Skip the auto shop - Our mechanics make house calls

Q: Rough idle and smoking issue

asked by on

I started my truck and a big puff of white smoke came out didn't think much of it , as I was going down the highway about 75mph I about 10 mins later I punched it to 90 and about a 1/4 a mile I stoped at an intersection and my car had a very rough idle. Any idea what causing it.

My car has 124000 miles.
My car has an automatic transmission.

Hello there, many faults will cause your 1999 Dodge Durango to have a rough idle and smoke. There are several different colors of smoke that can come from and engine. Grey smoke is typically oil, black smoke is unburnt fuel or a rich condition, and white smoke is typically coolant.

Given than your vehicle runs poorly I suspect the smoke is grey and is being burned. This can occur due to a fault in the PCV system, intake manifold issues, or low engine compression.

To avoid any unnecessary repairs, a qualified technician such as one from YourMechanic will be able to diagnose your smoking engine and rough idle firsthand.

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: I changed the cap,rotor, and spark plugs. now my dodge ram 2500 5.9L. won't start it's trying to turn over but won't. what is this

If the vehicle was starting fine before you replaced the cap and rotor and spark plugs then you need to go back to your installation of the plug wires on the distributor cap. You may have put them back on...

Q: Fan runs when car is off. Overheats when idling for a 3-minute period

Hey there. This can be caused by a number of things such as low coolant levels, a faulty thermostat, or a failing coolant fan switch. As you may know, the coolant fan switch helps to maintain the proper coolant temperature...

Q: My Durango has been running great one morning went out to start it it won't start but cranks there is No fuel getting to my motor

If the fuel pump is running but no fuel is getting to the motor then you will need to have the fuel filter checked for blockage. If filter is blocked then replace it and take a fuel sample to see...

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 to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...
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.