Q: Truck is running rough engine light. Keep call code

asked by on

Truck running rough tune it up code keep coming up mis fire 2 and 8. Smell coming out tail pipe like. Rotten eggs on 2001 dodge ram 1500 dont. Know if A C I nd to be change and. TB nd to be clean or cat is going or fuel pump with fuel filter nd ro be change please help thanks

My car has 137798 miles.
My car has an automatic transmission.

The rotten egg smell out your tail pipe is the catalytic converter working to hard. It is doing this because raw unburned fuel is being pumped into it. This can damage it. If your Check Engine Light is flashing, this means there is a danger of the catalytic converter catching fire. So don’t drive it far.

With a tune-up you should have replaced the spark plug wires and the spark plugs. If it ran normally before you gave it a tune-up, I would first begin by checking the firing order. Even the best of us will mix up the spark plug wires from time to time. If the firing order is correct, I would suspect a broken spark plug. It is not uncommon for the porcelain to crack when we are tightening the spark plug. You should be using a spark plug socket. If you are not, you are lucky you didn’t break more.

If you have covered all that, then the next thing I would do is a compression check. If cylinders 2 and 8 have lower compression than the rest of the cylinders, you have leaking valves or piston rings.

Your A/C system, fuel pump, catalytic converter, fuel filter or throttle body won’t cause only two cylinders to misfire. It is possible you have injector problems, but this is unlikely with the rotten egg smell because this is an indication of unburned fuel being pumped into the exhaust.

If you’d like some assistance with this, consider YourMechanic, as one of our mobile experts can further diagnose your trouble codes and help you fix the problem accordingly.

Good luck!

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. Truck is running rough engine light. Keep call code

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: It will crank but will not turn on. Leaving a smell of gas

Hello, thank you for writing in. The vehicle may be having spark issues. If the spark is not strong enough to ignite all of the fuel, or does not ignite the fuel at all, the spark plugs may not be...

Q: How do I use the remote start comfort system?

The remote start comfort system allows your vehicle to set comfort settings for you when you use the remote start system. That way, when you turn on your car before you’re in it, your car is optimally set for your...

Q: Q: Engine vibration

Hello, thanks for writing in about your Volkswagen Passat. You should scan the engine computer to see if you are getting a misfire code for one of the cylinders. From what you've described you may have a defective coil or...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
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...
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...