no spark 965

[Black_Hat]

debugging a no spark issue on a 1991 turbo. I stalled the car putting up on ramps before a major service and inadvertantly left the ignition on. Well the car was no start before service.
I have Batt voltage to the ez69 , both posts of the coil 1 & 15 light up a test light when cranking BUT one side does not flash.

coil pn 965-602-116-00-M14

The manual ohm for coil primary & secondary to center post ( - 1 = 5.0 - 7.2 ohm) and ( + 15 = 0.4 - 0.6 ohm ) . I have 9.75 for both primary and secondary to center post and 0.0 across 1 & 15 .

1. is that the correct value for the coil ? if so i have a bad coil
2. will an after market MSD coil work (has anyone tried it)

very little info on coils other than replace and see.

thanks,

Stefan

posted rennlist as well

[AFM744]

I know people have blown up the EZ69 before, but you're sure it's an ignition failure? You checked for spark? It's either no-spark or no-fuel, and unless I was SURE it's spark I'd be looking at fuel pump relays, overboost switch, etc first, IMHO.

[Black_Hat]

No spark
both fuel pumps running

[lucittm]

Black_Hat,
Are your measurements with the wires connected or not to the "coil". Let me know and I will run out to the garage and check mine for you to compare.

BTW, the EZ69 cars do not have coils, they are "ignition transformers" because they have the ignition module as part of the assembly. This is part of the reason they are so expensive, different P/N. The DME cars have one (or two) of the ignition modules installed in the ignition control unit.

I talked to one of the guys at Andial about making up a dual EZ69 and dual ignition transformer setup for twin spark using an Andial crankshaft sensor splitter. He said as far as he knew it had never been done using their parts.

I had a similar problem to yours but I had no voltage to terminal 15. It turned out to be a burnt wire in the fuse panel. If you have battery voltage to the EZ69 that means your ignition relay is good, check for the ignition pulse output on terminal 16 of the EZ69 after disconnecting the other end of the wire on the ignition transformer. It is a 1.5mm white wire (just poke a thumbtack into the wire, it will seal itself back up). If it is there, you have a bad ignition transformer or a broken wire. If it is not there, and the test below is good, you have a bad EZ69.

Also you can check the flywheel speed sensor pulse going into the EZ69 on terminal 7. There is a speed sensor plug/jack in the engine compartment, make sure that connection is good.

Mark

[tj930]

What are the symptoms of the overboost switch going screwy? (Doesn't the overboost switch temporarily cut the fuel pumps? Or does it cut the spark?)

For the first time ever in my 6+years of ownership, the car has started behaving like a temperamental old crate - difficult to start, cutting out on me when I was just rolling along at about 50mph in 4th gear, then absolute refusal to start when stuck at the side of the road.

Checked the fusebox (obviously) and the relays appear fine. Just had the fuel pumps replaced (and I can hear both of them - they're really loud now).

Coil has just been replaced, distributor cap replaced last year along with rotor, sparkplug leads about 2 years old, battery fairly new and charged up...

Hmmm... Overboost was something I hadn't thought about... (Suspect the electrics, since can smell fuel when the I/C is removed.)

[Black_Hat]

the measurements are no wires , coil on bench - out of car
thanks for the help
stefan

[lucittm]

Stefan,
Sorry it took so long, I had to take a conference call in the middle of the measurements.
Here's what I measured on my digital Fluke meter:
-1 to center post = 9.12 Kohms
+15 to center post = 9.12 Kohms
-1 to +15 = .7 ohm
Any point to ground = Infinite ohms

Are you sure about the factory measurements? Are your measurements ohms and not Kohms?
In my Bentley manual, Technical Data Without Guesswork, on page 164 it listed the primary winding (-1 to +15) = 0.4 - 0.6 ohms. It listed the secondary winding (+15 to center post) = 5.0 - 7.2 Kohms. My ignition transformer reads a little bit higher.

I don't know how you can measure resistance across the secondary (15 and center cap) and 0.0 for the primary if you also read resistance across -1 and the center cap (this would be both primary and secondary together 9.75 kohms + .7 ohms).

Good Luck,
Mark

[Black_Hat]

Thank YOU
Coil eliminated
on to
crank sensor and ez69

[Black_Hat]

"check for the ignition pulse output on terminal 16 of the EZ69 after disconnecting the other end of the wire on the ignition transformer. It is a 1.5mm white wire (just poke a thumbtack into the wire, it will seal itself back up). If it is there, you have a bad ignition transformer or a broken wire."

I have good flashing on the white wire from terminal 16 of EZ69 .

checking for broken wires ect ..

[Black_Hat]

center pin on crank sensor has good flash when turning engine over but It was plugged into
harness.