Losing a bank of cylinders on idle

The coils (perhaps just the coil module) can cause these problems.

 

Sounds like the coil packs. Swap them over and see if the fault follows

 

Do you have a T? I had a T with the same problem, it turned out to be the lambda sensors.

 

I agree with the idea it's a coil pack, which is the small bit about 1/2 the size of a cigarette pack. I think that 4 small screws hold it on. As stated, swap them to the other coil. If the problem changes to that bank of cylinders, that's the problem. Don't forget the thin electrical paste-like coating that should be applied. (Can't remember the name of the compound; is it dielectric something or other?)
A coil pack should be about $160, while a complete coil w/ pack is closed to $450.
Good luck!

 

It's a QV = the "coil packs" are inside the DigiPlex ECUs, but it wouldn't hurt to swap the connectors on the DigiPlexes and/or swap the coils to see if the problem moves to the other bank or not. However, before even doing that you could confirm that the AC voltages from the two TDC sensors are similar (and reasonable) at idle RPM and higher RPM. They are a gizmo that might not work well enough at idle to fire the coil pack, but could work a little better, i.e., have a little higher signal with steeper d(volts)/d(time), at a little higher flywheel RPM (which moves the flywheel pin a higher speed past the sensor. Good Hunting!

 

Check out this old thread from the 328 guys about the ignition transistor coil replacment, some good resources, if they are still in business.

http://www.ferrarichat.com/forum/308-328-sponsored-yellow-compass-group/248082-328-ignition-coil-replacement-options.html


This part? http://1107988.en.makepolo.com/products/Ignition-Module-XM631-FOR-Alfa-Romeo-Fiat-Lancia-Ferrari-p95371939.html
Alden

 

It was the rotor on my QV, it shortened to the cam shaft end. Starts with an occasional miss, then develops into a lost bank.

 

Nice work!

 

Nicks Forza XDI ignition solved all my issues. No more rotors and caps. No more digiplex boxes. A bit pricey but a very nice and neat setup
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+1

Looking nice.

 

Very nice but what does "pricey" look like, not seeing any prices on their website.

 

1600 last year. Don't know if any inflation

 

If you get this and you suspect the coils, do the following. Start the engine from cold and drive along until you get the misfire- jump out the car with the engine running- if coils then 1 will be warm or hot and the other cold. The cold one is the good coil and the warm or hot coil is breaking down hence the temperature difference.
Same symptoms but fuel raising sump oil level- this is a failure of the diaphragm in the bosch k tronic system- the distribution block with all the banjo bolts and small injection pipes-when this fails it runs max fuel on the individual injector , relative to cylinder diaphragm. You can get a bosch repair kit for £50.

 

Hi Fred:

I am resurrecting this old thread because I'd like to know how the Nick's Forza direct ignition is faring over the long run? Are you still enjoying trouble-free motoring? Or have you had to work on the ignition system over the past few years?


Thanks,
Sam in Saratoga

 

No muss. No fuss. Trouble free so far.