Cold Air = Rough Idle
#1
#4
#5
already tried
Have replaced IAC, cleaned MAF, replaced small vac hoses, retightned clamps on TB pipe, replaced PCV valve.
In addition I have also called it ugly names and kicked the tires a few times. The latter did not help, but I felt much better afterward.
It's the cold issue that confuses me. I wonder if there could be a crack in somedthing that opens in the cold and closes when warmer.
In addition I have also called it ugly names and kicked the tires a few times. The latter did not help, but I felt much better afterward.
It's the cold issue that confuses me. I wonder if there could be a crack in somedthing that opens in the cold and closes when warmer.
Last edited by dburgjohn; 01-30-2010 at 06:00 PM.
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#6
#7
Join Date: Dec 1997
Location: Windsor,Ontario,Canada
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A vacuum leak will cause your symptoms. Cold engine, start it and using carb cleaner spray all the vacuum lines and intake manifold joints. When the idle changes you have found the leak. According to the year of your truck you have a composite intake manifold. The odds are that it is leaking where it connects to the heads.
Regards
Jean Marc Chartier
Regards
Jean Marc Chartier
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#8
cold manifold
can a intake manifold leak only show up in very cold weather, then go away when it warms up?
A vacuum leak will cause your symptoms. Cold engine, start it and using carb cleaner spray all the vacuum lines and intake manifold joints. When the idle changes you have found the leak. According to the year of your truck you have a composite intake manifold. The odds are that it is leaking where it connects to the heads.
Regards
Jean Marc Chartier
Regards
Jean Marc Chartier
#10
after the summer
after a summer of running perfect the temps have dropped again and the miss is back. feels like my options are:
A) Someone here gives me a awesome idea of where to look
B) I move to the Gulf Coast
C) I shoot it
hopeing for options A, not sure which of the others I would prefer
A) Someone here gives me a awesome idea of where to look
B) I move to the Gulf Coast
C) I shoot it
hopeing for options A, not sure which of the others I would prefer
The following users liked this post:
#11
after a summer of running perfect the temps have dropped again and the miss is back. feels like my options are:
A) Someone here gives me a awesome idea of where to look
B) I move to the Gulf Coast
C) I shoot it
hopeing for options A, not sure which of the others I would prefer
A) Someone here gives me a awesome idea of where to look
B) I move to the Gulf Coast
C) I shoot it
hopeing for options A, not sure which of the others I would prefer
#12
#14
When the outside air temp drops below 50, the idle bounces from 300 to 700 every one to two seconds. When the temp is above 50 it sits rock solid at around 650. When the outside air temp is around 50, warming the enging up will make the rough idle go away. When the outside air temp drops into the low 40s or 30s, the rough idle is there not matter how long the engine has been running. You have to use both feet at a stop light to keep it from dying. Off idle it runs great not matter what the engine or outside air temp is.
Last edited by dburgjohn; 10-10-2011 at 06:07 PM.