Rpms are bobbing

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Jun 15, 2012 | 12:19 AM

fourringking

Thread Starter

1st Gear

Joined: Jan 2012

Posts: 128

Rpms are bobbing

When I am going about a steady 30 mph the rpms in my B5 S4 go up and down, back and forth until I start to coast or press the throttle more. What could it be? Vacuum leak?

Thanks for any input you may have!

Jun 15, 2012 | 04:20 AM

FonzoB5S4

2nd Gear

Joined: May 2008

Posts: 951

From: Los Angeles, Ca

sounds more like a boost leak, but you should change out all your vacuum lines just to be on the safe side. pick up a couple feet at autozone.

Jun 17, 2012 | 08:43 PM

fourringking

Thread Starter

1st Gear

Joined: Jan 2012

Posts: 128

Are there a lot of vacuum lines? Are they hard to get to?

Jun 17, 2012 | 11:45 PM

FonzoB5S4

2nd Gear

Joined: May 2008

Posts: 951

From: Los Angeles, Ca

not really. its all the rubber lines that connect to the dv's for the most part. very easy.

Jun 22, 2012 | 05:22 PM

Boostfreak94

1st Gear

Joined: May 2012

Posts: 48

From: Spotsylvania, Virginia

Hey Fonzo, Mine does the same thing and I just replaced all my lines trying to figure out why I had no power. I figured it was the computer doing whatever it pleases. What else could it be?