I posted about inconsistent boost about three weeks ago... 99.5 1.8TQM forged DV, ECS N75 race valve, otherwise stock. My waste gate seems to be in good shape I am able to use long needle nose pliers on the actuater shaft and it seems to move free forward and back, so I think it is mechanically sound. I have visually checked for leaks (I know that's not 100%). My boost all there or not at all with no consistancy.

Just got the P-code P0332 == (Knock sensor 2 Circ Low Imput in Bank 2). My question is, could this be causing my inconsistent spooling/boost? It is about a $45.00 part so I will replace it no matter what, but with all the research I have been doing over the past few weeks about boost I did not read anything about Knock Sensors being a cause.

 

bump

 

yes it could effect the performance because it adjusts the timing if a knock is detected, check list says bank 2 front sensor remove and clean surface of any corrosion then tighten up to 20 Nm 15lb/ft

 

in case you ask where it is

[IMG]local://upfiles/12092/408E855CD0E74AE7AE31EAFCC32B2D9E.jpg[/IMG]

 

Want to be sure I spend the time on the correct sensor. I have two knock sensors and the one in "bank 2" is the problem. In the pic is #23 bank 2 and #22 bank 1. I could not find the specific area of "bank" 1 or 2 in my Bentley manual.

Thanks for the help. I'll follow up with the results.

 

#2

[IMG]local://upfiles/12092/C67278D721EA4E5B822F046128C4D2D7.jpg[/IMG]

 

see Bentley isnt that good

 

Problem solved.

My Bank one (1) and Bank two (2) were backwards. I am the third owner of this car, so who knows when or how long it has been this way. The plugs for the two knock sensors are directly under the washer fluid resv. They are color coated green for Bank (1) which is the sensor closest to the firewall, and blue for Bank (2) which is closest to the front bumper. The male/female colors of the plugs were correct, so visually it appeared to be right but...follow the green sensor wire and it led to bank (2). So someone had bolted the actual sensors in the wrong banks.

So instead of unbolting and swaping I just switched the plugs under the wiper resv. The boost is consistent and the car runs perfect, I'm just going to explain others that I am not color blind

===Faulty knock sensor symptoms; Incosistent boost, in and out of limp mode at random.

Thanks Dave.