Skip the auto shop - Our mechanics make house calls

Q: Idles rough and strong rotten odor coming from exhaust.

asked by on

recently replaced distributor cap and rotor, replaced ignition control module, MAP Sensor, 0xygen Sensor, new fuel pump and filter, Air filter, new egr valve, spark plugs... could ignition timing be off? was running good then just started running like crap, still starts right now.

My car has 155600 miles.
My car has a manual transmission.

This may be a sign of a clogged catalytic converter. As you may already know, the catalytic converter converts toxic exhaust gases into less harmful pollutants that are suitable to be expelled into the atmosphere. When this is clogged, this causes these gases to be backed up into the exhaust system not allowing the engine to breathe properly (think of a backed up sink). When this happens, the engine is forced to work much harder to expel these gases. This often results in the engine bogging down, hesitating, shaking and causing very poor fuel economy. This should also cause a check engine light to come on as the O2 sensors should be reading the incorrect amounts of oxygen in the exhaust gases if this is your problem. I would recommend having an expert from YourMechanic come to your location to diagnose and replace your catalytic converter.

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
  1. Home
  2. Questions
  3. Idles rough and strong rotten odor coming from exhaust.

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: Bubbling battery

Hi, thanks for your question. This may be likely related to the voltage regulator. This is a unit that regulates the charging of the battery by the alternator. When this is not working properly, it can undercharge or overcharge (this...

Q: CE Light came on , got it checked and it said PO420. Couple of day later went off and has not come back on. 2011 Jeep Compass

Hi there - yes, it is possible the catalytic converter has lost it's ability to burn residual fuel. This could be due to an engine condition that has clogged the catalyst, or a failing oxygen sensor that is not adequately...

Q: How do I use the bluetooth feature in the stereo?

The Bluetooth functionality available in your vehicle is helpful for avoiding unnecessary distraction on the road, here’s how it works: Pair your phone with the truck’s stereo. To do this, turn on Bluetooth in your phone. Next, press the...

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...
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...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...