Skip the auto shop - Our mechanics make house calls

Q: I get 5 miles per gallon truck stalls at low rpms

asked by on

I get 5 miles a gallon it stalls when coming to a stop or at low rpms it shakes or vibrates. In drive in neutral it smooth out it cranks abit before. It starts but it always starts. Has new plugs wires cap rotor ....timing chain and radiator. Were replaced at 120k it now has 176k. There is a strong smell of gas but no leaks I mean strong a guy behind me In traffic going 60 at light told me he could smell gas

My car has 176000 miles.
My car has an automatic transmission.

A: This may be a sign of a failing idle air co...

This may be a sign of a failing idle air control valve. The idle air control valve monitors the air intake as it is mixed with fuel prior to being injected into the engine. This valve is controlled by the vehicle’s computer, which will adjust idle speed based upon other measurements such as engine temperature, intake air temperature and electrical system load or voltage. The purpose of this valve is to allow the engine to return to a normal idle speed after the engine RPMs have been increased. This valve slowly controls the air/fuel mixture going into the motor to return the engine back to a slow speed or idle. However, when the engine RPM drops below the normal range of 750-800 RPM (for most cars) the vehicle may stall as you have experienced and this may indicate a dirty or faulty idle air control valve. This may also cause poor fuel mileage as you have also experienced. I would recommend having an expert from YourMechanic come to your home to replace your idle air control valve.

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

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: My car overheats within 20 minutes of driving. A goo jelly like substance is overpouring from the radiator. The top is cracked.

It sounds like you have been using the wrong coolant for your engine or the transmission cooler is leaking transmission fluid into the coolant. Either way you need to replace the cracked radiator and flush out the system with clean...

Q: How do I use a USB drive to play music?

You can play music that is stored in a USB drive directly through the infotainment center. Here’s how: Plug the USB drive into the USB port, which is located in the center console. Make sure the device is compatible...

Q: Truck making a knocking noise .

Hello. You should contact a certified mechanic before running the engine anymore, to avoid any further damage or causing an unsafe driving condition. They should have the specialty tools and techniques to properly diagnose the problem. Without some further information,...

Related articles

P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.