I've been working on some idle issues and made this to summarize what I've figured out so far. I plan on expanding it to include test procedures for each component. Please make any comments to improve it or things to add etc.

. . . This is the kind of thing I do when the weather sucks

 

Excellent diagram--thanks very much. I have two suggestions:

-arrows indicating exhaust gas flow could be red (blue = fresh air, red = hot gasses), as well as the flow of EGR gas through that pipe back to the intake side.

-add a legend to explain the acronyms IATS, IACV and so on. Then you can use the acronyms under the Common Causes of Idle Problems section, making it smaller.

I don't really want to wish you more bad weather, but if it results in more of these diagrams being posted...

Thanks again,

Greg

 

Thanks Greg - Good ideas

 

Replacing my crank sensor fixed my idle issue. No more dying at lights.
RagJag