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Search: Posts Made By: ischmitz
Forum: Porsche 911 Technical Forum 01-13-2021, 10:11 PM
Replies: 47
Views: 2,156
Posted By ischmitz
Huh, come again!? Honestly a statement like that...

Huh, come again!? Honestly a statement like that is equivalent to saying ďthe internal cylinder illumination wasnít bright enough so I replaced the flux capacitorĒ.

Transistors are semiconductor...
Forum: Porsche 911 Technical Forum 12-18-2020, 01:15 PM
Replies: 20
Views: 1,022
Posted By ischmitz
Fortunately, thatís one of the easiest conditions...

Fortunately, thatís one of the easiest conditions to diagnose with a cheap multimeter.
Forum: Porsche 911 Technical Forum 12-17-2020, 11:05 AM
Replies: 20
Views: 1,022
Posted By ischmitz
Do we even know if it's the DME or the DME relay...

Do we even know if it's the DME or the DME relay the OP is referring to? SmileWavy
Forum: Porsche 911 Technical Forum 12-16-2020, 05:01 PM
Replies: 20
Views: 1,022
Posted By ischmitz
Interesting - the OP refers to the DME (the...

Interesting - the OP refers to the DME (the computer under the drivers' seat with a 35-pin connector). Some respond referring to the DME relay (a small black box the size of a matchbox). The DME...
Forum: Porsche 911 Technical Forum 11-26-2020, 05:47 PM
Replies: 2
Views: 453
Posted By ischmitz
It's either one of the harness, a poor...

It's either one of the harness, a poor connection, or the DME itself. Just ohm out from the injector connector to pin 17 of th 55-pin DME connector. There is one 12-pin connection named T31 where the...
Forum: Porsche 911 Technical Forum 11-24-2020, 09:14 PM
Replies: 16
Views: 677
Posted By ischmitz
odd, that he's wearing it for the...

odd, that he's wearing it for the video....indead. But the stainless steel version is probably not scratching as quickly as the WG version
Forum: Porsche 911 Technical Forum 11-24-2020, 09:07 PM
Replies: 16
Views: 1,003
Posted By ischmitz
A simple timing light with the trigger clamp on...

A simple timing light with the trigger clamp on the spark plug wire will tell you if you have spark. Depending on what CDI box you have (stock or aftermarket) you should verify if you can hear the...
Forum: Porsche 911 Technical Forum 11-07-2020, 07:34 AM
Replies: 47
Views: 2,156
Posted By ischmitz
An intermittent flywheel sensor is more like an...

An intermittent flywheel sensor is more like an ON/OFF switch. The engine wouldn't even stumble or sputter. The engine in the video runs on a weak spark that's often caused by a compromised DME.
Forum: Porsche 911 Technical Forum 11-07-2020, 06:39 AM
Replies: 47
Views: 2,156
Posted By ischmitz
This is typical for weak spark and likely the DME.

This is typical for weak spark and likely the DME.
Forum: Porsche 911 Technical Forum 10-30-2020, 01:01 PM
Replies: 62
Views: 16,263
Posted By ischmitz
Hey Jeff, Bosch made these 8-pin CDI boxes in a...

Hey Jeff, Bosch made these 8-pin CDI boxes in a couple of different configurations. Depending on the model the trigger input is either classic points or a VR sensor (Porsche 930, 935, etc.). Some...
Forum: Porsche 911 Technical Forum 10-29-2020, 08:57 PM
Replies: 30
Views: 1,028
Posted By ischmitz
If this is related to the pressure washing water...

If this is related to the pressure washing water could have gotten into the poor/old insulation of the flywheel sensors. This would short one or both and prevent starting. Cranking won't be affected...
Forum: Porsche 911 Technical Forum 10-24-2020, 09:18 PM
Replies: 13
Views: 644
Posted By ischmitz
Measure the FW sensors: Disconnect the DME and...

Measure the FW sensors: Disconnect the DME and use an Ohm meter for resistance and check both. They need to measure around 1000 Ohm. Then, crank with DME disconnected and measure AC voltage of both...
Forum: Porsche 911 Technical Forum 10-23-2020, 01:34 PM
Replies: 8
Views: 534
Posted By ischmitz
I,m by far not as experienced as Bill or Walt but...

I,m by far not as experienced as Bill or Walt but the two data points I have support what they say. I am running a slightly tuned 964 3.6 with the original '74 915 in my car for more than 50k miles...
Forum: Porsche 911 Technical Forum 10-05-2020, 09:22 AM
Replies: 55
Views: 1,810
Posted By ischmitz
Peter, I was assuming a stock 83 - 89 3.2...

Peter,

I was assuming a stock 83 - 89 3.2 Carrera setup as shown below since you never mentioned anything about your aftermarket setup:

http://forums.pelicanparts.com/uploads26/321601912533.jpg...
Forum: Porsche 911 Technical Forum 10-04-2020, 12:14 PM
Replies: 55
Views: 1,810
Posted By ischmitz
See below were the access hole to the adjuster is...

See below were the access hole to the adjuster is pointed out by the red arrow. That hole is normally covered by a plastic cup flush with housing. You need a pick to remove the plug to gain access to...
Forum: Porsche 911 Technical Forum 10-04-2020, 11:32 AM
Replies: 55
Views: 1,810
Posted By ischmitz
So thatís scenario (1) and would explain what is...

So thatís scenario (1) and would explain what is going on. Mixture is adjusted with the bypass screw in the AFM. If itís all the way closed the AFM door deflects more at idle making the mixture...
Forum: Porsche 911 Technical Forum 10-04-2020, 09:51 AM
Replies: 55
Views: 1,810
Posted By ischmitz
OK, that is good progress and I agree with your...

OK, that is good progress and I agree with your conclusion: The ICV and the driver electronics in the DME for the ICV are fine. So moving on to other areas:

I have a slight concern when say you...
Forum: Porsche 911 Technical Forum 09-25-2020, 01:56 PM
Replies: 34
Views: 4,991
Posted By ischmitz
Dwell is not important for the simulator. The...

Dwell is not important for the simulator. The 3-pin CDI will release its spark at the exact moment when the points open. The simulator most likely has an IGBT or MOSFET that switches on and off with...
Forum: Porsche 911 Technical Forum 09-18-2020, 01:20 PM
Replies: 55
Views: 1,810
Posted By ischmitz
To the OP: All your observations so far are...

To the OP:

All your observations so far are consistent in that the idle control loop isn't stable. Once you jumper the diagnostics port or disconnect the ICV the engine idles fine. But as soon as...
Forum: Porsche 911 Technical Forum 09-18-2020, 12:23 AM
Replies: 55
Views: 1,810
Posted By ischmitz
The key for this test is to observe whether the...

The key for this test is to observe whether the ICV slams all the way open or shut when you reconnect it. If that isnít the case the signals and the DME are fine.

As stated several times before I...
Forum: Porsche 911 Technical Forum 09-10-2020, 09:36 AM
Replies: 55
Views: 1,810
Posted By ischmitz
The OP has established that the ICV is properly...

The OP has established that the ICV is properly controlled by the DME (itís vibrating). A damaged ICV or DME usually slams the valve fully open or fully shut.

If the ICV moves properly, isnít...
Forum: Porsche 911 Technical Forum 09-05-2020, 12:20 PM
Replies: 1
Views: 220
Posted By ischmitz
Unfortunately that sounds like the DME needs to...

Unfortunately that sounds like the DME needs to be repaired. The 964 DME isnít known to develop cold or cracked solders like the earlier versions. Itís more likely the output stage failed.

Ingo
Forum: Porsche 911 Technical Forum 08-31-2020, 08:00 PM
Replies: 23
Views: 1,271
Posted By ischmitz
Wow - looks like you dodged a bullet there. This...

Wow - looks like you dodged a bullet there. This wouldíve gotten ugly once the flywheel let go.

And cudos to running the engine with chain housing covers off. You donít see that every day.
Forum: Porsche 911 Technical Forum 08-26-2020, 09:27 AM
Replies: 55
Views: 1,810
Posted By ischmitz
https://uploads.tapatalk-cdn.com/20200826/68188302...

https://uploads.tapatalk-cdn.com/20200826/68188302ba89b31a63d6b6eedd350b7e.jpg
Forum: Porsche 911 Technical Forum 08-25-2020, 07:27 AM
Replies: 55
Views: 1,810
Posted By ischmitz
The idle control valve is always active...

The idle control valve is always active (vibrating) but the DME controls it differently depending on the status of the idle micro switch.

Once the idle switch is activated different maps for fuel...
Showing results 1 to 25 of 500

 
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