Q: Dodge ram misfires only when I do a cold start?

asked by on

When I first start up my engine in the morning I can notice the misfire and the engine light for cylinder 8 will come on. But after it warms up the truck runs smooth as can be and once it's warmed up if I turn the truck off and back on the engine light will turn off. I've done a compression test and they are all good and I replaced #8 ignition coil. What else could be the problem? I also know I'm using the wrong brand spark plugs... could that be causing it? Please don't recommend a misfire inspection because I've had you guys do that before and the mechanic was stumped.

My car has 124100 miles.
My car has an automatic transmission.

Hello, As you may know, there are a number of things that can cause a misfire ranging from faulty ignition parts to changes in air/fuel mixture, fuel pressure, timing an the list goes on. If you do know you have the incorrect spark plugs in the motor, I would start with changing these first as this can absolutely cause the motor to misfire depending on the heat range and resistance of the plug relative to what the factory calls for. This may be more noticeable when the motor is cold as the plug may be struggling to provide the correct flash pattern to ignite the fuel. Once the motor is warm, there is additional heat in the combustion chamber which may reduce the impact of the incorrect plug.

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. Dodge ram misfires only when I do a cold start?

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: Crank but want start. Key stays in start position and continues to try and start. What could this be?

It sounds like you may have two different problems. The first is key sticks in start position can be a defective ignition switch internal spring or the key lock linkage is binding. You may need to remove electrical ignition switch...

Q: My car barely shifts gears, so hard to shift , now won't go into park!!

Hi there. Your car has a safety switch on the transmission that will only allow the vehicle to start in park gear with an automatic transmission. If you're having problems with the shifter, it's quite possible that either the shifting...

Q: Jerking while shifting from second gear into third gear

This issue could be something as simple as a reprogramming of the transmission computer, to a broken motor mount (although the jerking would probably be felt in all gear ranges), to possibly a transmission malfunction. Unfortunately, the transmission module reprogramming...

Related articles

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...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...
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.