488 RPM on idle drops to 700

https://www.dropbox.com/s/ji2cf0ycnfw0fp4/VID_20190525_015448.mp4?dl=0

Hey guys,

Got a bit of a problem. My 488 on idle when warmed up drops rpm in regular intervals to like 700 for few sec and then gets back to 1000.

Ive been to a dealer with that, they stated it was just a air filter which they changed and it stopped...

... For a day or two.

Link above ( last 10 sec of the movie )

Anyone had that issue? Advices?

 

Should it really idle with 1000 RPM?

 

Well as far as I know yes

 

I asked, since my 458 idles at 700 RPM, when at temperature. As almost all other cars I had in the past.

 

See at 5:30....

 

Idle speed is 1000 revs …

Look at 1:30 min …

 

Yeah, but this engine is cold. Oil temperature is at the lower end.

 

Ok the point is not actually if its 1000 or 700 but the fact it jumps up and down. unfortunately there is only one dealer in my country and its not very competent one as far as I know from other Ferrari owners thats why I have to point them in right direction whats the problem exactly.

 

So as I understand the cold engine (oil) idle rpms should be 1000 and on a warm one it should be 700? Seems so from the movies You posted. That might be a clue I guess the car gets confused if its warmed up allready or not.

 

Mine jumps also a little bit during warm up - for the first minute or so.

 

Mine does it even when oil is over 85C

 

Idle control , several things. All to do with fuel, ignition. Need a Tech.

Also load electrical came on. Put the voltmeter screen on. See if it dips at the same time.

These alternators are smart and computer controlled. Make sure all accessories are off.

Could also be battery related.

 

New fact, it happens only when AC is on. When its off it stays at 700 rpm all the time.

@MANDALAY Thank You, good idea with the voltmeter. Ill try it today and see what happens.

 

Idles are bumped up when the A/C compressors engage. See if it correlates to clutch engagement.

 

@Streetsurfer yeap I know but the question is if they should stay higher all the time or the waving is natural with ac on. For my taste it should be bumped up all the time. But maybe Im wrong. Ill check the clutch engagement but I dont recall such a thing as I remember.

 

If it's only doing it when AC is on, there's a very good chance that it's just another case of a bad Ferrari battery gone bad. Few cars in general make enough power at idle to keep up with AC and thus taxes the battery a bit. Car compensates by increasing rpm, then voltage and power goes up, car thinks all is well and settles back down.
Try putting on the AC, headlights, and what else have you in most other cars. The instance you do, the rpm will flutter a bit. In this situation, the battery helps.

One F dealer? Where on earth are you located?

If you can get your dealer to install a new battery, demand that he installs a quality aftermarket battery.
Few things on this planet are as useless and of as poor quality as OE Ferrari batteries.

 

I allready changed the oem battery a month ago after it got to a level where it was discharging after a day of not using the car Well im located in Poland

 

Did it do the same thing right after you got the new battery, and was it replaced with another OE battery?

 

If it only does it with the AC on, then it could likely be the clutch on the AC compressor kicking in and out placing a load on engine at idle via the drive belt. You would need to have the dealer connect up the car to the Ferrari diagnostic tool and see if any of the idle controls are malfunctioning. Could also be that the AC compressor is dragging which could be bearings or something wrong with the pressure. It is very unfortunate that you have to diagnose this issue yourself. A competent mechanic is mandatory with these modern cars.