Seriously doing my head in....Can alternator cause misfire?

That is so good the hear.
I have been following this thread for any and all info that may correct my intermittent mis.
If the reco injectors and new plugs don't do it then I'l disconect the O2s and go from there.
thanks for the update

 

Great news, Marcus ... fingers crossed that the new 02 sensors will continue the job .. !!!

an excellent thread for all in terms of complex fault diagnosis.

 

Well done Mungyz and Briz :thumbup:

Now to find these O2 sensor

 

The tech section is your friend....

http://www.pexcom.com.au/z32cms/e107_images/Replacing Oxygen Sensors.pdf

 

The O2 sensor signals may well have been swinging (thus appearing to be operating properly), but may have been outputting the wrong values for particular conditions. This would of course make the car run badly under closed loop.

 

Update:
Since completing my plenum pull. Kitty has no misfire issues.

During the plenum pull I had my injectors sent to Arvin (pennyarvs) for reconditioning, and I fitted another set that I had reconditioned earier.
The conversation I had with him last night confirmed the misfire problem was a faulty injector.
#5 had no pin on the bottom and was during testing holding open.
Its guy is SOO helpful. a true asset to the forum. :zlove:
The injector was fowling the plug due to flooding, but not showing up when pulling the coil connectors to try to find the misfire.
Even pulling the spark plugs did not show evidence of running rich.

When I drove the car and was backed off the loud peddle going down hill, as the bottom when I started to ease the throttle back on the car would some times sound like a WRX and have no power at all.
Like it had dropped 2 or more cylinders, but by the time I had pulled up and got under the bonnet, all sounded fine.

I had been chasing this problem since I had purchased the car.
First thing I did was post on the forum and most jumped on the PTU band waggon, so I changed the S1 PTU to a S2, waste of time and money (although good learning curve), as that did not fix the problem.
Changed all the corroded Coil and Injector connections for new ones, another bind ally.
Then I dropped a new set of plugs in the car and thought this had fixed the problem but it crept back in.
Sounded good at first, but I had my suspicions it was not right.
I even had people telling me it was a vacuum leak, which had me crawing all over the motor.
Finally I spat the dummy, replace all the injectors, as I had run out of thing to replace.
Another new set of plugs, gapped at 0.9mm during the plenum pull, and problem sorted.

When were your injectors last serviced? might pay to have a look at them.
Plus reco injectors = another 20 years of life.

Hope this helps you and others.

 

Alot of unnecessary work Graham or was it? Who knows what other issues were there but being masked by the bad injector/injectors. As you know I've had a similar path, but at least we are building redundancy into our cars. General poor performance from things like S1 PTUs and old electrical connectors can go unnoticed and undiagnosed for years as they commonly don't just fail (they continue to work poorly for a long time). Building a solid reliable car can take a long time, depending on the starting point . Keep up the good work mate. Oh and let us know how if feels to drive now!

 

I'm still in test mode, listening for any faults, but so far, It's Friggin Awsome