360 rev hunting during cold start up - Ferrari Life
 
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post #1 of 5 Old 12-30-2012, 06:56 PM Thread Starter
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rev hunting during cold start up

Recently temp has been drop n my 02 360 spider seems to act funny during cold start up. Rpm will flutuate for a few min then become normal. What could be the cause?

Thx
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post #2 of 5 Old 12-30-2012, 08:41 PM
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Cured on my 575M with a container of Techron. Cold start problems are often injector related, and the Techron does a pretty good job of cleaning the injectors. Even though I used Chevron gasoline with Techron, the concentration apparently was not high enough to keep the injectors clean.

Other fuel injector cleaners may work as well, but I know the Techron works.

Taz
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post #3 of 5 Old 12-30-2012, 10:20 PM
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Originally Posted by winsome View Post
Recently temp has been drop n my 02 360 spider seems to act funny during cold start up. Rpm will flutuate for a few min then become normal. What could be the cause?

Thx
Either airflow or fueling related.

Two other common possibilities on the airflow side. I have seen this happen when either a problem with Air flow meters or one of the Air intake gaskets (the red air intake needs then to be removed which is actually a rather simple bolt on/off affair), if one is leaking it causing extra air to get in thats effectively 'unmetered' by the air flow meters, hence the fluctuations at idle. The gaskets are only about $1 each so worth replacing all 8 if you take the intake off. As the cars get older this is an increasingly common fault.

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post #4 of 5 Old 12-31-2012, 01:58 AM Thread Starter
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great thanks for the replies will try them out.
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post #5 of 5 Old 12-31-2012, 12:49 PM
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Trev- Affirmative, the 65 deg V12s are notorious for loosening intake manifold bolts, which are only torqued to about 10 Nm. Assume the V8s have similar problems.

Taz
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Present: 575M 135171
Past: Dino 246 GT 02984, 365 GTB/4 14009, 308 GTS 25125

Every day I look around, and if nobody is shooting at me, it is a pretty good day.
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