Q: Car running really rough

asked by on

I own a Mazda Tribute. And it's been running on like 4 cylinders we've tested the coil packs and changed them and the same with spark plugs. We cannot seem to find the problem. It is automatic and it sounds like it wants to stall. Just won't idle. It stalled me the other day we've also checked the cat converter and that's fine.
My car has an automatic transmission.

Hi There, If you have tested and checked all coil packs and spark plugs with everything checking out properly, it may be likely that your issue is related to fuel delivery such as low fuel pressure or potentially a dirty or faulty idle control valve. The idle air control valve monitors the air intake as it is mixed with fuel prior to being injected into the engine at low speeds and at idle. This valve is controlled by the vehicle’s computer and will adjust idle speed based upon other measurements such as engine temperature, intake air temperature and electrical system load or voltage. This is also an important function when starting the motor as it allows the motor to run and idle on it’s own once the motor fires. When you accelerate, the engine RPM increases, and as you let off the gas, the RPM slowly returns to the normal idling speed with the help of the idle air control valve making the transition from a higher RPM back down to idle speed while adjusting the air/fuel ratio constantly to allow this to happen smoothly. When the engine RPM drops below the normal range of about ~800 RPM, this often times will cause the engine to stall indicating a dirty or faulty idle air control valve. I would recommend 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. Car running really rough

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: Camshaft position sensor

The camshaft position sensor on your vehicle is located near the front of the engine slightly to the left (when standing facing the motor). It is a very small black plastic piece that plugs into the side of the engine...

Q: How do you determine when it is time to replace the rear shocks?

Hi there. As a former Lexus master technician I used the leak criteria guide provided by Lexus for the technicians to determine when to replace the shocks and struts. The guide had levels ranging from 1 (no leak) to 5...

Q: Airmatic system not rising

Issues with this system are not common. The system has a set of bags that get filled with air to level the car when the sensors determine it is riding low. If the pump fails or the bags themselves develop...

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...
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...
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...