Help needed: Misfires and other CEL's - Detailed account of the situation

[hodroyd]

Keep going mate you will get there..!!

 

[voicey]

Update: exactly the same as before after a drive. P0300, P0308, P0307, P0305, P0306...
I guess the P1602 was because of the battery reset.
At idle: LTFT1 is 12.5 and LTFT2 -3.9...

Coil resistance are actually fairly the same on all the now 6 coils I have lying around...

Next step: CPS change.

When you write LTFT1 is 12.5 and LTFT2 -3.9 is that bank 1 and bank 2? I ask as there are actually four LTFT values stored by the ECU but most OBD scanners only give you two.

Assuming that your LTFT on bank one is 12.5 then the Lambdas on that side are reporting a lean condition. If this car were in front of me I would want to understand why the ECU is adding more fuel on that bank.

 

[ecarca]

Keep going mate you will get there..!!

I hope so! Craig is taking care of me and is helping me to balance the clutch in the US, before sending it to me. He got all the parts for me.
At least I have peace of mind for that.

That misfire issue I have, it is more like a challenge. I WANT to find the problem even though the car drives fine with MAF unplugged. I just would like to have it perfect but so far, I have no luck.

 

[ecarca]

When you write LTFT1 is 12.5 and LTFT2 -3.9 is that bank 1 and bank 2? I ask as there are actually four LTFT values stored by the ECU but most OBD scanners only give you two.

Assuming that your LTFT on bank one is 12.5 then the Lambdas on that side are reporting a lean condition. If this car were in front of me I would want to understand why the ECU is adding more fuel on that bank.

Yes!
And yes, I would also like why the (new) lambda are reporting a lean condition. But so far, I haven't find any good reason for that. If you have further ideas, I would be a glad taker!
Thank you.

 

[Trev Latter]

Apologies if you've already covered it, but have you reset the long term fuel trims? (I would think you'll need sd2 to do this). It may be a case of the long term trims applying changes based on previously failed/failing sensors. You seem to have covered a lot of bases already, so it may be worth a go. If nothing else gained, it'll reset the baseline for the ecu and may help with further diagnosis. With fuel systems as complicated as these I would imagine even a slight variation in several sensors could have quite a marked effect.

 

[hodroyd]

You could try asking the advice of such as Autoshield Maserati in Manchester (a sponsor on here), they are very good and very helpfull with all things Maserati..??

 

[voicey]

Yes!
And yes, I would also like why the (new) lambda are reporting a lean condition. But so far, I haven't find any good reason for that. If you have further ideas, I would be a glad taker!
Thank you.

Unmetered air leak (Ferraris are notorious for the gasket failing between the head and the inlet manifold)
Faulty MAF (you can scope the signal to see how good it is but it would affect both sides as there's only one on the Masser)
Cracked/leaking exhaust manifold
Faulty secondary air system
Faulty Lambda
Low fuel pressure (do you have one pump per bank?)