Fiero GT timing issues (Page 2/2)
Xenoblast MAR 25, 01:50 PM
I should have said this yesterday but Im gonna do it later today, I have to wait until my friends done with school so that he can help me. I will keep you all updated.
PatrickTRoof MAR 25, 02:48 PM

quote
Originally posted by css9450:

I forget who it was, so maybe it was Patrick? Someone here on the forum had a car where the outer ring would continue to spin for some period of time (a few seconds maybe) after the engine was shut off. Now THAT'S a slipped ring!



I'm Patrick and that happened to me! Although I don't recall posting about it on here. It was pretty strange. An odd vibration while the engine was running, and then a Z-Z-Z-Z-Z-Z noise as the ring continued to spin after shutting off the engine.

Pertaining to the original post, here is a good tutorial on finding TRUE top dead center in any engine. If you verify that it has indeed slipped, it's a good idea to replace it, because as mentioned, it will continue to slip, and eventually come apart as happened to me.

https://www.youtube.com/watch?v=2Yh2ZpKHkq4
Patrick MAR 25, 02:53 PM

quote
Originally posted by PatrickTRoof:

I'm Patrick and that happened to me!



...

Xenoblast MAR 25, 10:16 PM

quote
Originally posted by Patrick:

Report back with your results.





I timed it, with 10 degrees on both 1 & 4. On the guides they tell you the average of both cylinders should equal out to 10 so I assume that works, but let me know if otherwise.

First thing I noticed is that the car idled in diagnostics mode.

There suprisingly was no real power gains with it normally running, but it does idle a lot smoother.

The timing before was so bad that at idle running normally, the ignition timing mark was at around 2 degrees advanced.

[This message has been edited by Xenoblast (edited 03-25-2021).]

Patrick MAR 29, 09:49 PM

Thanks for reporting in. It's good to hear back when an issue is positively resolved.

I happened to come across the following image in an old thread. This is the eventual outcome when the harmonic balancer hub and outer ring decide to go their separate ways!