Well after conferring w/ a professor of mine, he seems to think that if I had an intake gasket leak, that would cause low vac at idle. I did check the vac at the intake with a new vacuum gauge. I don't have high idle but I still don't have the leak fixed. Also, does everybodys' idle kinda "hang" when their heater is on and a fan going?

Shit is all apart. Typical...

Mine will hang whenever the compressor's not running after it's been on teh highway for a while. If the AC or defroster's on, it drops right to where it should be. Other than that, she's got some idle issues too.

Vacuum leaks don't always cause high idle. Remember, you've got a computer controlled idle air motor that is trying to seek a certain RPM when you're off the throttle...

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'95 Eclipse TurboGS (garage deco)
'95 TSi AWD (restoring a survivor)
'97 Talon ESi-T (poor impulse control)
'99 Eclipse RS-T (daily beater)
'13 Evo X (mostly stock)
'17 Sienna (Middle Aged Dad Mobile)



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I kinda figured that, but would a leak in the intake like that give shitfits to the MAP? I have to go pick up a can of WD-40 to check it running to see if I have a leak. Dino,if you have read any of my other posts, what is your guess on WTF is going on.

Shit is all apart. Typical...

I had a leak at the intake manifold on my car and it was causeing all kinds of idle problems. Yes the AIC motor will try and regulate the idle but with a leak that big after the AIC it will cause idle issues and your fuel control will be erratic also.

No probs with idle or fuel delivery as far as I can tell. How about the TB gasket? That's at the IAC.

Shit is all apart. Typical...

You can have a vacuum leak in any of the vacuum lines, to/from EVAP, to EGR, to Cruise Control, any vacuum line you have can be a source. Also if a manifold or TB gasket is bad or not tightened down it can cause a leak. You can leak aroun the IAC also. The O-ring on the TPS can be pinched and cause funky idle as well.



15.9 @ 86.7mph

Smooth idle? We don't need no stinking smooth idle.

Mods List:
http://highlander.dsmpower.com/sig.htm

I have a solid idle, that's one of my problems. Did anything that you described cause a good idle/ good drivability problem but loss of vacuum?

Shit is all apart. Typical...

I will Paypal IMMEDIATELY the person who can get me pointed in the right direction. (BTW $10 is roughly the cost of a decent 12pk of beer) Also can anybody tell me where the vac line starts for the HVAC vents? This was a problem in a much older car that I have with the line getting hot and cold and breaking. I have nice 800 idle, no smoke, 180 psi in all cylinders, and 10in/hg that has disapeared to vacuum-land.

Shit is all apart. Typical...

This is a really really old post, but Erik.. did you ever FOUND the solution or answer to your problem?
Thanks man.
Greatly appreciated.

~~~~~~~~Modification~~~~~~~~
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1995 RED Eclipse GS-'T': Stage VI 20PSI
2010 Audi S5 Quattro