I know, but can't recall, there is a way to detect a vacuum leak using carb cleaner. I think my rig has a vacuum leak(s) and would like to check it using this method.

What is the process?

 

spray it around... if it stubles or races you are clsoe to the leak

 

OK, I'll give that a shot...I was just thinking there was a little more that. I'll try it and report back...thanks!

And Jim, have you been drinking?

 

nope.... havent been drinking..... im dyslexic though, and sometimes when i type my brain processes funny and the letters get jumbled in when i look at the keyboard

 

Oh man, I was just kidding...don't take it the wrong way, I was just goofing around. Sorry, bud...

I've been drinking though...I'll have a brew for ya.

Thanks for tip...I'll give it a shot tomorrow if the weather is good.

 

The carb cleaner method works, but it goes in a pretty wide area. The best way that worked for me was a stethescope (spelling?) with the end off so its just a small tube.

 

Another method is to use a propane torch. With NO FLAME of course. Just direct the nozzle, spewing propane fumes around where you think the leak is and the engine will speed up when you get close. The propane is also a bit easier on the plastic engine parts than carb cleaner is.

 

Might want to be careful with this one! Propane is heavier than air, so it will "pool" in low areas until wind, or ignition gets rid of it.

 

In an enclosed space I would tend to agree, but in an engine compartment, with the fan blowing, it's all you can do to get the nozzle close enough for it to work before it gets blown away.

I am more worried about spraying a flammable liquid (carb cleaner) around my engine compartment than I am about propane collecting in some out of the way cubby hole. Besides, the fumes from carb cleaner will pool in the same way.

 

That is why the stethescope idea is probably the best. Aren't the fumes from carb cleaner lighter than air? gas fumes are!

I think we can all agree not do do either of these methods in an enclosed space!

 

...or while smoking!

 

use starting fluid, it has a more direct effect on the idle change

have used carb cleaner too,,,however i prefer the starting fluid