help! i think i broke it

[Alan Pritchard]

Sounds similar to my theory. I have run these engines with the timing belt a
few teeth off before with no real effect, apart from the "power band" being
moved around. Although I always re-did the static timing. My theory is the
ignition timing has gone way out, so I plan to check that with a strobe very
shortly!!

Best Regards,

Alan Pritchard,
Mechanical design engineer,
Network administrator.

Seaeye Marine LTD.
+44 (0)1329 289000
www.Seaeye.com

 -----Original Message-----
From: 	Doyt W. Echelberger [mailto:Doyt at buckeye-express.com] 
Sent:	25 February 2004 11:26
To:	Alan Pritchard
Cc:	quattro at audifans.com
Subject:	Re: help! i think i broke it

Same thing happened to one of my cars about 5 years ago(1986 4000csq.) Very 
disturbing.

I messed with everything under the hood trying to get it to return to
normal.

I finally got the bucking to mitigate but not totally go away by changing 
the spark plug gap to 45/1000.  The next week, I discovered that I could 
get the bucking to clear up by changing the spark advance about 2 degrees 
outside the book specifications.

I don't recall if it was clockwise or counterclockwise.

After the spark adjustment, I regapped the plugs to normal and the bucking 
stayed gone.


Doyt


 >>>>>>>>>>>>>>>>>>
At 08:41 AM 2/25/2004 +0000, you wrote:
>Ok, I was out last night in my 90q (NG engine) messing around on a rainy
>evening, so I thought I'd try some launches. All was good, but on the 3rd
>attempt of I went then the car proceeded to buck terribly until it stalled.
>It took me a few minutes to get it restarted, but when it did it sounded ok
>and revved as per usual. But pulling away entering 1500-2000 it would
>proceed to buck real bad, same for second, although 3rd and up seemed less
>noticeable. To drive through these areas when pulling away I actually have
>to slip the clutch.
>Any thoughts on this? I have thought through as best I can and can only
>think of a mechanical problem relating to the engine.  What is the likely
>hood of a t belt skip in these conditions? And would it manifest itself in
>this form?
>Many thanks.
>
>Best Regards,
>
>Alan Pritchard,
>Mechanical design engineer,
>Network administrator.
>
>Seaeye Marine LTD.
>+44 (0)1329 289000
>www.Seaeye.com