86.5 5 Speed Driveline Vibration
09-02-2020, 09:29 PM
#16
Rennlist Member
Thread Starter
Talked with the owner a few nights ago and we discussed multiple failure scenarios for these vibrations.
I too have some reservation it being only the TT, but thought to throw it out as a suggestion. Hopefully we'll get the report shortly with a complete diagnosis.
Owner did say how much he appreciated Kevin's and Roger's help with the 928 and what a great 928 owner community we have as 928ers.
I too have some reservation it being only the TT, but thought to throw it out as a suggestion. Hopefully we'll get the report shortly with a complete diagnosis.
Owner did say how much he appreciated Kevin's and Roger's help with the 928 and what a great 928 owner community we have as 928ers.
09-03-2020, 11:12 AM
#17
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110% - Thanks to Kevin and Constantine.
__________________
Does it have the "Do It Yourself" manual transmission, or the superior "Fully Equipped by Porsche" Automatic Transmission?
George Layton March 2014
928 Owners are ".....a secret sect of quietly assured Porsche pragmatists who in near anonymity appreciate the prodigious, easy going prowess of the 928."
Does it have the "Do It Yourself" manual transmission, or the superior "Fully Equipped by Porsche" Automatic Transmission?
George Layton March 2014928 Owners are ".....a secret sect of quietly assured Porsche pragmatists who in near anonymity appreciate the prodigious, easy going prowess of the 928."
09-05-2020, 04:29 PM
#18
Rennlist Member
Thread Starter
Compression Test Results
Owner also thinks the PS coil wire was not fully seated in the distributor cap.
Waiting on the owner to button her up and see if that made a difference.
09-05-2020, 06:53 PM
#19
Rennlist Member
Thread Starter
I need to add another thing...
On two occasions, once while I was driving and once when someone else was driving the timing belt warning was triggered.
Timing belt tension was already checked before these warnings.
On two occasions, once while I was driving and once when someone else was driving the timing belt warning was triggered.
Timing belt tension was already checked before these warnings.
09-05-2020, 10:10 PM
#20
Team Owner
if the tension is good and the belt triggering is going off,
either their is an issue with the belt run OR the sensor wire or connection or the tensioner pin connection is at fault
either their is an issue with the belt run OR the sensor wire or connection or the tensioner pin connection is at fault
09-06-2020, 12:06 AM
#22
Three Wheelin'
Check the orientation of the spade connector on the tensioner arm, it is very easy for it to be up against the center cover. Add some vibration and you can end up with a loose connection that will trigger the warning light. BTDT.
09-15-2020, 11:40 AM
#23
Just adding another data point for all those following along on this thread. I was contacted by the owner of the subject 928 and he said a check of the TT front bearing location found it at about 27" from the front. This is about 15+ inches too deep.
This a classic failure for 928 5-speed TTs, although there have been some that migrated forward, but very few.
So there seems to be a few different problems contributing to the felt vibrations of this 928.
This a classic failure for 928 5-speed TTs, although there have been some that migrated forward, but very few.
So there seems to be a few different problems contributing to the felt vibrations of this 928.
Last edited by Constantine; 09-15-2020 at 06:09 PM.