Does your truck make this wistling sound at idel?
Can you tell where the noise is coming from?
only that it comes from engine, probably closer to top of engine
Is it a wistle or a roaring sound?
no its just a high pitched whine type of whistle
If it is a wistle sound then it has to be caused by a vacuum leak.
To find a vacuum leak get a can of carb cleaner with the engine running spray smalll busts of carb cleaner on all the vacuum lines, intake gaskets, and all vacuum hoses a section at a time. When the vacuum leak sucks in the carb cleaner the rpms will change.
where do i look for the cause
ok will look into that. Are there any risks to the engine?
Not by using the carb cleaner to find the leak. But if there is a vacuum leak then yes if it gets worse it can cause a lean condition that can damage the valves, plugs, and cats.
I need to get some carb cleaner, will try to let to let you know what I find out. Will probably be a couple days. I dont have computer access at home.
That will be fine.
I tried that and didnt get results, but i didnt know exactly where all to spray. I need to have someone help me with that. Will try to let you know what we find out.
If you can not find a vacuum leak then try cleaning the iac motor and the boar where it sits to make sure that there is no carbone deposits restricting the openong.
Let me know if this does not stop your wistle.
ok will probably check it out more over holidays will try to let you know next week.