Misfire or buck

Tiny
JIMMIE FOX
  • MEMBER
  • 2011 MAZDA 3
  • 2.5L
  • 4 CYL
  • FWD
  • AUTOMATIC
  • 75,000 MILES
Starts fine and idles perfect in park or neutral or even idles perfect stopped in drive. But running on interstate it has a misfire.
Saturday, June 3rd, 2017 AT 5:26 AM

1 Reply

Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Scan for codes and check fuel pressure with a gauge auto parts rent it. it may be low on fuel pressure at speed causing it. also, check for a vacuum leak like a hose off/hole etc. See link.
https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator
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Saturday, June 3rd, 2017 AT 6:05 AM

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