I just had a local shop install a new Stage 3 clutchmasters clutch and 72 lb injectors from EPL.

I have been having the following codes:
The Faults are: P0300 Misfire detection [P0306 cylinder 6; P0304 cylinder 4; P0305 cylinder 5] and P0040 Oxygen sensors in front of cat. conv. switched.

P0040 Oxygen sensor ahead of catalytic converter – signal implausible (only Turbo)

Possible fault causes
- Oxygen sensors ahead of catalytic converter exchanged
- Line polarity reversal in wiring harness
- Simultaneous occurrence of leaking fuel injector on the one bank and leaking intake distributor on the other bank

Now my mechanic has checked the o2 sensors and all looks okay , they are looking at injectors . But they and renntech has indicated that resurfaced flywheel can cause timing to be off.
http://www.renntech.org/forums/index...howtopic=26631

Has anyone here had timing issues with resurfaced stock dual mass flywheel ? has anyone here seen these codes when using a stock flywheel?

Basically the car just bucks and throws misfire codes when on boost.

 

what rpm is it bucking at? Has EPL given you any suggestions?

 

It happens around 4k-5k on boost only...also all misfires are isolated to bank 2.

Yes Tony was very helpful, he thinks its a mechanical issue with either the injector install or the o2 sensors. The shop thinks the injectors are installed correctly and the stock flywheel could be causing the timing related issues.

That's why i want to know if anyone here using the stock flywheel has exp these misfires due to spring loading tension not able to support the new stg 3 clutch.

 

Were the o2's removed? Is it possible the o2 sensors are backward? The fronts are in the rear and the rears are in the front?
Also, I was under the impression that the factory dual mass flywheel could NOT be resurfaced?

 

The shop tells me that the 02 sensors are the correct location, but they are going to put in new sensors tomorrow. Maybe that will fix the issue. If its in the correct location then why am i getting this code ...this code is for swapped o2 sensors

I know others who had their flywheels resurfaced with no issues, what flywheel do you have?

The shop also tells me that the tune is too rich causing misfires , but why would it misfire on bank 2 alone?

 

I reused stock flywheel twice with no issues. I seriously doubt flywheel is problem.
I suspect a problem in the install of O2 sensors or injectors.

 

the factory flywheel must be checked for slop before machining otherwise it can be machined incorrectly but it can be reused just not an average job on the resurface like most flywheels

 

That's what i am hoping it is , the shop tells me its the tune...I am having a tough time believing its the tune , because EPL has many cars running fine with the same file.

 

I was told the factory flywheel looked okay and did not need any resurfacing...i need to double check if they did resurface the flywheel.

But either way can the springs and load of new clutch cause this timing issue.

 

the clutch pressure plate has nothing to do with how the timing is set or reacts flywheel installation might but i severely doubt it.

 

This is what my mechanic thinks it is... I never heard of this being a common issue.

"The only mechanical possibility or electrical possibility is the weight of the new clutch affecting the dual mass flywheel which seems to be a common problem on the 996. The crank position ring is built in to the dual mass flywheel. Not choosing to replace the flywheel may have been a bad choice...... we are looking into this now."

 

unless your flywheel was fubar i really doubt it has to do with that id say its more to the items that affect the tune of the car that you replaced or something during the install

 

are you sure the front o2's are up front and the back are out back? 5 wire up front

 

I will let them check and replace the 02 sensors and see if these issues go away. Tony sent me a new tune for the 72 lbs injectors, so that should have taken care of the fuel delivery.

So i guess i can cross off flywheel being the issue now.

 

I am not sure how it went into the car, the shop had to drop the motor to do the injectors and clutch. so i am assuming they have the disconnect the o2 sensors ...and something might have got mixed up when they went back?

The car is running very rich , and has these misfire codes on only bank 2 4,5,6 cylinders.