<VV> 828 miles this weekend - car running lean - advice appreciated
Guus de Haan
guusdehaan at me.com
Mon Oct 5 05:07:56 EDT 2009
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
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
'65 Corsa Turbo-Charged Cvt
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