Poor fuel mileage after a tune up was done?

Tiny
MYRA SANDOVAL
  • MEMBER
  • 2017 HYUNDAI ELANTRA
  • 2.0L
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 46,000 MILES
Before I had a tune up, I got 32 miles a gallon highway. After the tune up I'm only getting 24 miles a gallon highway. What can the problem be?
Monday, June 26th, 2023 AT 10:46 AM

1 Reply

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,363 POSTS
It sounds like they installed the wrong spark plugs or the gap is off. Here is a guide to help you do the job correctly and instructions for your car in the images below.

https://www.2carpros.com/articles/how-to-change-spark-plugs

Spark plug:
Type ELR9IQP9+
Gap 0.8 - 0.9 mm (0.0314 - 0.0354 in.)

Check out the images (below). Please let us know if you need anything else to get the problem fixed.
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Monday, June 26th, 2023 AT 6:11 PM

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