Good morning,Advice from senior members

Stan.Shaw@Excell.Net;6232 wrote: Wow, the thought just occurred to me, I wonder if any of my car symptoms could be related to a slipping timing ring. My first thought is that timing would show up as wrong, since a slipped timing ring would cause the plug to fire when the piston was in the wrong position....

But then I recall that the car has run well for some periods of time, which could only be true if the timing ring was in the correct position, so it would need to be moving back and forth from good to bad positions. I will check the timing anyways...

I would think that an issue with the timing ring would be highly unlikely in your situation because of the intermittent running issues. What kind of shape is the exhaust in on your car? I had a bad exhaust leak before the o2 on my car that led to strange intermittent running issues for awhile.

Concerning timing rings, I don't think the earlier 928s have one. Or maybe I've just never noticed it. :confused:

Non known issues with the exhaust, when I review more, I will update my thread.

I believe I have the flywheel for my '80 on the floor and it is toothless (no ring). It also had a distributor you could turn to set timing

Stan.Shaw@Excell.Net;6232 wrote: I actually probably should have said "timing ring" as I think it is better known as that. The timing ring is only pressure fit to the flywheel as I recall, and can be removed if needed. It just wouldn't seem terribly likely that it would slip.

I had my '90 GT converted from the single disc clutch to the older, and stronger, dual disc clutch. Swapping the timing rings from an S4 automatic to the S flywheel was part of the process, so I do know they can be changed.

As I recall the process of swapping timing rings is usually performed by heat and cold.

Wow, the thought just occurred to me, I wonder if any of my car symptoms could be related to a slipping timing ring. My first thought is that timing would show up as wrong, since a slipped timing ring would cause the plug to fire when the piston was in the wrong position....

Check, the ring had 2 experts change every electronic part on my car. It would run good and then run like crap. Brought it to a guy in New Orleans he went right to the fly wheel and showed me it was slipping. It is pressed on he put a tack on it but told we it might not hold because they are two different kinds of metal. He had my car running in less than a day. The other people chased there tail for a year and cost me $2000 in parts,

928mac;6212 wrote: A leak down test and or a compression test
ILL see if I can find a step by step link.

leak down link
en.wikipedia.org/wiki/Leak-down_tester

www.motorcycleproject.com/motorcycle/text/leakdown.html

I have a compression tester, thanks for the procedure, now I just have to get off of my behind and do it.

denhamfly;6264 wrote: It is pressed on he put a tack on it but told we it might not hold because they are two different kinds of metal. He had my car running in less than a day. The other people chased there tail for a year and cost me $2000 in parts,

Did he just drop the clutch cover to find this? Could the timing ring be rotated by hand without the flywheel moving? If so, I think this is what I will look at next. My problems started 3+ years ago, after having a number of projects done to ensure it was a reliable daily driver (ironic eh?), the clutch conversion was one of those projects.