.. And as soon as I did it, I had a clogged cat problem... Which I thought was still the DME giving me problems.. It just wouldn't stay running. So I bought a DME on line. And it would NOT start AT ALL. I called the place and they said to send both DME's back. They re-soldered mine and sent it back to me. It probably was already fixed by me... It was the old cat that was causing my later problems.
Try fixing it yourself... you'll save money and have satisfaction! Usually the problem is in the solder joints of the ribbon connection that connects the two circuit boards.

[jknapp3]

I thought about that, and well, my piss poor eye sight now, and having I would have to buy a new soldering iron, and a big magnifying glass. And for $350 and a 5 yr warranty, I'll just spend it, and be done. My 912 is a handfull also, but it's easy to fix it, no computer stuff.. lol

[Jeff Laurence]

Also , make sure the battery compartment is sound.. if it does not drain properly, water will run down the wires and into the DME, shorting it out. It always happens at the most inopertune moment.

[hangar21]

Guys, I just replied with similar problem that turned out to be my ignition switch??? (1990 944S2), drop a $113.0 for a new switch and all is well. Good luck, Terry