Rough Idle after "spirited" driving
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From: SoFla
Rough Idle after "spirited" driving
Hey All,
So last night I got on it a couple times coming home from dinner (just a couple WOT from 25-60) and this morning when cranking it up I noticed the engine developed a rough idle. Also, the typical whistle I hear that kicks in a few seconds after startup is not as pronounced as it was. I've done as much reading and searching of the topic as I can but am a bit stumped at this point (i'm also new to the diesel world so theres plenty to learn).
With my scangauge hooked up I checked out the ICV values (which appear to be good .25 before startup .84 at idle) ICP (22% at idle 48% at 3-4k rpms) and FICM Voltage (47.5v consistently).
The truck is a 2004 6.0L Excursion (255k miles, w/ headstuds, EGR delete, 4" exhaust, blue spring mod installed yesterday) with a rev-x in the oil and ford cetane booster at each fill-up. One of the issues that I'm currently battling though is that the last owner bought the truck with all mods already done, so he wasnt knowledgable as to what is done. There's definitely a tune on the truck as well (seen boost upwards of 38lb), but no tuner with the truck (something I also have to address).
Here's a video of startup if it helps
So last night I got on it a couple times coming home from dinner (just a couple WOT from 25-60) and this morning when cranking it up I noticed the engine developed a rough idle. Also, the typical whistle I hear that kicks in a few seconds after startup is not as pronounced as it was. I've done as much reading and searching of the topic as I can but am a bit stumped at this point (i'm also new to the diesel world so theres plenty to learn).
With my scangauge hooked up I checked out the ICV values (which appear to be good .25 before startup .84 at idle) ICP (22% at idle 48% at 3-4k rpms) and FICM Voltage (47.5v consistently).
The truck is a 2004 6.0L Excursion (255k miles, w/ headstuds, EGR delete, 4" exhaust, blue spring mod installed yesterday) with a rev-x in the oil and ford cetane booster at each fill-up. One of the issues that I'm currently battling though is that the last owner bought the truck with all mods already done, so he wasnt knowledgable as to what is done. There's definitely a tune on the truck as well (seen boost upwards of 38lb), but no tuner with the truck (something I also have to address).
Here's a video of startup if it helps
More Turbo
Joined: May 2015
Posts: 670
Likes: 13
From: Nampa, ID
It sounds to me like you have a cylinder that is a little low on compression. Cranking should be smooth without any skips. I have heard much morse though. The idle isnt allcthat bad either, especially considering the lack of significant smoke. I think this is more if a low compreesion than no compression issue, not that it means much in terms of the solution for it.
I would do a compression test before anything else.
38lbs of boost is quite a bit if the turbo and injectors are stock. That must be a pretty hot tune loaded. I ran SRL+, which is a fairly hot tune, and only hit 31psi at most.
I would do a compression test before anything else.
38lbs of boost is quite a bit if the turbo and injectors are stock. That must be a pretty hot tune loaded. I ran SRL+, which is a fairly hot tune, and only hit 31psi at most.
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bestrada11
1999 - 2003 7.3L Power Stroke Diesel
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Aug 16, 2014 02:10 AM
