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Search took 0.13 seconds. Search: Posts Made By: ischmitz
Forum: Porsche 911 Technical Forum 08-26-2025, 05:24 AM
Replies: 37
Views: 852
Posted By ischmitz
Just to clarify: disconnecting one bank of...

Just to clarify: disconnecting one bank of injectors at a time isn’t the same as disconnecting all injectors. All 6 injectors are driven off the single low-side driver. Pin 14 and pin 15 inside the...
Forum: Porsche 911 Technical Forum 08-24-2025, 03:43 PM
Replies: 17
Views: 473
Posted By ischmitz
Loren is no longer around here. He (was)...

Loren is no longer around here. He (was) disappeared in 2012:

http://forums.pelicanparts.com/uploads26/loren1756078953.jpg

He's been banned for more than 13 years due to "foul mouth syndrome"...
Forum: Porsche 911 Technical Forum 08-24-2025, 02:00 PM
Replies: 37
Views: 852
Posted By ischmitz
During cranking the GND signal coming from pin 14...

During cranking the GND signal coming from pin 14 and 15 is only about 1 - 2 milliseconds in duration. A NOID light (an LED in a fancy package) will flash very dimly but it's hard to see unless the...
Forum: Porsche 911 Technical Forum 08-24-2025, 01:11 PM
Replies: 37
Views: 852
Posted By ischmitz
The injector wiring is pretty simple. Inside the...

The injector wiring is pretty simple. Inside the ECU is an output stage that provides GND on pin 14 and 15 of the 35-pin ECU connector to fire the injectors. The injectors are two-wire devices with...
Forum: Porsche 911 Technical Forum 08-23-2025, 09:10 AM
Replies: 123
Views: 16,026
Posted By ischmitz
Any updates? Did you ever get a healthy PSEN...

Any updates? Did you ever get a healthy PSEN signal?
Forum: Porsche 911 Technical Forum 08-17-2025, 02:08 PM
Replies: 13
Views: 570
Posted By ischmitz
Glad you found the root cause. Feel free to reach...

Glad you found the root cause. Feel free to reach out if you need help getting your bad ECU repaired.
Forum: Porsche 911 Technical Forum 08-15-2025, 04:39 PM
Replies: 25
Views: 532
Posted By ischmitz
Dru, The primary voltage from the CDI to the...

Dru,

The primary voltage from the CDI to the coil is up to 450V. At that level you might get arcing between the exposed conductors. A simple ohm meter reading won’t identify this.
Forum: Porsche 911 Used Parts For Sale & Wanted 08-15-2025, 08:53 AM
Replies: 1,078
Views: 73,951
Posted By ischmitz
got the same BS too this morning

got the same BS too this morning
Forum: Porsche 911 Technical Forum 08-15-2025, 08:44 AM
Replies: 25
Views: 532
Posted By ischmitz
Looks like you found your issue, good job

Looks like you found your issue, good job
Forum: Porsche 911 Used Parts For Sale & Wanted 08-14-2025, 06:56 PM
Replies: 1,078
Views: 73,951
Posted By ischmitz
Sniper again: Contact Bill, he has a 915...

Sniper again:

Contact Bill, he has a 915 gearbox for '83 911 SC for sale in good condition, here’s his email billswann54@gmail.com
Forum: Porsche 911 Technical Forum 08-13-2025, 08:11 AM
Replies: 25
Views: 532
Posted By ischmitz
yup - some might even remember when Wayne had to...

yup - some might even remember when Wayne had to ban you because people threatened to boycott Pelican Parts with you insulting others as LorenFB :rolleyes:
Forum: Porsche 911 Used Parts For Sale & Wanted 08-13-2025, 06:36 AM
Replies: 254
Views: 14,269
Posted By ischmitz
A 915 SC transmission 8:31 R&P by any chance?

A 915 SC transmission 8:31 R&P by any chance?
Forum: Porsche 911 Used Parts For Sale & Wanted 08-13-2025, 05:31 AM
Replies: 0
Views: 78
Posted By ischmitz
WTB: 915 gearbox for '83 911 SC

I am looking for a working 915 gearbox with 8:31 R&P for an "83 SC. Please let me know what you have.

Willing to pick up in person in SoCal
Forum: Porsche 911 Technical Forum 08-13-2025, 05:21 AM
Replies: 25
Views: 532
Posted By ischmitz
I can only speed for a Bosch CDI box. I assume it...

I can only speed for a Bosch CDI box. I assume it makes its distinct whine when powered.

With a spark plug hooked up directly to the coil output and grounded it needs to produce a spark assuming...
Forum: Porsche 911 Technical Forum 08-13-2025, 03:23 AM
Replies: 123
Views: 16,026
Posted By ischmitz
If PSEN is flatlined you have bus conflicts as...

If PSEN is flatlined you have bus conflicts as the EPROM data outputs will never release the AD bus.

Remove the 8051 and the EPROM from the board and measure resistance of the PSEN line vs GND to...
Forum: Porsche 911 Technical Forum 08-12-2025, 07:33 PM
Replies: 13
Views: 570
Posted By ischmitz
Yes, ^ is a good point. And these gadgets are...

Yes, ^ is a good point. And these gadgets are less than 30$ on evil bay….
Forum: Porsche 911 Technical Forum 08-12-2025, 07:12 PM
Replies: 123
Views: 16,026
Posted By ischmitz
Yes, all logic signals should be close to 5V...

Yes, all logic signals should be close to 5V (high) and 0V (low). Something is funny. PSEN is used for as !OE on the EPROM. Look at PSEN with your oscilloscope and confirm it is swinging between 0V -...
Forum: Porsche 911 Technical Forum 08-12-2025, 01:47 PM
Replies: 123
Views: 16,026
Posted By ischmitz
I haven't gone through all of your data but here...

I haven't gone through all of your data but here are a couple of observations:

PSEN and ALE look different in level. Are you using different probes or is there something wrong with PSEN?

Why...
Forum: Porsche 911 Technical Forum 08-12-2025, 11:02 AM
Replies: 13
Views: 570
Posted By ischmitz
There is no reliable way to identify which sensor...

There is no reliable way to identify which sensor is bad when you have a no-start unless you measure them as described.

If a resistance test fails with an open or you measure see any resistance...
Forum: Porsche 911 Technical Forum 08-12-2025, 06:33 AM
Replies: 13
Views: 570
Posted By ischmitz
Good advise. If one of the sensors is on its way...

Good advise. If one of the sensors is on its way out the other is usually not far behind. Testing them can be done by disconnecting the 35-pin connector from the DME under the drivers seat and...
Forum: Porsche 911 Technical Forum 08-12-2025, 06:19 AM
Replies: 123
Views: 16,026
Posted By ischmitz
Try the following: 1. Set up your logic...

Try the following:

1. Set up your logic analyzer with a short sampling duration of no more than 1 a few milliseconds

2. Use a sampling rate of 5 Mhz or higher to get sufficient resolution, no...
Forum: Porsche 911 Technical Forum 08-12-2025, 04:36 AM
Replies: 123
Views: 16,026
Posted By ischmitz
When using a 27c256 EPROM you put copies of the...

When using a 27c256 EPROM you put copies of the program into the extra space rather than modifying the PCB or jumpers.
Forum: Porsche 911 Used Parts For Sale & Wanted 08-11-2025, 09:51 AM
Replies: 6
Views: 1,217
Posted By ischmitz
Is the transmission still available?

Is the transmission still available?
Forum: Porsche 911 Technical Forum 08-10-2025, 08:07 PM
Replies: 123
Views: 16,026
Posted By ischmitz
Loren, Can’t believe you have the audacity...

Loren,

Can’t believe you have the audacity to peddle your lame company here again !

The OP wants to learn about the DME and instead of being helpful you’re getting on your sad little soapbox...
Forum: Porsche 911 Technical Forum 08-10-2025, 06:12 PM
Replies: 123
Views: 16,026
Posted By ischmitz
are not required for the 8051 to generate the ICV...

are not required for the 8051 to generate the ICV pulse train :rolleyes:
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