Help running problem on tick over and under boost.

[slim100s4]

Hi everyone I have an Audi s6 and it has acquired a fault. On tick over its realy lumpy revs are up and down. Also when Runing when you give it a boot full its hesitant but in a very aggressive way as if the boost is blowing the spark out. Any suggestions or advice would be great.

Cheers slim

[Pirvu Eugen]

clean the maf plug...

[UrS4boy]

Hi everyone I have an Audi s6 and it has acquired a fault. On tick over its realy lumpy revs are up and down. Also when Runing when you give it a boot full its hesitant but in a very aggressive way as if the boost is blowing the spark out. Any suggestions or advice would be great. Cheers slim

Umm...The AANs in the UrS4 and UrS6 are notorious for loosening their sparkplugs and blowing the plug out of the head. So start by checking your sparkplugs:

http://forums.quattroworld.com/s4s6/msgs/20991.phtml

Do that and then come back with an update and we will have more answers (if you need them).

[slim100s4]

Hi Urs4boy i have checked, and all the plugs are in secure so no problem there had the plugs in for about two years NGK i think. Is it worth changing if so witch ones do you suggest.

Cheers Slim

[UrS4boy]

Hi Urs4boy i have checked, and all the plugs are in secure so no problem there had the plugs in for about two years NGK i think. Is it worth changing if so witch ones do you suggest. Cheers Slim

In that case, check your MAF connector (causes strange things when all the pins aren't contacting their harness pairs properly).

MAF info: http://forums.quattroworld.com/s4s6/msgs/20442.phtml

If that doesn't cure the issue, it is very likely one of the POSs or one of the coils. Try this diagnostic:

POS/coil failure diagnostic: http://forums.quattroworld.com/s4s6/msgs/153152.phtml

Try those and then come back if you need more help.

[slim100s4]

Cheers will have a look tomorrow.

[psiconauta911]

Hi, I had the same problrm I think, It only happens with the buterfly fully closed or fully open like in tick over or full throtlle, if that´s the case in your S6 as it was in my S2 it´s due to dirty contacts in the sensor of the buterfly (I don´t remember the name) that only reads closed or open buterfly, cleaned the contacts with proper electrical cleaning spray and problem solved, no more irregular tickover or violent cuts on full throtlle!

Hope it helps, just some cleaning spray and cheap fix!

[newsh]

Sounds like a boost leak to me, or maf plug as suggested.

I suggest pressure testing the inlet tract.

[newsh]

This would be the TPS (throttle position sensor)

Hi, I had the same problrm I think, It only happens with the buterfly fully closed or fully open like in tick over or full throtlle, if that´s the case in your S6 as it was in my S2 it´s due to dirty contacts in the sensor of the buterfly (I don´t remember the name) that only reads closed or open buterfly, cleaned the contacts with proper electrical cleaning spray and problem solved, no more irregular tickover or violent cuts on full throtlle!

Hope it helps, just some cleaning spray and cheap fix!

[newsh]

Read this

http://www.s2forum.com/forum/showthread.php?t=24544&highlight=maf+connector

[UrS4boy]

G69 / F60 Throttle valve position potentiometer /idle switch information

Hi, I had the same problrm I think, It only happens with the buterfly fully closed or fully open like in tick over or full throtlle, if that´s the case in your S6 as it was in my S2 it´s due to dirty contacts in the sensor of the buterfly (I don´t remember the name) that only reads closed or open buterfly, cleaned the contacts with proper electrical cleaning spray and problem solved, no more irregular tickover or violent cuts on full throtlle!

Have a look at this G69 / F60 Throttle valve position potentiometer /idle switch information:

http://forums.quattroworld.com/s4s6/msgs/20405.phtml