idle help

Joined
Mar 13, 2004
Messages
107
Location
Brooklyn NY
when coming to a complete stop the cruisers(70 F155) tends to idle high for a few moments
and then comes down is this normal
thank you

GF..
 
Joined
Apr 10, 2004
Messages
1,655
Location
san pancho, ca
I would guess one of the following:
carburetor float-level
fuel pressure...do you have the stock mechanical fuel pump?
brake booster vacuum leak...try stepping on the brakes in the drive-way, and see if your idle changes.
 

Pin_Head

 
 
 
Joined
Feb 6, 2002
Messages
14,797
Location
OC, CA
If you have a later model carb with smog control and a "throttle positioner" then this is normal operation. I'm not sure when this feature appeared, but I'm guessing '73 or 74. If you don't have a carb with a TP, then I would check the linkage for binding.
 

FJ40Jim

The Cruiser Whisperer
 
 
Joined
Sep 26, 2003
Messages
10,392
Location
Lancaster, Ohio, USA
bluemax said:
when coming to a complete stop the cruisers(70 F155) tends to idle high for a few moments
and then comes down is this normal?
Yes, it appears in your photos that the carb & emissions are still box stock. The computer tells the throttle positioner to hold the throttle on high-idle when coasting to a stop. It should drop back to idle when the vehicle stops. If the idle is staying up for more than a few seconds after coming to a stop, then there is a problem.
 

Pin_Head

 
 
 
Joined
Feb 6, 2002
Messages
14,797
Location
OC, CA
You appear to have a cable throttle, which tend to stick more than other types. If it is not the throttle positioner, try lubing the cable with "Dry Slide" (A graphite based cable lubricant available at motorcycle shops) or get a bigger return spring.
 
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