Yet another EGR issue ?
Thread Starter
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Senior User
Joined: Mar 2014
Posts: 152
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From: Indianapolis, IN
Yet another EGR issue ?
my early '03 6.0
from 0mph, wot = accel sluggish to 2800rpm (hovers there), will not upshift, scangauge bst max'd at 4.0.
back off throttle = upshifts --- then ease more throttle to 40mph = pretty much normal accel, 18+ bst
egr data:
egr duty cycle% = varies -- idle = 15, cruise = 25
egr valve position desired% = erratic, 0-12
egr valve position measured% = 0 at all times
removed egr valve - covered with soot, no carbon build-up
clean with carb cleaner or soapy water??
how to test, to determine not frozen in closed position??
from 0mph, wot = accel sluggish to 2800rpm (hovers there), will not upshift, scangauge bst max'd at 4.0.
back off throttle = upshifts --- then ease more throttle to 40mph = pretty much normal accel, 18+ bst
egr data:
egr duty cycle% = varies -- idle = 15, cruise = 25
egr valve position desired% = erratic, 0-12
egr valve position measured% = 0 at all times
removed egr valve - covered with soot, no carbon build-up
clean with carb cleaner or soapy water??
how to test, to determine not frozen in closed position??
Posting Guru
Joined: Nov 2012
Posts: 2,123
Likes: 5
Since you read the thread you may have noticed the lack of information available.
Mainly because there is none to be had. Proprietary information.
Even if it was available to us there is nothing we could do with it unless we rewrote the PCM programming.
There is no adjustment or tweaking we can do. It is all controlled within the PCM programing.
All the egr does is open and close to allow spent gas [no oxygen] into the intake to control the air mix to control the combustion temps to stop the formation of Nox.
When it opens for how much and how long it opens is determined entirely by the PCM.
All we can do is keep it cleaned so it can work as commanded or replace it when it no longer works.
I have spent over an hour looking at DTC codes looking for values, lots of codes but not a single actual value. Oh some say the code is thrown if something exceeds a time limit but not what the limit was or inversely if it did not reach a certain point..Still no actual value..
Five pages of google search and nothing.
Not much help I know but the there is not much you can do either.
Mainly because there is none to be had. Proprietary information.
Even if it was available to us there is nothing we could do with it unless we rewrote the PCM programming.
There is no adjustment or tweaking we can do. It is all controlled within the PCM programing.
All the egr does is open and close to allow spent gas [no oxygen] into the intake to control the air mix to control the combustion temps to stop the formation of Nox.
When it opens for how much and how long it opens is determined entirely by the PCM.
All we can do is keep it cleaned so it can work as commanded or replace it when it no longer works.
I have spent over an hour looking at DTC codes looking for values, lots of codes but not a single actual value. Oh some say the code is thrown if something exceeds a time limit but not what the limit was or inversely if it did not reach a certain point..Still no actual value..
Five pages of google search and nothing.
Not much help I know but the there is not much you can do either.
Thread Starter
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Senior User
Joined: Mar 2014
Posts: 152
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From: Indianapolis, IN
I'm not totally convinced my intermittent low power/low boost issue IS the EGR valve. I've even seen suggestions to just unplug it (which leaves it in the Closed position).
I've also seen a youtube video about a plugged MAP hose nipple (mine is clear) causing an issue exactly like mine.
Seems like a variety of conditions will tell the Turbo to take a "time out".
I probably need to connect truck to a "Big Boy" diagnostic machine, as my el-cheapo ScanGaugeII monitor leaves many questions unanswered.
I've also seen a youtube video about a plugged MAP hose nipple (mine is clear) causing an issue exactly like mine.
Seems like a variety of conditions will tell the Turbo to take a "time out".
I probably need to connect truck to a "Big Boy" diagnostic machine, as my el-cheapo ScanGaugeII monitor leaves many questions unanswered.
Posting Guru
Joined: Nov 2012
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A IDS would be the best source available. Did you also check your EBP sensor if the tube was clear?
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Cargo Master
Joined: Jun 2007
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From: Roseburg, OR
By programming EVD and EVM in my scangauge, I was able to diagnose a bad valve. The measured value didn't follow the desired very well.
If you unplug the EGR valve and the truck runs better, you found your problem.
So, what I have noticed with EGR operation is, It starts opening when the EOT/ECT are around 180°. After the initial open, it seems like it opens and closes with the throttle position and after a couple minutes of idling, it closes.
If you unplug the EGR valve and the truck runs better, you found your problem.
So, what I have noticed with EGR operation is, It starts opening when the EOT/ECT are around 180°. After the initial open, it seems like it opens and closes with the throttle position and after a couple minutes of idling, it closes.
Thread Starter
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Senior User
Joined: Mar 2014
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From: Indianapolis, IN
EBP sensor if the tube was clear?
Haven't checked yet
ICP pressure and IPR % at idle?
800 26
soapy water in the little holes...
No, did not wet the solenoid or wiring connector area
unplug the EGR valve...
Results not consistent - sometimes would run normal 2-3 wot runs After disconnecting. At this point, 4-5 wot runs tested good.
Reconnect = more bad than good. Thought this was it !! .....however....
Disconnect = bad again ! ! ! ???
Only consistent is: runs normal, good boost as long as throttle not wide open.
1/2 - 3/4 pedal = slower to accel & build boost, but it will do both.
Haven't checked yet
ICP pressure and IPR % at idle?
800 26
soapy water in the little holes...
No, did not wet the solenoid or wiring connector area
unplug the EGR valve...
Results not consistent - sometimes would run normal 2-3 wot runs After disconnecting. At this point, 4-5 wot runs tested good.
Reconnect = more bad than good. Thought this was it !! .....however....
Disconnect = bad again ! ! ! ???
Only consistent is: runs normal, good boost as long as throttle not wide open.
1/2 - 3/4 pedal = slower to accel & build boost, but it will do both.
Posting Guru
Joined: Nov 2012
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Now we need to see what is happening at the time of the event when it doesn't work and compare against what happens when it does run/accelerate etc.
Possibly need to add app values. See if there is a dead spot of the potentiometers.
App will show 3 values any 2 have to agree within 2 points/vlt. to work properly.
Possibly need to add app values. See if there is a dead spot of the potentiometers.
App will show 3 values any 2 have to agree within 2 points/vlt. to work properly.
Thread Starter
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Senior User
Joined: Mar 2014
Posts: 152
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From: Indianapolis, IN
My APP (accel position %) reads 0 @ idle - varies, up to at least 90 upon accel.
Runs pretty much OK if I keep it under 75%.
(I don't have SG-II codes for vlt)
Runs pretty much OK if I keep it under 75%.
(I don't have SG-II codes for vlt)
Last edited by 11jjonn; Dec 8, 2014 at 01:27 PM. Reason: add info