Ferrari Mailing List: Re: Quirky stuff, 308 idle woes

[Rick (rolindsay]

No switches on this baby.  Fully Standard Specification.  Only change from stock is ceramic coated headers and no rattly heat shields.

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-------- Original message --------
From: Doug and Terri Anderson <dnt [at] dock.net> 
Date: 03/10/2013  9:38 AM  (GMT-06:00) 
To: 'Rick' <rolindsay [at] yahoo.com> 
Cc: 'The FerrariList' <ferrari [at] ferrarilist.com> 
Subject: RE: [Ferrari] Quirky stuff, 308 idle woes 
 

My thanks to those offering advice.

 

My advice is free Rick - you know what it's worth. <g>

 

Do you still have the 2 dizzy Marelli 73 point system? (Just joking but who
needs a system with four unobtainable points at a reasonable price)

 

If so - what about the micro switch on right hand side aft carb - could that
be shorting out?

 

DOUG

 

  _____  

From: Rick [mailto:rolindsay [at] yahoo.com] 
Sent: Sunday, March 10, 2013 6:25 AM
To: DOUG
Cc: The FerrariList
Subject: [Ferrari] Quirky stuff, 308 idle woes

 

Further to the 308 idle-down issue; a few more observations and
realizations.

 

1. The car only has the idle-down problem when at operating temperature. I
just realized this (duh) because it only happens on a drive - and after -
when the engine bay is hot.

 

2. I should have been more clear.  The problem happens when the air cleaner
BASE is on the carbs, but that may be a spurious and misleading data point.

 

3. A friend has my bore scope camera and he's presently in Europe.  When he
returns I'll be able to see all the linkage movement with the air cleaner
base on.

 

4. Since this problem acts like a vacuum leak - kinda - I'll temporarily
disconnect and plug the brake booster vacuum line ...just as a methodical
test.

 

5. Perhaps the issue is NOT the air cleaner but a heat issue, and the engine
only gets to operating temperature with the cleaner on.  I won't drive it
with cleaner off.  Webers spit too much fuel vapor to drive with the air
cleaner off.  Serious fire hazard.

 

6. I think I will fashon a long wire with a hook end (read: coat hanger) to
pull gently, each carb linkage in turn, to its idle stop to see if anything
might be binding once hot. At no-load, even a tiny error in throttle
position can make a big difference. 

 

7. Yes, time and detective work is needed.  FWIW, the car runs fantasticly.
I just need to correct this pesky idle-down problem.  And heat may be the
clue to finding the solution.

 

My thanks to those offering advice.

 

-rick

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