Q: Cylinder 5 has a misfire.

asked by on February 23, 2017

Today I checked my cts2 diagnostic reader and it popped the code p0305 (cylinder 5 miss fire). It doesn't idle rough or like stutter step. It has full power and when I checked the diagnostic a few hours later, it doesn't come up. I really haven't found anything online or anybody I know in person that has a clue. But I do know one of my injectors or a sensor is going bad, no matter what the air temperature is outside, if my truck goes into high idle and the coolant temperature is from specifically 65-100degrees it has a rough idle and white smoke pours out until the coolant temperature hit 100. My coolant could be 25 degrees and high idle kicks in but it doesn't rough idle until it hits 65. Thanks for your time

My car has 124879 miles.
My car has an automatic transmission.

Engine is misfiring Inspection $79.99 - $89.99 Get a Quote

Hi there. To determine if the injector is not working properly, either you can perform a cylinder cut out test on your injection system or you can swap your injector on cylinder number 5 with another cylinder and see if the code registers a misfire on the other cylinder. If the other cylinder changes or if the cylinder cut out test has not change on cylinder 5, then the injector will need to be replaced. If you move the injector and cylinder 5 still has a misfire, then there could be a burned exhaust valve that is cause a loss of compression until the valve heats up. It maybe a small amount of material removal on the valve causing the misfire. If you need further assistance with your engine misfiring, then seek out a professional, such as one from Your Mechanic, to help you.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

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

What others are asking

Timing marks on a Chrysler 300 V6 3.5 liter. Help with putting a timing belt on.

As long as the camshafts did not turn and the timing marks are the same, then there is no issue and the timing marks are lined up properly. If you need further assistance with your timing belt, then seek out...

How do I turn on and off the fog lights?

The fog lights are controlled by a large button that doubles as the headlight switch. The headlight switch is a circular switch to the left of the steering wheel. It can be rotated to turn on the headlights, but if...

grinding noise while driving straight?

A possibility is a faulty wheel bearing. Less common possibilities are interference with the brake rotor and transmission failures. A faulty wheel bearing can be diagnosed, on the road, by driving the car in such a way that you "sequentially...

I have an intermittent misfire - 2002 Pontiac Grand Prix

Hi and thanks for contacting YourMechanic. The EGR can cause a misfire if it is stuck open when the engine is cold or running at a lower speed. The EGR replaces some of the air with burnt fuel to help...

I Had a diagnostic test for Ford escort. What can I do about the Mass Air Flow sensor?

Hi there. You can remove and clean the Mass Air Flow sensor with an electrical cleaner that is non chlorinated. If the sensor is cleaned out and the light is still on, check the intake hoses from the sensor to...

bearing shaft and balance shaft

Hi there. The recommendations to replace these parts may be a sales ploy to make some money from you since the dealer has to do this piston work under warranty for you. If you have an engine issue after they...

Multiple electrical problems with car.

The symptoms you describe on your vehicle lead me to believe your vehicle may be experiencing an electrical problem with the Totally Integrated Power Module or TIPM on your truck. This module is responsible for many different components on the...

There is whirring noise and vibration coming from the front end of my car

Hello. It sounds like you have a bad front hub bearing. When the bearing fails, this will occur as the noise you are hearing is the bearings not having any grease on them. I typically start by getting the vehicle...

Car died with a low oil indication

The engine misfire codes could be an indication of why the car died. When the engine is misfiring, it can cause a very low power situation, can cause the engine to shake, and can cause the vehicle to stall out...

Related articles

P0772 OBD-II Trouble Code: Shift Solenoid E Stuck On
P0772 means that a problem in the shift solenoid was detected, usually in the form of an incorrect gear ratio due to low or dirty transmission fluid.
P0882 OBD-II Trouble Code: TCM Power Input Signal Low
P0882 means low voltage is coming from the transmission control module circuit, caused by low battery voltage or an open or short circuit.
P0254 OBD-II Trouble Code: Injection Pump Fuel Metering Control “A” High (Cam/Rotor/Injector)
The The P0254 Trouble Code indicates issues with the inject pump fuel metering control “A” high (cam/rotor/injector). What the P0254 code means When this code appears, it means that the powertrain control module has found an issue with the signal...