Stumble

[Huw Powell]

The ECU can store codes without turning on the MIL.  For instance,a 
single misfire will be "reported", but won't trigger the MIL.

On 11/3/2011 4:16 PM, Hayes Myers wrote:
> I mentioned coils to Dan...but you would normally see the CEL so might
> not be the case....could be that over time the failure is more
> noticeable and the coils then could throw the CEL?
>
> not sure,
> Hayes
>
> On Thu, Nov 3, 2011 at 3:50 PM, Huw Powell <audi at humanspeakers.com
> <mailto:audi at humanspeakers.com>> wrote:
>
>
>
>     On 11/3/2011 3:17 PM, Dan DiBiase wrote:
>
>         I've noticed a slight stumble during acceleration in my car over
>         the past week or so. Basically, in most gears, when the car is
>         warmed up, there is a slight hesitation or stumble while
>         accelerating - it always occurs around 2,000 - 2,300 rpm,
>         regardless of
>         which gear I am in. It feels like an interruption in the engine
>         power, or a hesitation. No CELs have come on, and the TB was
>         replaced
>         at 75k miles (currently have 109k). Any thoughts on what could
>         cause this stumble?
>
>
>     I don't really have any ideas, but you should have someone check to
>     see if there any "history codes" stored in the ECU.
>
>     Huw
>
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