MC2 running very lean

Tony Hoffman auditony at
Wed Oct 19 11:29:55 PDT 2011

You didn't mention the fuel filter. Has it been changed?


On Wed, Oct 19, 2011 at 11:57 AM, Dag Bøsterud
<dag.boesterud at>wrote:

> Early this summer my 1990 Audi 100 TQ Sports started to misfire when I
> first
> started it in the morning. I had to rev it at about 2500-3000 rpm for like
> 10 seconds before it fired on all cylinders. At the same time it started to
> misfire occasionally when the turbo was boosting.
> The latter problem got worse to a point where the car is now undriveable.
> It
> even misfires before the turbo kicks in.
> The spark plugs were checked, and the car runs very lean; they're white as
> snow. I've also checked all kinds of hoses,
> I can't find any leaks anywhere. I've checked voltage at the fuel pump,
> that's 13,64V. No errors on the fault memory.
> It boosts 0,85 bar of turboboost.
> All sensors, hoses, injectors, gaskets/seals, ignition parts are new, new
> spark plugs (Bosch WR6DP),
> new Bosch 040 fuel pump.
> Before the engine started to misfire I hadn't touched anything. What could
> be wrong? :/

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