Extremely High Voltage 25V+++

[trconn]

I'm in Long Beach CA.
When you say test bench, hoping there is something more sophisticated than the stim?
I'd be happy to have someone look at it. I'm starting to get a bit frustrated

[rickb794]

Have you run it on a stim?

My point is if it is not repeatable off the car the problem is in the car.

[trconn]

Uneven and 434.jpg

16621volts.jpg

Very confused!
Drove the car today, cold start a little rough, since I still haven’t experimented with WUE. Then ran great! The only glitch was that there was a brief voltage spike to 1662v!!! The voltage gauge on screen was pegged most of the time.
The real problems surfaced later after a warm start. Engine ran terrible, uneven idle, AFR all over the place and another brief voltage spike, this time “only” to 443.4v.
After starting I drove a couple of blocks and the engine died. Restarted with difficulty and after about a mile things evened out and it drove OK but the idle was high and the volt gauge in TS was pegged.
I also noticed that when the voltage was reading normally in TS the AFR meter and TS were in agreement. But when the volt gauge pegged, the AFR meter would read about 2.0 lower than TS.
Another thing that bothers me is the jumper on D2, which was replaced with the backwards zener diode is still in place. The instructions say to remove it after testing with the stim. I tried that and it was a no start. Should this jumper be there or not?
Sorry if I’m a little slow on the uptake, the Apple IIe was the state of the art computer when I graduated from college.
Thanks,
-TR Conn

Sorry the .msl files were too large to be loaded.

[kjones6039]

the .msl files were too large to be loaded.

Can you try zipping them? I think it is important to see them.

Ken

[trconn]

Zipped files - Hope it works

[kjones6039]

Yep..... That worked!

Pretty wild looking voltage going on there. Unfortunately, the resolution to your issue is way above my pay grade!

Ken

[trconn]

Ken,
Thanks for following along and making suggestions.
Unfortunately the warm start file with the roller coaster idle is still too big after zipping.
Next thing is going through all of the wiring to the sensors and computer. See what happens.
-TR
Made another warmish start with the uneven idle and rising voltage.

[trconn]

Yep, I screwed up!
On the suggestion that the problem may be in the car and not the MS I checked over the wiring today.
I checked the resistance at pin 19 on the harness to the chassis. "0 ohms"!
Further checking revealed that I had hooked the sensor ground to the coil ground (pin 7). I made the stupid assumption that since the wire on the harness was b&w that it must be the sensor ground.
After a simple rewiring job, everything seems to be as it should. I just got back from a test drive with a big smile on my face.
Thanks to all who provided input.
-TR

[kjones6039]

Ya gotta love it when a plan comes together!!

Glad to see you got it solved.

Ken