What's up ladies and gents,
I've run into an issue. I used to get around 20 mpg on streets and 26-28 on long highway commutes.
Now I get 15-17 mpg on streets and 22-23 on highway. My driving habits haven't changed so why such a big drop in MPG?
All I've done since this happened was change the the upper chain guides and spark plugs since I had the intake off.
I checked all my vaccum lines. No leaks.
I'm using NGK spark plugs I bought off ecs tuning. Which stated "OEM replacement". I did notice the original ones I took out had the audi logo instead of "NGK" on the side of the plug.
Intake gasket air leak? Valve cover gasket leak? I see no oil leaks from the valve cover so I really doubt it. Anybody have any experience with an issue like this?
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