• Mustang Forums
  • 2015 - 2023 (S550) Mustang -General/Talk

2018 EcoBoost P0303 Cylinder 3 Misfire

  • Thread starter Thread starter nick_obryan
  • Start date Start date Aug 30, 2018

nick_obryan

New Member
Aug 27, 2018
3
0
1
Pompano Beach, FL
Aug 30, 2018
#1
  • Aug 30, 2018
  • #1
Car has 11k miles. JMS Boostmax Tune, CAI, and cold side bov. Car misfires at start up until given a little bit of throttle, then the idle goes normal. and every so often on start ups, clouds of white smoke. only lasts for like 20 seconds. Oil changed every 4k miles. most recent being like 3k miles ago. Usually check oil quite often. But when car started acting up. i checked it, and was very very low on the dip stick, and was black. Anyone have any idea what might have caused this and at such low mileage? What could cause the engine to burn this much oil ? and would it correlate at all to a cylinder misfire? Thanks
 
You must log in or register to reply here.

Similar threads

M
Help! 2003 GT misfire when hot
  • Modular03
  • Feb 10, 2026
  • SN95 4.6L Mustang Tech
Replies
4
Views
506
SN95 4.6L Mustang Tech Feb 13, 2026
Mustang5L5
Engine Random Misfire at idle.
  • Gulftown980x
  • Jul 29, 2026
  • SN95 4.6L Mustang Tech
Replies
11
Views
457
SN95 4.6L Mustang Tech Jul 31, 2026
squeak93
B
Engine Another no start after washing engine bay
  • bruno
  • Apr 26, 2026
  • Fox 5.0 Mustang Tech
  • 2
Replies
24
Views
900
Fox 5.0 Mustang Tech May 7, 2026
AeroCoupe
A
Rough idle - cylinder 1 and 6 misfire HELP
  • austindavies935
  • Jul 24, 2025
  • SN95 4.6L Mustang Tech
Replies
12
Views
826
SN95 4.6L Mustang Tech Jul 24, 2025
gkomo
D
Foxbody Misfire 5.0 Swap
  • DPORTER0729
  • May 2, 2025
  • Fox 5.0 Mustang Tech
Replies
7
Views
703
Fox 5.0 Mustang Tech Jul 13, 2025
90sickfox
Share:
Bluesky Email Share Link
  • Mustang Forums
  • 2015 - 2023 (S550) Mustang -General/Talk
Menu
Log in

Register

  • Forums
  • What's new
  • Media
  • Resources
  • Contact
  • Sponsor
X

Privacy & Transparency

We use cookies and similar technologies for the following purposes:

  • Personalized ads and content
  • Content measurement and audience insights

Do you accept cookies and these technologies?

X

Privacy & Transparency

We use cookies and similar technologies for the following purposes:

  • Personalized ads and content
  • Content measurement and audience insights

Do you accept cookies and these technologies?