Ford Ranger P0506: Idle Air Control – RPM Lower than Expected

P0506 This is an OBDII common trouble code. This code is usually triggered when engine idle speed falls below the limit predetermined by the manufacturer.

This is known as a generic code. It has the exact same meaning regardless of whether it's used for another purpose. Ford Ranger It will work as any other vehicle.

 P0506 Symptoms:  Ranger

Driving is the most common way P0506 will be noticed. The following symptoms are typical for Ranger.

• The Service Engine is Soon to Be Lighted– The reason why you are here.
• Lower idle speed– Assuming that the code has been thrown due to a legitimate issue, you should notice the engine running slower when not pushing the gas.
• Stalling–  The idle may be too slow for the car to run without pressing on the accelerator pedal.

Ford Ranger P0506 Diagnoses and Causes

There may be many reasons for P0506. While the code specifically mentions the “Idle Air Control System”, it would be a mistake to just go ahead and replace the idle air control valve without a little due diligence. It’s not always the cause of the code.

These are the top causes of P0506 problems in Ford Rangers. We also have some tips on how to fix them. Be aware that model years can vary. Start by searching for the a Leakage of vacuum You can then move on from there.

Vacuum Leak

Leaking vacuum systems can cause Ranger's idle to be higher. The vacuum system can leak, causing the combustion chamber to lose its air balance. 

How do you find a leak in your vehicle's vaccum? (Popular Mechanics, Article)
In less than a minute, how to find a vacuum leak (2CarPros, YouTube)

Vacuum leaks can be caused by bad things vacuum hoseThe Take in a lot, EGR SystemOr anywhere air can flow through. It’s not hard to find a vacuum leak though. Use the resources above and you’ll find it in no time.

Valve for Idle Air Control

Modern fuel-injected engines have an idle air control valve. However, not all engines have an idle air control valve. If you have determined that you don’t have a vacuum leak, the IAC is a great second place to troubleshoot P0506.  The idle air control valves can be found here It is very affordable.

How to diagnose an IAC valve (Autozone Guides)

Throttle Body

The throttle body can be opened and closed millions of times during the lifetime of a car's engine. It can collect dust from all the air passing through it. It can alter the characteristics of your vehicle's idle. When dirty, you’ll often feel the vehicle almost stall before the computer compensates and opens it a little more.

Alternativly, the code could be thrown if it is not functioning properly due to damage to the throttle body.

How to spot signs that your throttle body is going down (Repair Pal)
What to do if your throttle body is dirty or bad? Youtube, YouTube Auto Repair

Blockage of Intake or Exhaust

It could be a problem in the catalytic converter or an obstruction to the intake manifold. This can lead to idle dropping and throwing P0506. 

Conclusion

This is an extremely serious problem. We recommend that you have your Ranger serviced immediately. This is because of the dangers associated with driving an engine that could stall. You're welcome!