Feels like a misfire under load 🤷****♂️

[blue62]

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.

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.

[blue62]

Colacharlie,

This is going to sound crazy:
With the recent work done on your car (the Variocam work).
Was any of fuel injector wiring disconnected????
If it was go back thru them and make "certain" the right wiring connector is connected to the proper injector.
A Fella here on the forum has been having a very similar problem as you.
Misfires without any codes. Bogging or judder when trying to accelerate.
He had two injectors crossed up.

Let us know what you find.

[colacharlie]

Originally Posted by blue62

Colacharlie,

This is going to sound crazy:
With the recent work done on your car (the Variocam work).
Was any of fuel injector wiring disconnected????
If it was go back thru them and make "certain" the right wiring connector is connected to the proper injector.
A Fella here on the forum has been having a very similar problem as you.
Misfires without any codes. Bogging or judder when trying to accelerate.
He had two injectors crossed up.

Let us know what you find.

Good thought and point that buddy and a good check for anyone going through anything similar…. for me though it’s all good as I was able to replace the variocam etc from underneath with no need to remove the injectors or their rail 👁👍

[blue62]

Originally Posted by colacharlie

Good thought and point that buddy and a good check for anyone going through anything similar…. for me though it’s all good as I was able to replace the variocam etc from underneath with no need to remove the injectors or their rail 👁👍

Well crap...looks like you want to keep things interesting

[Stl-986]

with all those different codes & on both banks, it is most likely a wiring issue. Something isn't connected right or not at all.

[colacharlie]

Originally Posted by Stl-986

with all those different codes & on both banks, it is most likely a wiring issue. Something isn't connected right or not at all.

Okay buddy I’ll have a probe about and go over my work ��

NOTE to anyone changing their injectors- bank 1 easy. Bank 2 a total and utter muva pucker!

[colacharlie]

Originally Posted by colacharlie

Okay buddy I’ll have a probe about and go over my work ��

NOTE to anyone changing their injectors- bank 1 easy. Bank 2 a total and utter muva pucker!

I would like to start by thanking you all for your help thus far.

I found myself so disheartened with ‘Hans’ the 2.7, that after spending so much money and so much time and the problem still persists, that I have bought myself a 3.2 S low mileage from a guy who is most excellent.

I am lucky and have the space so that Hans (the 2.7) has a cosy place to sleep until I have the heartfelt energy it takes to continue on.

I am wondering, as I only replaced three of the coil packs (on Hans) - my question and pondering is that- does the ECU read only the voltage to the spark plugs, and thus would not show a coil pack failure on the Durametric? Or if one of the remaining three (old) coil packs are potentially failing1 would that potentially cause this problem, and would it show up on the Durametric?