Q: Runs rough after it gets warm

asked by on

It seems to run fine when its cold but after it warms up it runs and idles rough and will even die? I put new plugs,wires,ignition control module,camshaft sensor,crank sensor, it has a new catalytic converter. I was told it has a bad evap leak can that make it run roughened die?

My car has 198000 miles.
My car has an automatic transmission.

Hello, It sounds like you may possibly have a stuck EGR valve. The EGR valve allows the flow of exhaust gases into the intake manifold in controlled amounts. When you start the motor, the valve remains in a closed position, blocking the flow of exhaust gases. Once the engine reaches operating temperature and speed increases, the valve, either through vacuum or electronic control will gradually open, allowing burned exhaust gases to enter and combine with the air-fuel mixture inside the combustion chamber. When the EGR valve is clogged or dirty, as they are prone to, it may not function properly causing the engine to idle rough, stall at idle speeds, cause the car to get poor fuel mileage, or emit a strong smell of fuel due to excess hydrocarbons which also results in failing emissions tests. I would suggest having an expert from YourMechanic come to your location to diagnose and inspect your vehicle.

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. Runs rough after it gets warm

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: Q: I have a burning smell in my car.

This is not likely. A dirty cabin filter filled with old pine needles is more likely to cause a moldy smell inside the vehicle. The burning smell may be coming from a a shorted circuit somewhere in the car. Consider...

Q: How many quarts of transmission fluid goes in a 2006 Grand SXT Caravan

The initial fill on your van should be 4 quarts, however the total capacity on this van (41TE transmission) should be 9.7 quarts. If the transmission is low on fluid, this will definitely cause it to hesitate when shifting from...

Q: New battery, car still won't start. Single click sounds, like a dead battery

It sounds like you may have a faulty starter solenoid. If you hear a clicking sound when turning the key, it is likely that your starter solenoid may be faulty. The starter solenoid is located on the starter and has...

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...
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.