B8 S4 Spark Plug Change / Idle Problems - AudiForums.com

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Old 04-16-2017, 06:05 PM
1st Gear
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Join Date: Apr 2017
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Default B8 S4 Spark Plug Change / Idle Problems

Hey everyone, I'm looking for a hand.

Today I changed the spark plugs in my B8 S4. When I fired it up after the change the idle was noticeably poor.

Any thoughts as to why? I read a couple articles and watched a couple of videos. Perhaps I didn't tighten the plugs in enough?

Any thoughts are appreciated.


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Old 04-18-2017, 10:59 AM
2nd Gear
Join Date: Jul 2009
Location: Colorado
Posts: 664

If you tightened them according to specs and purchased the correct models - I would check the gap next. Improperly gapped plugs will run poorly. Especially if you have any kind of tune on the car it needs to be spot on.
After that I guess it's always possible you got a bad spark plug (never happened to me but I guess it's not impossible).

Also, make sure nothing fell into the hole (that's why you see a lot of people put paper/shop towels in the opening after removing the spark plugs so they stay "clean")
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Old 04-18-2017, 02:38 PM
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Thank you very much.
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