MAP sensor location

[amx2334]

Probably not a problem on PT cars but you don't want a low spot in the hose.Condensation can build up in the line. I used to work on alot of K-cars.

[viper11]

I
have mine under the throttle body at the back of the manifold
don't quote me on this but I read on a very reputable site that vaccum hose length(a few feet) has a negligable effect on the signal
anybody know for sure???
jason

[red67camaro]

The MAP vacuum needs to be sourced from the plenum to keep pressure pulsations to a minimum.

I've seen quite a few vehicles that come from the factory with 2-3 feet or more of vacuum hose to the MAP with no ill effects. I've even seen some with a small inline reservoir to, I assume, dampen pulsations and/or keep fuel vapor from reaching the sensor. In later years, I've seen more and more MAP sensors mounted directly to the manifold with no hose at all.

Adding length to the hose will slow the MAP sensor's response to actual manifold pressure changes so keeping it as short as possible would be a good thing. That being said, I wouldn't worry too much about having a foot or two of hose as long as it was of suitable diameter and had no kinks or other restrictions.