<VV> 828 miles this weekend - car running lean - advice appreciated

Guus de Haan guusdehaan at mac.com
Mon Oct 5 09:29:38 EDT 2009

Little correction. It is LEAN but the correct value on the scale is  
16, not the 11 I mentioned earlier!

Guus de Haan
The Netherlands
'65 Corsa Turbo-Charged Cvt

Op 5 okt 2009, om 11:07 heeft Guus de Haan het volgende geschreven:

> Yesterday evening we came back from our trip to Germany with the
> Corsa. Total mileage was 828 and the car ran very well. Most of the
> time we drove 75 mph (indicated on the GPS system) on the autobahn
> with a short burst to 94 mph to see if the turbo still works. Well it
> did and I was again surprised how much more fluent extra power is
> there when the turbo kicks in. This was nowhere it's maximum but I had
> to stop because the warning light and the buzzer came on. The fan belt
> was on so I just slowed down for a few miles and took the next exit to
> park and let it cool down a bit. After that everything was back to
> normal.
> What causes the temperature to go up too fast is a to lean mixture.
> The car knocks a bit when accelerating but not when maintaining a
> steady pace. I also noticed that when the turbo kicks in the knocking
> disappears. On our trip to Germany it was almost on lambda 14,7 all
> the time (mine has a Safe Guard system with sensor in the exhaust).
> But on the way back home it started running leaner and leaner (near
> 11). Does anyone have an explanation what could cause this? I could
> change the YH to a size bigger jet but would like to know first what
> could cause this change this during the trip.
> Fuel consumption was 19,3 mpg over the total trip. Since I drive the
> car without using the performance most of the time I run it on
> regular. I don't mind putting higher octane in, but since the turbo's
> have such a low compression they don't really use it most of the time,
> do they? And I always check the Safe Guard indicator and listen to the
> engine when pushing it.
> Great weather, great people, great car, what more do you want!
> Guus de Haan
> The Netherlands
> '65 Corsa Turbo-Charged Cvt
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