Ferrari Mailing List: Re: 512 temps

[Clyde Romero (clyderomerof4]

You know that's an idea that maybe it's running lean 

But why? 

The ECUs are the same for all 512's

Could be a an O2 sensor but then again why ?

I doubt if it was a intake leak the engine had on 16k on it 

Going to clean all of the 3 temp sending unit sensors (2 to the ECU and 1 to the gauge ) 

And see if that makes a difference any 

Like I said it just runs at 195-200 well within the normal operating range but the fans stay on because the fans come on at 195 or so temp

This is a stumper for me 

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Clyde Romero

Clyderomerof4 [at] bellsouth.net.          

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On Jun 14, 2015, at 12:27 AM, Doug & Terri <dnt [at] dock.net> wrote:

Clyde notes rising engine temps in his 512 TR “Going to do a block test to see if I am getting any leak a minor one thru the head gasket into the coolant.  That's the only thing left “

 

Certainly one of the last things – but advanced timing (is your car ‘chipped’?) can cause this as well as a lean mixture.  You’ll need a separate set of instruments to check those.  Also a weak O2 sensor not responding to too much O2 is another.  A lean mixture caused by an air leak.  Go around the intake joints with a propane torch – UNLIT of course.  Any change in RPM – that’s an air leak.

 

Of course, I could be wrong on these but my advice is free so you know what it’s worth.

 

Onward

 

DOUG