misfire under light load

[200q 20v]

I would say here is a partial problem under full throttle and hight rpm
and an impression of 3 or 4 cylinders misfire under WOT and 2000 rpm.


-----Original Message-----
From: Bernie Benz
Subject: Re: misfire under light load
Date: Sat, 12 Nov 2011 16:34:02 -0800

If no obvious leakage tracks on cap or rotor I would not expect a  
problem there. And no problem under heavy throttle. I’d start by  
looking at injectors, maybe one is sluggish to open.

Bernie

On Nov 12, 2011, at 3:01 PM, 200q 20v wrote:

> Fellow experts,
>
> Driving in 4th gear, 2000 rpm, increasing throttle feels like a
> misfire in several cylinders. E.g. virtually no power.
> It is not very pronounced when engine is cold.
> It appeared to start after last track event. Leaving the track I
> noticed slightly rough idle and above mentioned misfire while driving
> home.
> Changed several years old spark plugs (found the cheapest F5DPOR on  
> Amazon).
> Virtually no changes. There are no vacuum leaks (cold engine pulls
> full boost with no problems) no codes in ECU.
> Strangely enough during recent heavy rain misfires were much less  
> pronounced.
>
> If left on idle a few misfires a minute can be heard.
>
> Wires and distributor cap are about 5 years old, much less then
> average miles per year.
>
> I wonder if anyone has any ideas. I plan to look at replacing cap /  
> rotor next.
>
> Eugene.
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