Quote:
Originally Posted by ike84
the injectors for the 2.7, 3.2, and 3.4 are all the same from 00 - 02. the dme just runs them on different duty cycles to adjust for different fueling needs.
these injectors are no longer being made. they were a special part made by bosch specifcally for porsche. you can remove yours and send them out for cleaning and testing (which costs about $30 per injector plus shipping), buy a remanufactured set from a company called reman, or do the 986.2 injector swap. If youre worried about the injectors, I recommend the latter - you can get them for $25 a piece and the modification takes less than 5 min per injector with a dremmel.
before you do this though, do as blue says - repeat your vac test. if your vac is still low then you haven't fixed your problem. bad injectors dont cause low vac pressure.
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Actually anything that causes a misfire results in what is called "cylinder power imbalance" which results in a drop in vacuum for the cylinder or cylinders experiencing the misfire. It is commonly seen as a "tick" of the vacuum gauge needle when the misfire occurs.
The needle reacts very much like a single cylinder valve train issue. (if it is a single cyl misfire) or multiple cylinder valve train issues if it is multiple cylinder misfires.
The needle action is identical in some instances.