Rough running along with DTC 16684 and 16688

[silver4444uk10]

Hello All,

On my daughter's car VW Polo (year 2000) 1.0 Engine AUC,
I have intermittent rough idling and rough running when accelerating along with the following 2 DTC codes using Vagcom

16684 Random/Multiple Cylinder Misfire detected P0300-35-10 - Intermittent
16688 Cylinder 4 P0304-35-10 Misfire Detected - Intermittent
along with an intermittent check Engine light.

So far I have interchanged number 3 and 4 spark plugs defect remains the same,
and interchanged number 3 and 4 ignition leads and again the defect remains the same.

I have also noticed that there is an intermittent sparking noise coming from the DIS Module
which seems to coincide with the rough running.

Am I right in saying that my next job should be to change the DIS Module or is there something else I should
be looking at ???

Rgds.

Silver

[alexperkins]

Check the engine earth straps

It could be the DIS module if this isn't the case

[silver4444uk10]

Hi Alexperkins,

I have just cleaned the earths and the defect is still there.
So I will order a DIS module and when I've changed it I'll post the outcome on the site.

Thanks for your advice.

Rgds.

Silver

[silver4444uk10]

Hi Alexperkins,

I replaced the Dis Module and the defect has gone.

My daughter is delighted, as is her dad !

Many thanks,

Silver

[alexperkins]

Wonderful. Thanks for letting us know

[alanjwong]

What an interesting read this has been, I have the exact same problem with mine.

[alanjwong]

Hi Alexperkins,

I replaced the Dis Module and the defect has gone.

My daughter is delighted, as is her dad !

Many thanks,

Silver

What DIS pack did you go with? genuine VW or a copy part?

[silver4444uk10]

I replaced it with a genuine VW dis module.