deranged

Perhaps....

It may be that my description was not shift related or I was not making myself clear.

My symptoms were only noticable once the vehicle was up to operating temp. Then, I could get no hard throttle shifts. On normal throttle there was no problem with shifting or hesitating. The condition only appeared when I was full throttle on the pedal.

I can only report my experience. I have been looking for a solution to this issue for MONTHS, with a lot of suggestions to check this and that, which I did, but with no successful outcome. With 60k original miles, I felt it could not be a major issue.

It was mentioned to check FUEL PRESSURE REGULATOR, which held vacuum, but I replaced it anyway with no success to the issue.

944 606 115 00

However, the above part number part resolved the problem.

Originally I thought the harness itself, the male and female connectors were the issue. But replacing them did nothing to alleviate the issue. Only after installing the above part number part did the problem end.

Now the vehicle runs flawless, like it should, or as I think it should, with unbelievable pickup, high speed cruise and passing abilities.

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928 Automatic 86

deranged

Warning Signs of a Bad Crankshaft Position Sensor

Other Disruptions in Engine Function

One of the most common effects of crankshaft position sensor failure is visible on the engine function of your car. As the sensor utility deteriorates, it affects regular functions like acceleration, ignition, idling and speed fluctuations. Each of these functions experience abnormal patterns, resulting from actions not initiated by the driver. If you are experiencing any such car troubles—sudden disruption in acceleration, for example—it might be time to overhaul the crankshaft position sensor.

Read more: http://www.doityourself.com/stry/war...#ixzz3Q46QiLRn

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928 Automatic 86

Hilton

The crank reference sensor in a 928 (from 85-95 in US market) either works, or the car will not start or run. There it no intermittent-running-issue relating to it with the way LH injection works. If it fails intermittently in a 928, then at corresponding times, the engine will die (no spark and fuel pump shuts off - both determined by the ECU in the absence of the crank reference signal) and the car won't run or start. The common intermittent mode for this failure in a 928 is once the engine gets warm the car dies - the block expands as it warms, moving wiring and breaking the contact of the crumbled connector or moving the crumbling wiring.

Glad to hear its fixed - hopefully something you did in the parts swapping has hit the nail on the head.

In case it comes back:

If the car runs ok under cruise conditions and at idle, the WOT switch is the logical place to start. Put a meter on the pins at the LH connector and check for shorts, continuity breaks etc while wigglng all parts of the harness.
After that, check things which would be affecting fuel calculations under WOT conditions - MAF sensor, Temp II sensor, etc.

deranged

Thanks for the input, and perhaps it is "generic crap" for you who may be the expert but who offered no comment on how I might correct my issue when I had one. But for me ANY INFORMATION I find on the internet ASIDE FROM THIS FORUM that might assist me in diagnosing and correcting a problem is not "generic crap" and is therefore potentially helpful.

It is interesting that I seem to have found my solution to a very long and frustrating problem OUTSIDE this forum. That said, I retain the respect for the forum to the degree it is helpful to me, which in this particular case it was not.

My issue remains corrected due to the repair I have shared with the others. In my experience, a crankshaft reference sensor that is about to fail but has not yet failed CAN and DOES reveal its potential to fail in symptoms I have described since nothing else corrected the original issue I described.

Perhaps you did not read through the previous posts. As previously stated all these parts you suggest have either been replaced or have been inspected and shown to have no issues.

There is a great deal of talk on this forum about electrical connections; clean the grounds, clean the connectors, take out the fuse panel, clean the corrosion, even if there is none. Certainly I have followed this guidance. All this cleaning of electrical contacts suggests things will either not function CORRECTLY or up to their full potential, or not function at all due to poor electrical connections. In my case, I maintain the particular part previously mentioned did not fail, but was failing. As to the WHY or HOW of this, I have not a clue. And if you will pardon my saying so, neither do you. Electrical connections that are not accurate or true can produce issues that affect various things which in turn affect OTHER things, just as a spark plug fouled or injectors fouled will produce various symptoms before they fail.

Regarding the sensor, NO signal, I agree, will disable a vehicle. Potentially, a WEAK signal can and does produce intermittent activity that affects other components.

If replacing the sensor has not corrected the issue originally mentioned, then the problem still exists, somewhere. Correct?
Then, it seems the sensor is "masking" the issue that I no longer have or is no longer appearing.

Outside this forum, there is an overwhelming consensus that suggests:

"They (CRANKSHAFT POSITON/REFERENCE SENSOR) are typically magnetic sensors that lose their sensitivity over time, and their impending failure can cause rough running, hesitation, stalling or even eventually failure to start."

Lose their sensitivity over time leads to impending failure. The word IMPENDING means HAS NOT YET HAPPENED. The word INEVITABLE is synonymous with the word IMPENDING.

PATIENT - "Doctor, my foot has a nail in it and in that area it is very sore, and bleeding."
DOCTOR - "Mr. Smith, your foot is not sore NOR bleeding because you have a nail in it."
PATIENT - "Oh, ok, thank you doctor. I was mistaken. Then what IS the problem?"
DOCTOR - "I have no idea, but the nail is not it."


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928 Automatic 86

M. Requin

I am glad you found the solution to your problem, but although technically you did find it outside this forum itself, Carl is certainly one of the mainstays of the 928 community (and a frequent contributor here) so according to your own post, it was in the 928 community, if you will, where you found your solution. Your contribution to the forum is noted, but the tone could have been a little lighter in your last post.

deranged

Could you not have used softer words? I am very delicate, and so as to not bruise my very fragile ego could you kindly refrain from this sort of chastizing in the future?

I find it quite interesting your only comment was with regard to where I found the solution rather than recognizing a misperception shared by others on this forum about crankshaft
sensors and their behavior.

For your own information, I am quite aware of who Carl is. Carl's words on his site CONFIRMED what I had already researched and found through the "generic crap" that was found elsewhere.

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928 Automatic 86

Bill Ball

My comment wasn't meant to say it is not possible for the CPS to "fail" in this manner, but just to say it is outside the usual understanding of how it works in the 928. There have been any number of fixes for performance issues reported here over the years that don't make apparent sense, so your report is noted. While when we hear hooves hitting the ground, we should think of horses, occasionally a zebra shows up.

deranged

lol...........I understand completely, Mr. Ball. Thank you.

I think openmindedness is essential when working on these excellent vehicles. I have enjoyed doing so immensely, in spite of the very often frustrating encounters I have experienced.

I think anyone who is interested in purchasing a 928 as a project car needs to understand the qualities of openmindedness and PATIENCE will be necessary.

I hope you did not find my comments personally offensive to you, Mr. Ball. Certainly that was not my inention.

And thank you for your attentiveness.

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928 Automatic 1986