i have a bouncing idle from 500 to 1300. it sounds like a vacumleak. i was wondering if i could get a list of all places to check. and a correct way to check them! i noticed if i took the map sensor vacum hose off thorrotlle body the idle drops to 500 and stops bouncing but oes really rich!! i can smell fuel almost immediatly. i have a h23 TB on a h22a IM . no egr blocking plates. TIA

Ryan

 

so you have an h22? Here's the Vaccuum diagram:


hope this helps...
Oh and does anyone know how to resize pictures? thanks

 

what book was that pic taken from?

 

It's Helms manual. It looks like it's been used in the engine battle very often

 

Where can you pick up a helms manual? Ive looked locally, ebay, searches etc... can't find their homepage or anything.

 

Actually I had a hook up with a deaership and ended up with a 92 book cause my car is a 92 and a 94 book cause my engine is a 94 and got them for free. OEM all the way. Let me know if you guys need anything else, as you now know I have aquired a scanner too!
Good luck to all!

 

bump.

 

A good way to check for vaccum leaks is to take a can of Ether or Weedeater gas in a squirt bottle and spray on all the vaccum spots. How will this tell anything. Say you make a vaccum leak, if you spray the Ether or Weedeater gas on that spot, the vaccum will suck the stuff into the motor and you will hear it bog down. With no more than what would be sucking in, it will not hurt anything. So take and spray it in places you think the leak is and listen for it to bog. That is how i have found all of mine when i had them.

 

find a hollow mettal tube, and attach a 2 foot peice of rubber hose and use it as a stethascope, this works very well and can get you "ear" into those hard to reach places

 

can you guys explain what a vacum leak exactly is? and what to listen for?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by jdmlude_dude &raquo;</TD></TR><TR><TD CLASS="quote">A good way to check for vaccum leaks is to take a can of Ether or Weedeater gas in a squirt bottle and spray on all the vaccum spots. How will this tell anything. Say you make a vaccum leak, if you spray the Ether or Weedeater gas on that spot, the vaccum will suck the stuff into the motor and you will hear it bog down. With no more than what would be sucking in, it will not hurt anything. So take and spray it in places you think the leak is and listen for it to bog. That is how i have found all of mine when i had them.</TD></TR></TABLE>

the engine will actually start to race a little because your feeding it more gas. Check around the intake manifold and all the vaccum hoses.

 

its a very distinct sucking sound, have you ever ran the car without the intake on the intake manifold, it sounds like that .. kinda like a hissing,

and what happens is when you have a vacume leak air is actually getting into the intake manifold and the map sensor senses air and then adds fuel, and that causes the motor to rev up and down..