Date: Wed, 12 Jun 2002 16:35:30 -0700
Reply-To: Keith Hughes <keithahughes@QWEST.NET>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: Keith Hughes <keithahughes@QWEST.NET>
Subject: Re: Tiico: stuttering when i step on the gas
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Sounds like timing to me. When mine was set about 4°BTDC
(distributor had been pulled to spin the oil pump to find the
leaking oil galley plug), it fell on its face at low rpms,
especially when shifting. Above 3K or so, the ECU advanced the
timing enough that it would run marginally OK. If you don't have an
timing light with advance (which I didn't till this saga started)
they're fairly easy to time by ear, running regular gas, by
advancing the timing until you *just* get pinging on low rpm
acceleration (not full throttle - that richens the mixture full
bore, and eliminates a lot of the pinging). Then back it off until
the pinging just stops. I can consistently get mine set at 7-9°BTDC
this way.
Otherwise, an Actron light with advance is $69.95 at Autozone. I've
also found that holding the idle at 1500rpm manually acts pretty
much the same as using the VagCom to set the timing.
Keith Hughes
'86 Westy Tiico-Gas-guzzler "Marvin"
Matthew Pollard wrote:
>
> More TiiCo stuff for you folks:
> patient- syncro westy w/ a tiico engine. low miles. a2 fuel rail. timing
> at 6 degrees, CO at 128.
>
> symptoms: stuttering. When running 87 octane w/ the oxygen sensor
> connected it runs like crap. Stutters if i accelerate too fast. Above
> about 3.8K it is fine though. If i remove the oxygen sensor it runs
> better, but still stutters when i accelerate too much. With premium gas it
> is much worse- the bus is not even really drivable! This was happening
> before and after the fuel rail conversion from 'stock' to an a2 rail. The
> oxygen sensor was old from the transplant w/ unknown miles on it! Three
> wire jobbie too.
>
> Prescription? I can log the oxygen sensor data and look at it, but don't
> always have a laptop to mess with (it's my wife's, what can i say?). Do we
> suspect my timing is still off, or something else? BTW i am getting NO
> knocks at all. Should i lean the mixture to say 100 instead of 128? More
> stuttering w/ premium gas tells me the timing is still way off or my
> mixture is way too rich. I never sniffed the tailpipe to measure the CO
> though.
>
> Suggestions appreciated.
> Thanks
> Matthew
> 86 syncro westy tiico
>
> Matthew Pollard "Racing with the wind and flirting with death
> Dept. Of Chemistry So have a cup of coffee and catch your breath"
> University of Idaho
> www.uidaho.edu/~poll7356
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