New Jeep application will not start

pavel5 · Post by **pavel5** » Mon Apr 19, 2010 12:59 am

Hello gentlemen: So far I've managed to get a wonderful backfire out of the old 1965 Willys Jeep OHC Tornado straight six but she just won't catch. I have the impression that there may be a bit too much advance in "Limp Mode" for this 'stone Age' engine to start. She cranks but then seems to stop dead... then cranks again.

Forgive my lack of knowledge, but what would you suggest for my first lines of attack?

I have not hooked up the Megajolt unit electrically yet, only the EDIS and Coilpack. Is that a mistake?

Thank you

PS, It was fun to set off all the dogs in the neighbourhood! Two neighbours came over to see if I had gone 'Postal'.

Post by **brentp** » Mon Apr 19, 2010 3:37 am

Sounds like the firing order might be off on your jeep- as suggested by the backfiring. Any backfiring out the intake as well?

pavel5 · Post by **pavel5** » Mon Apr 19, 2010 8:29 pm

Thanks Brent!

No backfiring out the intake, only had one backfire - doesn't backfire now. I checked the firing order/coilpack hookup and it seems correct to me. Looking at the coilpack with the low tension wires at the bottom (toward you), I have the plug wires hooked up this way:

6 4 5
1 3 2 The firing order is the same as a Datsun 240Z (1-5-3-6-2-4)

Double checked the trigger wheel on the crank - it also seems to be clocked correctly - just like the instructions say.

Now, I admit, my trigger wheel is homemade... should I disconnect and check for pulses at the shielded wires? When I tested the values off the engine, I got about 0.3 milliamp pulses.

Or, would someone suggest a different next line of attack?

Thanks for any help!

a bit perplexed Pavel.

Post by **brentp** » Mon Apr 19, 2010 9:08 pm

The VR sensor connections are polarized. Have you tried swapping the connections to the EDIS module? Try that if you haven't done so.

pavel5 · Post by **pavel5** » Tue Apr 20, 2010 2:28 am

OK, I'll try that tomorrow. While I have the wires exposed, can you give me some hints on the values the sensor should be sending to the EDIS?

Thanks for the continuing lesson!

Pavel

pavel5 · Post by **pavel5** » Sun Apr 25, 2010 11:57 pm

Had time to do some tests today.

Reversed the wires from the crank sensor. Even less signs of life from the engine, so put them back. Checked that power can get through - it can for both wires.

Tested with digital meter ... the sensor wires gave about 0.1 to 0.2 milliamps when cranking. I can't help but wonder if this is enough for the Ford ECU to recognize. Next, will try to move the sensor closer to my homemade trigger wheel and then recheck for spark.

pavel5 · Post by **pavel5** » Fri Apr 30, 2010 12:14 am

Another spectacular ear-ringing backfire today - so there must be a least one spark from time to time!!!

The crank sensor is very close to the trigger wheel indeed - may even be touching. Is that bad?

pavel5 · Post by **pavel5** » Tue May 18, 2010 7:16 am

Success - she runs fine now! The problem was a wiring mistake I made. I got positions 10 and 12 on the EDIS module backwards. In my defence, the wires were colour coded to be connected wrong, but the MegaJolt instructions were correct.