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Old 09-23-2017, 09:37 PM   #1
dcpppf
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New fuel filter and spark plugs = lower MPGs?

I replaced my fuel filter and spark plugs a few weeks back and have noticed quite the drop in fuel mileage. ~ 40-50 miles per tank.

I believe the new fuel filter went from 6.4 bar to 6.6 and my new plugs were .028" gapped (APR stage 2 recommendation).

Any reason why such a drastic change in fuel mileage??
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Old 09-23-2017, 09:50 PM   #2
MLue1
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Originally Posted by dcpppf View Post
I replaced my fuel filter and spark plugs a few weeks back and have noticed quite the drop in fuel mileage. ~ 40-50 miles per tank.

I believe the new fuel filter went from 6.4 bar to 6.6 and my new plugs were .028" gapped (APR stage 2 recommendation).

Any reason why such a drastic change in fuel mileage??
You need to reset the long and short term fuel trim by reseting the ECU, as the car is still compensating for worn parts.
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Old 09-25-2017, 07:40 AM   #3
dcpppf
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Hmm, noted. I'll disconnect the battery for a bit tonight when I get home.

Any way to reset the fuel trims with VCDS? Sounds like just clearing fault codes will, but not sure.
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2012 CSG GTI MT Autobahn Timeline: 20% Tint // Clear Bra // APR Stage 1 Tune // DG Short Shifter // Verdict Shifter Bushings // 10" Uberstealth Sub Setup // Soundaktor Delete // BFI Dogbone Insert // APR 3" Downpipe & Tune // ECS Auto Hatch Pop // DEPO Black Cherry Tails // R8 Packs // Tinted Side Markers // Sachs SRE Clutch + PP // DV+ // Shortened Shifter Shaft // deAutokey LEDs // Polar FIS Adv// Euro Headlight Switch // Dash Cubby // Unitronic CAI (replaced Carbonio) // Unitronic Catback
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Old 09-25-2017, 06:24 PM   #4
MLue1
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Hmm, noted. I'll disconnect the battery for a bit tonight when I get home.

Any way to reset the fuel trims with VCDS? Sounds like just clearing fault codes will, but not sure.
Yup
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Old 09-25-2017, 09:13 PM   #5
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Hmm, noted. I'll disconnect the battery for a bit tonight when I get home.

Any way to reset the fuel trims with VCDS? Sounds like just clearing fault codes will, but not sure.
you probably did it already but clearing VCDS will reset LTFT AND STFT.
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Old 09-26-2017, 07:49 AM   #6
dcpppf
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Didn't seem to have much of an effect on this mornings commute. But will give it a tank or two before trying something else! thanks for the help everyone.
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2012 CSG GTI MT Autobahn Timeline: 20% Tint // Clear Bra // APR Stage 1 Tune // DG Short Shifter // Verdict Shifter Bushings // 10" Uberstealth Sub Setup // Soundaktor Delete // BFI Dogbone Insert // APR 3" Downpipe & Tune // ECS Auto Hatch Pop // DEPO Black Cherry Tails // R8 Packs // Tinted Side Markers // Sachs SRE Clutch + PP // DV+ // Shortened Shifter Shaft // deAutokey LEDs // Polar FIS Adv// Euro Headlight Switch // Dash Cubby // Unitronic CAI (replaced Carbonio) // Unitronic Catback
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