Engine stalling

I have just found 2 videos about engine stalling and low idle problems as related to do it yourself auto repair for these common car problems.

I also found an odd video that shows you how to clean your throttle body and Idle Air Control Motor. This can cause both a stalling and erratic idling condition. These recent auto repair videos where posted on the tube and I received permission to post them for our website visitors as well.

I also discuss the leading cause of idle problems on older vehicles. This would be a vacuum leak. Most likely from a leaking or deteriorated line or hose.

Stall condition or low idle

The IAC is completely responsible for the engine drive ability characteristics when idling. The cars computer controls a pintal valve that allows a small amount of metered air to enter the engine or throttle body. The computer continually adjusts and meters the air while monitoring engine rpm.

When this system malfunctions you can have a low idle condition or engine-stalling. Sometimes the pintal valve and the airway passage can become clogged and restrict the air flow which degrades the computers ability to make the idle adjustment.

You can remove the IAC valve and inspect and clean the air passage and pintal valve. This may cure the engine stalling condition. Here is a video that walks you through the basics of the throttle body service.

Engine stall from a vacuum leak

A broken vacuum line or hose is just as common today as it was back in the 70's. Even though the vacuum lines are now made mostly of hard plastic they can still crack and break from the extreme heat they are exposed to.

A small vacuum line breaking may cause an engine idle to fluctuate. Where as a large vacuum leak will almost always cause a stalling condition. A close inspection of these vacuum hoses should reveal any broken ones. But pay close attention to 90-degree bends and also the attaching points to the intake manifold and throttle body. These areas take the most stress.

If you have a scan tool you can pull up the IAC data and confirm a vacuum leak by watching the IAC steps. When an external vacuum leak develops the computer will try to compensate for it by running the IAC all the way in and this would read 0 steps on the scan tool.

When it comes to testing the Idle air control motor this is within reach of most diy car mechanics. Testing is worth the time because this electrical car part can be expensive and is a non returnable item.

This car repair video does a great job of showing you how to approach diagnosis and determining if the part actually needs replacing. If it is not the cause of your engine stall give it a cleaning and move on with your troubleshooting.

Honda stalling condition

There is a technical service bulletin out on early 2000 model Honda's. This document provides further insight into how the engine could stall by the vehicles PCM ( Powertrain Control Module ) controlling the fuel system.

From what I read there is a problem with the PCM controlled relay that provides power to the fuel pump. You can contact your dealer for more information on this or watch my video on how to find and use auto repair bulletins

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