Help my car idles too high

[BoostedmaxPSI]

Maybe you should have said "I" instead of "we"!

Just poking fun, you opened yourself up for that one. Don't take it too serious...

 

[Ozsum2]

I just went thru this same issue and found a hole in a cap from the vacuum "T" on the back side of the intake manifold. Replaced the cap with a new one and my RPM's dropped back down to normal. This was on my '68 stang with a 289 and C4.

That's why when you spray carb cleaner around the base of a carb to see if the rpms pick up indicating a vac leak. It is correcting for the leanness caused by the leak.

 

[DarkBuddha]

Ok,.....................can anyone else explain why???????????????????

Did we get this question answered correctly? I've found that if a carb is overly rich at idle, that a vacuum leak can cause the idle to increase.

Hope that helps.

 

[WORTH]

Mine is an Autolite 2100. When I proposly make a leak, it bucks like a mule, and damn near dies untill I get the gauge on.

Ozsum, it depends on where you make the vacuum leak, if it is stealing most of the vacuum from one cylinder it would make a skip as it would lean out that cylinder, however most vacuum leaks do increase rpm. If it doesnt, your probubly running to lean normally. Keep in mind that when you step on your gas pedal all you are doing is letting in more air. the carb is giving the mixture. If the vacuum leak is too much it will lean out and die, but it takews a pretty big leak to do this.

 

[Ozsum2]

Ozsum, it depends on where you make the vacuum leak, if it is stealing most of the vacuum from one cylinder it would make a skip as it would lean out that cylinder, however most vacuum leaks do increase rpm. If it doesnt, your probubly running to lean normally. Keep in mind that when you step on your gas pedal all you are doing is letting in more air. the carb is giving the mixture. If the vacuum leak is too much it will lean out and die, but it takews a pretty big leak to do this.

So...............another situation where both is right. I make a monster leak by pulling off the modulator hose and the engine freaks out. He has a minor leak and the rpm increases. Glad we got that cleared up.

 

[Ozsum2]

Just poking fun, you opened yourself up for that one. Don't take it too serious...

I open up for no one. The conversations here are 2 dimensional at best and should be taken as such.