Idle gets a lil ruffer when Truck is warmed up...

[BraveHeartCalif]

Idle gets a lil ruffer when Truck is warmed up...

So when i turn on the Excursion it idles nice and super smooth. Then when i notice the motor get to normal engine operating temps. The smooth idle is gone and it vibrates more. Anyone have any idea what this could be?

[sixgunsam]

Wow, came on here to ask the same question

[GotDiesel85]

7.3 is known to idle rough. make sure oil isnt low. hpx from riffraff will quiet it down some and make it smoother

[BraveHeartCalif]

I have a FRX on mine not the hpx and i havent noticed it making any differance in vibration. But there is a reason it vibrates more when the engine is at normal temps as compared to when its cold. Somehow heat is culprit and the PCM might be making some sort of adjustment via a sensor or something is one theory. Would a fuelab fuel pump help not sure on the fuel. Is it oil related i dont know. Ill see if i contact my Ford Mech and ask him what he thinks.

Originally Posted by GotDiesel85

7.3 is known to idle rough. make sure oil isnt low. hpx from riffraff will quiet it down some and make it smoother

[GotDiesel85]

Originally Posted by BraveHeartCalif

I have a FRX on mine not the hpx and i havent noticed it making any differance in vibration. But there is a reason it vibrates more when the engine is at normal temps as compared to when its cold. Somehow heat is culprit and the PCM might be making some sort of adjustment via a sensor or something is one theory. Would a fuelab fuel pump help not sure on the fuel. Is it oil related i dont know. Ill see if i contact my Ford Mech and ask him what he thinks.

oil and fuel in a powerstroke are directly related, sorry to say. HPx equals out the pressure between the heads so you have less spikes in pressure. if pressure is equlized with no spikes to any injector fuel flows better hence smoother idle

[taylorking]

Pull the ICP sensor and check for oil in the connector

[BraveHeartCalif]

ill be doing to icp on monday becuz everything else checked out ok..

[NITMARE]

I had a truck doing this exact same thing and switching to a heavier oil alleviated the problem....which turned out to be the case because as the oil warmed up it flowed easier and dropped the HPOP pressure. This turned out to be the first symptom of an HPOP that was getting weak.

[Jarrod B]

Originally Posted by NITMARE

I had a truck doing this exact same thing and switching to a heavier oil alleviated the problem....which turned out to be the case because as the oil warmed up it flowed easier and dropped the HPOP pressure. This turned out to be the first symptom of an HPOP that was getting weak.

thanks. was about to mention something like that. mine idled ruff and died and is now being rebuilt.

[nation]

i replaced the cps and installed a rrd hpx,seems to have solved my running rough issue. just be careful using words like riffraff on here,mods take it personal.