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trucks idles up and down a little

28K views 11 replies 8 participants last post by  dentexpowerstroke 
#1 ·
fresh oil
fresh fuel filter
new water/fuel separater
new injectors
new icp
new value cover gaskets
truck seems a little sluges when cold and idles up and down a little?
 
#2 ·
How much is a little?
Mine does it too. Combo of worn out HPOP, cold oil, the the #6 injector depleting the oil rail right before the #8 injector fires leaving it without the oil it needs. If you monitored your ICP pressures at idle, you'd see it fluctuate.
Don't worry.
I had a HPOXover hose and it smoothed it out a lot. I'm going to go to a hard line this time (had one crimp fitting crack and one blow) and the Sinister Diesel one looks best to me.
 
#5 ·
Replaced my ICP sensor today since it had oil on the plug and it smoothed out the idle. Doesn't go up and down 100-200 rpm's anymore.
 
#6 ·
Make sure your a/c compressor ain't clicking on and off
 
#10 ·
Is there a reason the replacement ICP sensor is different than the stock one I pulled from the engine? I had to use an adjustable wrench to put the new one on...
 
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