Audi 90 10 valve fuel consumption

[Huw Powell]

Check oxygen sensor first.  Simplest test is to measure its output 
voltage (the single wire at the bracket on the side of the head) at warm 
idle, it should fluctuate fairly rapidly between about 0.2 and 0.7 
volts.  It can be removed and bench-tested with a voltmeter and propane 
torch, too.

Check coolant temp sender on top of top radiator hose neck.  Resistance 
~1-2k ohms when cold (ice water/overnight cold engine), 100-250 or so 
when hot (boiling water/hot engine).  Exact specs or curve ought to be 
in the Bentley, but they are hard to find.

Check 2-3 brown wires grounded to bolt on intake manifold (under fuel 
injector lines).

A bad OXS - or malfunctioning CIS/OXS feedback loop - can easily cause 
over-rich conditions.

On 3/27/2012 11:35 PM, Rick Hayllar wrote:
> Hi all
> I have just got my 90 10 valve up and running.
> I runs smoothly and reliably but is very thirsty - something like 10
> miles to gallon.
> Almost like its leaking fuel but it is not!
> Where should I start looking
> Rick Hayllar
>
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