4.3L run-on

Running too hot is usually the first thing to check. It helps to let it
idle for a minute or two after a run. How long has it been since the raw
water impeller was changed?

"aieo" <ottprivatesale.DeleteThis@gmail.com> wrote in message
news:fcfg8b$ibs$1@aioe.org...
> Today for the first time all summer my 4.3L MerCruiser had a long "run-on"
> after engine contact was closed...what could cause this?
>
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Make sure the idle speed is set correctly and it's not idling fast or
sticking. This, combined with a hot shutdown will cause extended run-on.
Just hot shutdown by itself may cause some minor run-on.
JR

aieo wrote:
> Today for the first time all summer my 4.3L MerCruiser had a long "run-on"
> after engine contact was closed...what could cause this?
>
>


--
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Home Page: http://www.seanet.com/~jasonrnorth
 >> Stay informed about: 4.3L run-on 

On Sat, 15 Sep 2007 17:41:58 -0700, JR North
<junkjasonrnorth.TakeThisOut@bigfoot.com> wrote:

>Make sure the idle speed is set correctly and it's not idling fast or
>sticking. This, combined with a hot shutdown will cause extended run-on.
>Just hot shutdown by itself may cause some minor run-on.
>JR
>
>aieo wrote:
>> Today for the first time all summer my 4.3L MerCruiser had a long "run-on"
>> after engine contact was closed...what could cause this?
>>
>>
I had this a couple times long ago - had to put the car in gear to
stop the engine.
As I recall, carbon buildup on the valves can cause the deiseling,
aside from why gas is getting in there.
Damned if I can recall what I did to fix it, but carbon deposits
is one thing to look for. A good WOT run or gas additive might
help on that score.
The carbon itself can get there by oil down the guides or ring blowby.

--Vic
 >> Stay informed about: 4.3L run-on