Skip the auto shop - Our mechanics make house calls

Q: Misfire on cylinder #1

asked by on

Hi there. I just got a Dodge Ram 1500 5.7 hemi from 2011, like a week ago. A few days ago I went to snoqualmie and when I wanted to get on freeway I pushed it a lil hard and the check engine light came on and flashing and then went off, felt that I lost some power too. On the way home same problem happened when I was trying to passed another vehicle. Since then when I try to push it harder, I mean the rpm goes over 4000, the check engine light comes on and flashing and runs rough and car feels like it has no power. The code that appeared on the scaner was p0301 which said a misfire on cylinder #1. I changed the spurs plugs and put a new coil from oreily and still misfire on cylinder #1. Any suggestions about this issue? Thank you

My car has 130000 miles.
My car has an automatic transmission.

Hello. A flashing check engine light is an indicator that the computer has detected conditions that are harmful to the vehicle’s emission system components. Continuing to drive with a flashing check engine light can result in damage to emissions system, specifically the vehicle’s catalytic converters. There are cases where the computer will even reduce power output in order to protect the engine and components, this may be the cause of your noticeable loss in power and performance when the light is on If the light stops flashing after a brief period that is a good sign that the engine is only having the issue under heavy loads, and is probably related to the cylinder 1 misfire. A cylinder specific misfire can be caused by a variety of issues. If you have already the cylinder 1 coil and spark plug then the next thing I would look at is the injector. If the cylinder 1 injector malfunctions or gets clogged it may not be able to provide the correct amount of fuel, resulting in a misfire. A vacuum leak can also cause a misfire if a vacuum hose or intake gasket allow unmetered air into the engine. I would recommend having a professional technician, such as one from YourMechanic, come to your location to diagnose the cause of your cylinder specific misfire.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

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: Brake pedal going straight to the floor

Hello. The brake pedal going to the floor is a common symptom of a faulty master cylinder. The master cylinder will usually fail due to an internal or an external leak. In your case I believe the leak is internal...

Q: Lost car remote

Hi and thanks for contacting YourMechanic. Yes you can get another remote and program it to match your vehicle, but make sure that the remote is programmed to the VIN of the vehicle if you tend to get it from...

Q: cylinder 4 misfire

Hello there, many common faults will cause a cylinder 4 misfire with the 2006 Nissan Altima. The most likely faults are the spark plugs, wires, coil, fuel injector, vacuum leak, or low compression in the #4 Cylinder. With a misfire...

Related articles

How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.