Problems with misfire during acceleration. Caused by air in the diesel fuelsyst?

[Kneale Brownson]

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Have you had the injectors checked for proper operation?  Could your "air
bubbles" be water?

At 08:28 AM 04/29/2002 +0200, Glenn Skog wrote:

>Hei out there!
>
>I have a problem with my A6, 2,5 TDI, 1995. It has runned about 187 000 km.
>
> From time to time, during acceleration when the engine is running about 2500
>- 3500 rpm the engine starts to "spit back/misfire". If I stop the car and
>take the engine up to 3-4000 rpm. with the gear in neutral everyting looks
>normal.
>
>In the beginning I thaught it could be something wrong with the
>dieselfilter. Two filters and 25 000 km later, this still happends from time
>to time. I have checked the used filters and they look ok, witout any dirt
>inside. I also use original audi filters. I have inspected the fuel tank but
>it was also quite clean inside.
>
>Once when I stopped the car and looked at the engine just after one of this
>spit back/misfire episodes and the engine was ideling I think I could see a
>very small air bubble in the lucid hose bringing fuel from the filter to the
>dieselpump. Maybe I have a problem because the system is taking in air
>somewhere? Anyway it`s a litle strange because it dont happend during every
>acceleration. And it`s no leaks to see from the fuelsystem.
>
>Does anyone now something about problems like this? And if it is a "air
>problem" do anyone have a suggestion about were I should start look for it?
>
>Glenn
>
>
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