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Old 11-06-2019, 12:17 PM   #1
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Valve Spring Recall Affecting Fuel Economy?

Ever since I got my recall work done, I feel like my average mpg went down. Besides the recall, I had them change out the spark plugs and TOB, nothing else. Has anyone else feel their fuel economy taken a slight hit of a few MPG less?
Is this something that needs to be broken in for the mpg to go back up to where it was?

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Old 11-06-2019, 12:34 PM   #2
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Are you going by the car computer only or doing your own calculations?
How long has it been since the recall?
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Old 11-06-2019, 12:35 PM   #3
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If you have done nothing else to the engine and are using stock tune it will take a little while for the computer to re learn.
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Old 11-06-2019, 12:36 PM   #4
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Are you going by the car computer only or doing your own calculations?
How long has it been since the recall?
Going by the computer average mpg. I usually keep my eye on the fluctuating mpg while I'm driving and I noticed this change. It has been about 300miles since I got it back.

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Old 11-06-2019, 12:37 PM   #5
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If you have done nothing else to the engine and are using stock tune it will take a little while for the computer to re learn.
I have a ots tune before the recall. Do you know if they clear the tune as part of the recall?

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Old 11-06-2019, 12:37 PM   #6
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Quote:
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Going by the computer average mpg. I usually keep my eye on the fluctuating mpg while I'm driving and I noticed this change. It has been about 300miles since I got it back.

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I think it's too soon to tell, you've only gone 1 tank since the recall. Keep driving and monitoring.
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Old 11-06-2019, 12:44 PM   #7
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Checked my records for the two months before and two months after.

2 months before was 3,836 miles @32.60MPG
2 months after was 3,192 miles @32.64MPG

That included changing out the plugs at 136,000 miles for the first time.
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Old 11-06-2019, 12:46 PM   #8
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The weather has got colder since you had the recall done. You will take a small hit in MPG just from that. There should be no impact on MPG from the work they did.
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Old 11-06-2019, 01:08 PM   #9
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When I replaced my battery last spring, the in dash average display went down drastically.
It's finally got back to the pretty solid 33.4 I had before only last month.

You're most likely getting the same mileage.
The computer takes quite a while to creep back up with that 0 still in the data set.
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Old 11-06-2019, 01:21 PM   #10
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When I replaced my battery last spring, the in dash average display went down drastically.
It's finally got back to the pretty solid 33.4 I had before only last month.

You're most likely getting the same mileage.
The computer takes quite a while to creep back up with that 0 still in the data set.
I did noticed that I had to do the EULA agreement all over again on the head unit when I got it back. Maybe they disconnected the battery for a while doing the recall?

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Old 11-06-2019, 01:31 PM   #11
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You can always reset your MPG data by holding the button down.
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Old 11-06-2019, 01:38 PM   #12
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My gas mileage dropped significantly because I started driving the car as if it were new to me - hammering every corner I could find as I had just been re-united with an old friend. Are you certain also that you're not driving differently than before?
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Old 11-06-2019, 01:59 PM   #13
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My gas mileage dropped significantly because I started driving the car as if it were new to me - hammering every corner I could find as I had just been re-united with an old friend. Are you certain also that you're not driving differently than before?
Haha no I was told not to hammer it for the first thousand miles so I kept it under 4k rpm. It's been hard not to....

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Old 11-06-2019, 02:00 PM   #14
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You can always reset your MPG data by holding the button down.
I think I will reset it and see how I fare. Haven't reset since I got it back from the recall.

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