Start up after exhaust install

Good to hear... although I can't see how it would make any difference. Experts? It's a hot wire type sensor and looking at online pictures, the hot wire is exposed with the MAF installed either way.

It took me a while to figure out what was what on your solenoid valve photo, but the plumbing seems ok, according to the Capristo website (assuming the solenoid ports are the same on the type you have).
I would have assumed that the bypass valve position would have no detrimental effect on the idling (although some Capristo systems do weird things with airflow).

 

So if I disconnect the battery or isolate switch to off your saying that all faults remain??. My car is a 96 OBDII car. I've tried this and if I disconnect my battery all fault codes are erased? Can you give more info on your reply I'm curious

 

Not talking about faults. On a 2.7 car if you disconnect the battery when reconnected you have to start the car with all accessories turned off and let it idle at operating temperature for 10 minutes to allow the ECU to relearn the operating parameters. On a 5.2 car this is not required. See the below excerpts from the manual for a 2.7 and a 5.2model car. Notice there is no section on reacquiring engine parameters in the 5.2 model manual, and there is noting in manual about doing so if you read through it.

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It seems they forgot to remove the relearning procedure from my 5.2 owner's handbook (Page L7 in my Australian Spider handbook)

I think this contradiction was brought up before, but I don't think it was resolved.

 

Ferrari, like the 2.7 diagnostic codes, always clear as mud. The excerpt I posted above is from a 98. I also have a 97 manual which is the same. All they say on L7, or any page in section L, regarding disconnecting the battery is that if the battery is disconnected for a long period of time it should be recharged.

Now, there was a TB issued for the 360/575M about the OBD II drive cycle. Does it apply to the 355 OBD II cars too? It's more than just letting the car idle.

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It sound like what they are saying re the 360 is that they want it to establish the LT and ST fuel trim at idle (adaptive values) before starting to drive. But if you don't follow the procedure it should just take longer for all the monitors to reset. And from my experience with other cars, if you check the monitors after performing a drive cycle 1/2 the time there will still be a couple that are "ready".

 

I've done the "relearn" on my 98 5.2 a few times before this was discussed and a few times I did not. Have not notice a difference.

 

Oops,

 

Me three
Once up to operating temps drop the hammer and next light it idles like a kitten.
One thing i did notice is every major it idles way smother when new clean injectors are installed. It obviously gets worse over time but never enough to be considered bad.

 

You folks ever just ever wonder "if" the constant relean process for cars with battery disconnected is an a tributing factor to the header, cat issues? Always running in relearn mode without proper input from sensors.

Things that make you scratch your nutts and rekin

 

Judging by the heat in the engine bay I would guess problem with the headers is more heat cycle related and poor headers.