Low idle at startup

No answer to the question, but mine is very similar.

 

Mine does it first start of the day. It seemed to do less of a stumble the one night it spent inside the garage since its warmer in the garage but it usually lives outside.

 

If you recently had belt change maybe your timing is slightly off from the ideal... Even 1 or 2 degrees can make a big difference at idle and throughout the rev range !!!

 

Read the post's, it's only on start up for a couple of seconds. So it's not the timing belts.

When my car was in for service I mentioned this issue. They cleaned & resealed some key ground points (didn’t tell me which ones, sorry).

The car didn’t act up for the rest of the summer. Then after winter storage it started doing it again. Only happens on 1st start of the day & lasts for 5-7 seconds.

The way it was explained to me was the ignition system comprises of two independent systems "Master & Slave"

On start up the Master system sends a signal to the other to switch on.
The delay can be increased with a weak ground.

 

Mine does the same. It almost, but doesn't stall, for the first 5 secs or so, then bursts to life. It runs perfectly all the time except - just as others say, the first start of the day, though it seems worse on cold mornings.

As it came into winter, it seemed worse and my battery was weak, so I replaced it. It didn't improve - just cranked quicker.

Maybe it isn;t a problem, just a trait of the 360, or perhaps Enzo keeping us entertained.

 

It shouldn't be doing this. It's a common trait of a failing MAF sensor. They can be checked with an oscilloscope for the output voltage. Very often they won't flag a fault in the Motronic ecu's either.

 

A frequent (normal) occurrance for 360/430s. Some people (including myself) note it more often when the car is sitting longer...I haven't had this occur for the past year or so on mine since I drove the car regularly (every couple of weeks at least in the winter if there was no salt on the roads), but before that it would happen typically on the first start and not every time. The more you use the car, the less it seems to happen.

If you search there are many old posts on this subject. If it happens, you can immediately turn off the key and re-start the car and it should start up normally. Or you can do what my mechanic recommends and just let the car get to idle on its own- no pushing the gas pedal, let it do its thing. Sometimes people note a little bit of smoke when this happens, but it's OK.

 

I had the same issue before swapping out the ignition coils and MAFs. Now it runs like a champ

 

This is a common issue and can be fixed by clearing the adaptive settings in the ECU. See one of my old posts: http://www.ferrarichat.com/forum/showpost.php?p=141135377&postcount=2

You can search "rough start" or similar and will find this is extremely common, but like I said, it can be fixed. I used the strategy mentioned in the link as my 360 started up weak like this when I bought it in Oct. It completely fixed the issue with the car roaring to life immediately without the weak sputter and has been perfectly fixed for the past 7 months. Ironicaly, it just started this weak startup again three days ago, and has done it twice in a row now. It's been about 2,000 miles driven since it was last done, so I plan do to the quick fix again. I may try just clearing the adapative settings, then let it idle to fully warm once, rather than three full cycles to warm, cold, warm, without drivign in between, to see if that works as well. I'm not sure why three cycles would make a difference, I think the key is clearing the ECU's setting and having the car relearn it's parameters.

I forgot to mention, I acutally had this done at a shop last time while they were doing the major, so I'm not 100% clear if the ECU values were cleared by battery disconnect or by computer. I'll check on this.

 

I confirmed with the shop that the adaptive values need to be reset by the computer (SD or Leonardo), and battery disconnect will not clear them.