I suspect I may have a malfunctioning (failing?) idle air control valve. Every once in a while (I wish it were more consistent) I start the truck and it immediately dies... unless I hold the accelerator to maintain 1000 to 1500 rpm. Typically, as the engine warms up, the engine operates normally. Only once, the problem occurred with the engine at normal operating temperature. To remove the idle air control valve appears to be a very simple task (Only two screws from an easily accessible location.) I’m sure there’s a proper technique for checking it’s function to determine if it‘s okay, needs cleaned or needs replaced. I’d like to know how to test and if appropriate, clean to restore proper function. If it needs replaced , fine. I just don’t like throwing parts at a problem “just in case”. Especially $140 parts. Any advice would be appreciated.
Jwalker
Joined
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19,186 Posts
You might have a PCM problem, not one that will require a new PCM, just a reboot
When the engine is cold, the fuel mix is determine from software tables in the PCM, as the engine warms and the O2 sensors turn on, the PCM uses the O2 data to control mix.
I'd try a PCM reboot (battery disconnect) to see if that helps.
When the engine is cold, the fuel mix is determine from software tables in the PCM, as the engine warms and the O2 sensors turn on, the PCM uses the O2 data to control mix.
I'd try a PCM reboot (battery disconnect) to see if that helps.
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