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914World.com _ 914World Garage _ Another Mountain to climb

Posted by: DNHunt Dec 16 2004, 07:57 AM

I feel like one of those guys in the old black and white pictures who's cranking the engine by hand and finally gets pissed and kicks the car. I'd like to beat the shit outa the thing. I fixed the power to the starter and got it cranking, got switched 12V from the wire to the coil primary, found a short to ground in a plug that was shorting the switched 12V and tried to fire it up. NO GO!!!! ARGH!!!!.

So this morning I've been searching through the MS forums. It could be a fried transitor, mis-wired cable, wrong output selected, signal inverted, a bad EDIS Module, or the wrong polarity on the VR sensor. I'm damn near lost.

Dave

Posted by: skline Dec 16 2004, 08:55 AM

I wish I could help you, but I have never played with a Megasquirt before. If it were carbed and just a regular ignition, I could have it going for ya in about 15 minutes. Dont hurt the car though, its only asking for help.

Posted by: ClayPerrine Dec 16 2004, 09:38 AM

IIRC.. (And I may not, it's been years since I worked on one) Ford EDIS uses a "PIP" signal to send timing info back to the computer. If you disconnect the PIP signal, it will force the EDIS into "Limp Home" mode, which runs as an electronic distributor with a fixed advance curve. By disconnecting the signals to the Megasquirt, you should see a spark on the EDIS module.

I could probably tell you more if I knew what make and model Ford the EDIS system was taken from.

Posted by: rhodyguy Dec 16 2004, 09:47 AM

are you sure you are getting atleast a signal from the pickup on the timing gear? carbs and a distributor are more than enough challenge for me. sorry to hear of the problem dave.

kevin

Posted by: Mueller Dec 16 2004, 09:50 AM

Dave,

I have a spare EDIS modual and coil pack if you need to borrow one.

good luck

Posted by: DNHunt Dec 16 2004, 11:50 AM

You're right Clay. First thing I'll do this afternoon is disconnect the PIP and SAW and try it in limp home (fixed 10 degree advance). Thanks for the offer Mike, but I've got 3 of them kicking around.

Dave

Posted by: Aaron Cox Dec 16 2004, 11:55 AM

sounds way too complicated for a 30 yo engine! hope you get it sorted.....