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sprinkles08
sprinkles08, ASE Certified Technician
Category: Ford
Satisfied Customers: 22301
Experience:  ASE Master and Advanced level certified. Factory trained with 15 years dealership experience
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Started witput in stopleakh a reoccuring p303 seta only at

Customer Question

started witput in stopleakh a reoccuring p303 seta only at idle changing out coil module no change last nite overheated on freeway got to water refilled rad engine running no codes for 15 miles 303 when at idle temp normal all way home. today put in stop leak ran engine little or no temp 10 min running then wam temp gage pegged high and 1299 code sets
Submitted: 1 year ago.
Category: Ford
Expert:  sprinkles08 replied 1 year ago.

Hello and welcome to JustAnswer!

There are many things that will cause a misfire including fuel injectors, ignition system and valvetrain issues, but I'm assuming you're losing coolant and don't know where it's going. If you don't see an external leak then it may be burning in the engine and related to the misfiring.

Are you adding stop leak because you're using coolant but don't see an external leak?