Spark plug torque specs

[userbbc]

I remember when the car was at the dealer for a HPFP replacement, the techs had checked the spark plugs and noted they were loose. Had previously torqued them to 22ft-lbs per the B7 DIY.

I do remember somebody mentioning 25ft-lbs for the B8 but can't seem to find the post.

What are the correct torque specs for tightening the spark plugs?

[TCHUN003]

I'm wondering the same thing. I've always used 22ft-lbs on my B6 as well.

[the1obster]

Would like to know as well. It seems that when my spark plugs were replaced at the 35k maintenance i had a rough start up and a rougher idle. Could it be the colder spark plugs (since they changed from bosch to ngk, it went from a seven to a six, colder plugs)?

[Hankoman]

Correct torque for "spark plugs in cylinder head" is 30 Nm, and 5 Nm for "guide for ignition coil wiring to cylinder head cover". Information taken from "Maintenance Audi A4 2008 ➤ Edition 12.2010", downloaded from www.erwin.audi.com.

[userbbc]

Wondering now if they come loose. Will probably be replacing them again soon and will try and check the torque specs again a few thousand down the road to see if they loosened up by themselves.

[Hankoman]

Don't try this if you feel it is risky. But, a mechanic at an Audi dealership changing my sparkplugs on my B8 2.0T engine once told me that once the plugs starts to face resistance as you screw them in, you should go another 1/4 of a rotation. Then your done.

[userbbc]

So, retorqued the spark plugs a few thousand miles later and they had indeed come loose. Tightened them to spec and a few more thousand miles later, they remained in spec. I can't remember the exact mileage I checked the torque specs each time but in all I double checked the torque specs twice within a space of 5k miles after initial replacement.

[languiduck]

Is there a write up on the B8/A4 spark plug replacement someone could point me to?

[TCHUN003]

Check a4mods.com The write-ups are all for the B6 platform, but he Martini has great instructions with pictures and the B8 won't be much different. I pretty much learned how to do all of my DIY and maintenance from him lol

[Info@EuroCode]

erWin Torque Spec is 30nm or 22.13 lb/ft. This only applies to new plugs that have never been torqued. If the plugs are being removed and reinstalled, then we do about 26-28 lb/ft to keep them from leaking.

[userbbc]

erWin Torque Spec is 30nm or 22.13 lb/ft. This only applies to new plugs that have never been torqued. If the plugs are being removed and reinstalled, then we do about 26-28 lb/ft to keep them from leaking.

I torqued new plugs at 22lb/ft at around 35k and never touched them again for about 15k miles until the dealer stated the plugs were loose when diagnosing what ended up being a hpfp problem. The hpfp replacement together with an intake replacement and fuel mixture running rich codes led me to replace the plugs with new ones again at about 55k. Again I torqued the plugs to 22lb/ft. At or about 57k, i checked the plugs for tightness and found I could tighten the plugs about another quarter to half turn before the torque wrench clicked. A few days ago at almost 60k I checked the plugs again and found I didn't need to tighten any of them.

Essentially, it seems that the new plug installation at 22lb/ft would loosen up after a few thousand miles (at least in my case)
I did some basic torque wrench calibrations (hang a weight off the handle and multiple that weight by the length) and the wrench was fairly accurate.

Thanks for the information on increased torque specs when reinstalling. Useful to know when checking the plugs next time.

[Highlander1010]

Does anyone have a good B8 DIY write up? I cannot find one (only for the B7). I'd really like to do these myself from time to time.