Q: Rough Idle and Stalling at Operating Temp

asked by on


[2002 Nissan Xterra SC] Car came with a few codes on it. One being the knock sensor. Had a mechanic replace the knock sensor and all the codes of disappeared. Since I have driven it quite a bit to ensure that no more codes come or that the "check engine light" comes either. There are none.

3 issues happen when at operating temp, no issues when cold.

1) Bad Gas Mileage. Drove about 135 miles at 75mph and got 7mpg. Drove same distance back at 50mph and got 11mpg. 2) At low speeds(0-15), coming to a stop or at idle; it has issues with sputtering like it is about to stall and die. It will stall and die about 50-75% of the time if I don't try and give it gas, although sometimes trying to give it gas doesn't even work. 3) Higher speeds it intermittently will have an issue speeding up or upshifting, tends to need me to let off the gas to upshift in order to go fast. Otherwise it will hold at 4-5k rpm unless I let off peddle. Randomly will lose power and I go from 75mph to 45

My car has 175000 miles.
My car has an automatic transmission.

Hi there. There are dozens of problems that can lead to a drop in gas mileage, some of them are serious and some can be easily corrected. Issues like dirty O2 sensors, EGR valve, or a malfunctioning mass air flow sensor might be causing the bad mileage and the increased engine RPM. You might benefit from having a professional mobile mechanic complete a car is getting bad fuel mileage inspection.

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. Rough Idle and Stalling at Operating Temp

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: Melted dashboard, smells bad and is sticky

Nissan does not have any recalls or Service Bulletins regarding this issue currently. You are not alone though, many owners in hot climates like Texas are experiencing the same issue. There is a class action lawsuit involving your car and...

Q: Q: Power steering fluid leaking

Hello there! This sounds like a malfunctioning power steering pump, which is common for your vehicle. If this is the case, the location of the leak makes sense because the power steering pump is located on the passenger front side...

Q: My 2002 Nissan Xterra will not start.

Hello, thank you for writing in. If the starter is clicking, then it is receiving power and does not have the ability to use it or does not have enough power. Check or replace the starter relay if you have...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
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...