Q: I have a code P1399 random misfire

asked by on

I have a misfire , especially on cold mornings The misfire is worst it gets better when the engine warms up tho . But I'll be driving on the highway and I can feel the random misfire, that aren't so bad but I can feel them .. and it gives a code p1399 . Ive changed the spark plugs, wires , and a 02 sensor . What else do I do? Or replaces?

My car has 158984 miles.
My car has a manual transmission.

Hello. A random misfire can be caused by many different things such as dirty fuel injectors, a weak fuel pump, a bad fuel pressure regulator, fouled spark plugs or wires, a failing ignition coil or a vacuum leak. To get a more precise diagnosis, I would recommend having a certified professional, like one from YourMechanic, inspect the misfiring problem firsthand so that this can be corrected properly.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. I have a code P1399 random misfire

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: My truck keeps giving me the cylinder #8 misfire code

Hello. A continuing misfire on #8 suggests a bad plug wire, a bad spark plug, or possibly oil leaking down onto the #8 plug, shorting it out. Also, if one plug wire is bad, replace them all. Given your mileage,...

Q: OBD code P1399

On Honda vehicles the OBD code p1399 indicates that there is a random misfire occurring in the engine. In most cases a valve adjustment will correct this issue, however a blocked passage in the EGR (Exhaust Gas Recirculation) system can...

Q: 1999 BMW 323i wont go in reverse it will drive but just not back up. Sometimes when run awhile it tries to go back when put in rev

The first order of business will be to read the stored codes in the transmission controller. A generic scan tool like the use at the auto parts stores and tire shops will not do the trick in this case. It...

Related articles

P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...