Question for the Gurus!!
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Question for the Gurus!!
I recently began to experience some troubles with my 03 6.0L. Last week the truck began to idle poorly and shake and shudder (like the engine is missing). The problem has persisted and gotten a little worse. Additionally, the truck shakes, vibrates, and shudders at speeds below 65mph. The only way to get the shaking to quit under 65 mph is to really lay down on the go pedal. Also, I unplugged the EGR and ran out for a test drive and felt no difference. The kicker to all of this is the fact that the truck runs normally when cold, but once warmed up (20 minutes or so) it really starts to shake. I have also noticed that my fuel economy and power are severely out of whack. I changed the fuel filters and drained at the lower valve on the frame rail.
NO Check Engine Light
NO Codes stored when scanned
NO Smoke
The truck has 120k on it and has been problem free until now.
Any input would be appreciated.
Thanks
NO Check Engine Light
NO Codes stored when scanned
NO Smoke
The truck has 120k on it and has been problem free until now.
Any input would be appreciated.
Thanks
Postmaster
Joined: Dec 2003
Posts: 4,196
Likes: 10
From: Arizona
Originally Posted by bhill2625
I recently began to experience some troubles with my 03 6.0L. Last week the truck began to idle poorly and shake and shudder (like the engine is missing). The problem has persisted and gotten a little worse. Additionally, the truck shakes, vibrates, and shudders at speeds below 65mph. The only way to get the shaking to quit under 65 mph is to really lay down on the go pedal. Also, I unplugged the EGR and ran out for a test drive and felt no difference. The kicker to all of this is the fact that the truck runs normally when cold, but once warmed up (20 minutes or so) it really starts to shake. I have also noticed that my fuel economy and power are severely out of whack. I changed the fuel filters and drained at the lower valve on the frame rail.
NO Check Engine Light
NO Codes stored when scanned
NO Smoke
The truck has 120k on it and has been problem free until now.
Any input would be appreciated.
Thanks
NO Check Engine Light
NO Codes stored when scanned
NO Smoke
The truck has 120k on it and has been problem free until now.
Any input would be appreciated.
Thanks
Possible HPOP leak or bad EP sensor. Did you have the 06E17 recall performed that took the EP sensor out of the PCM strategy to control the turbo?
I am leaning toward a HPOP problem since it does it when warm and not cold.
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Thanks for the reply Blackhat!! If 06E17 is the one that cycles the injectors after shutdown, then yes. If 06E17 was released after the infamous injector cycling flash, then no.
Also, I meant to add that when I drained the lower fuel filter plug, I found alot more trash in the drained fuel than I expected (thats what I get for filling up at mom&pop). The reason I'm adding this information is that I am concerned with fuel pressure (or lack there of). Is there a down and dirty way of checking fuel pressure without heading to the dealer?
Sorry for the rambling.
Thanks
Also, I meant to add that when I drained the lower fuel filter plug, I found alot more trash in the drained fuel than I expected (thats what I get for filling up at mom&pop). The reason I'm adding this information is that I am concerned with fuel pressure (or lack there of). Is there a down and dirty way of checking fuel pressure without heading to the dealer?
Sorry for the rambling.
Thanks
Postmaster
Joined: Dec 2003
Posts: 4,196
Likes: 10
From: Arizona
Originally Posted by bhill2625
Thanks for the reply Blackhat!! If 06E17 is the one that cycles the injectors after shutdown, then yes. If 06E17 was released after the infamous injector cycling flash, then no.
Also, I meant to add that when I drained the lower fuel filter plug, I found alot more trash in the drained fuel than I expected (thats what I get for filling up at mom&pop). The reason I'm adding this information is that I am concerned with fuel pressure (or lack there of). Is there a down and dirty way of checking fuel pressure without heading to the dealer?
Sorry for the rambling.
Thanks
Also, I meant to add that when I drained the lower fuel filter plug, I found alot more trash in the drained fuel than I expected (thats what I get for filling up at mom&pop). The reason I'm adding this information is that I am concerned with fuel pressure (or lack there of). Is there a down and dirty way of checking fuel pressure without heading to the dealer?
Sorry for the rambling.
Thanks
Only way to measure fuel pressure is to remove the test port plug on the secondary fuel filter housing and install a gauge and read it. Below 40Psi under load is a problem. If it is below 40Psi at idle it is even worse.
The threads on the fuel test port are M12 X 1.5.
Elder User
Joined: Jul 2005
Posts: 716
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From: memphis
Originally Posted by bhill2625
The reason I'm adding this information is that I am concerned with fuel pressure (or lack there of). Is there a down and dirty way of checking fuel pressure without heading to the dealer?
Thanks
Thanks
I have had good luck by pulling the guage and turn the key to let the pump
push trash water out the upper test port/line. My guage will start to bounce
before the WIF light comes on. A quick flush has steady it twice.
I use international fuel filters and I have had water in the upper housing.
There are no high volume Diesel stations along my normal route, I tried the regular gas station. NOT Anymore.
Post Fiend
Joined: Apr 2004
Posts: 19,098
Likes: 8
From: Great State of Texas
Originally Posted by bhill2625
I recently began to experience some troubles with my 03 6.0L. Last week the truck began to idle poorly and shake and shudder (like the engine is missing). The problem has persisted and gotten a little worse. Additionally, the truck shakes, vibrates, and shudders at speeds below 65mph. The only way to get the shaking to quit under 65 mph is to really lay down on the go pedal. Also, I unplugged the EGR and ran out for a test drive and felt no difference. The kicker to all of this is the fact that the truck runs normally when cold, but once warmed up (20 minutes or so) it really starts to shake. I have also noticed that my fuel economy and power are severely out of whack. I changed the fuel filters and drained at the lower valve on the frame rail.
NO Check Engine Light
NO Codes stored when scanned
NO Smoke
The truck has 120k on it and has been problem free until now.
Any input would be appreciated.
Thanks
NO Check Engine Light
NO Codes stored when scanned
NO Smoke
The truck has 120k on it and has been problem free until now.
Any input would be appreciated.
Thanks
Thread Starter
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New User
Joined: Jul 2007
Posts: 10
Likes: 0
Blackhat - I dont think I have that flash running on mine. I guess I will have the dealer give it a go. Last time I requested an updated flash from the dealer, they wanted to charge me one hour of labor. Is that right?
Hott-Rodd - Thanks for the info, I will give it a try.
KW54133 - Oil has not been changed recently.
I guess I will get the updated flash and go from there. Maybe check the fuel pressure next. If my problem has anything to do with the HPOP, is there any way to test / diagnose?
Thanks for all of the replies and keep 'em coming.
Hott-Rodd - Thanks for the info, I will give it a try.
KW54133 - Oil has not been changed recently.
I guess I will get the updated flash and go from there. Maybe check the fuel pressure next. If my problem has anything to do with the HPOP, is there any way to test / diagnose?
Thanks for all of the replies and keep 'em coming.
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Postmaster
Joined: Sep 2005
Posts: 2,725
Likes: 3
From: Florence,SC
man!! these guys have been paying attention. 
there is only so much you can do without a scan tool on these trucks. if it is the hpop, then it will need a scan tool to diagnose. if its running, i dont belive it is the pump. i would recomend taking the truck the truck to your dealer and getting the lastest flash done because i have seen this flash solve many issues within skipping even when hot. check your fuel pressure if possible and start there. if the pressure is fine, go get the reflash, and we will go from there.
there is only so much you can do without a scan tool on these trucks. if it is the hpop, then it will need a scan tool to diagnose. if its running, i dont belive it is the pump. i would recomend taking the truck the truck to your dealer and getting the lastest flash done because i have seen this flash solve many issues within skipping even when hot. check your fuel pressure if possible and start there. if the pressure is fine, go get the reflash, and we will go from there.
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Postmaster
Joined: Dec 2003
Posts: 4,196
Likes: 10
From: Arizona
Originally Posted by bhill2625
Blackhat - I dont think I have that flash running on mine. I guess I will have the dealer give it a go. Last time I requested an updated flash from the dealer, they wanted to charge me one hour of labor. Is that right?
Posting Guru
Joined: Mar 2006
Posts: 1,798
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From: SoCal, SD CO. East
Originally Posted by blackhat620
Yep that sounds about right, they are going to have a minimum shop charge, and you are pasted the 5/100K warranty.
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OK ... I ran a pressure test on the fuel system and got 55psi at idle when warm. Im no tech, but that sounds a little on the high side. I wonder if the gauge is bad?
I found a local dealer that agreed to flash the PCM on Friday (no charge).
Any ideas from here?
Thanks in advance.
I found a local dealer that agreed to flash the PCM on Friday (no charge).
Any ideas from here?
Thanks in advance.
Thread Starter
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New User
Joined: Jul 2007
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Originally Posted by BowTieHatr
man!! these guys have been paying attention. there is only so much you can do without a scan tool on these trucks. if it is the hpop, then it will need a scan tool to diagnose. if its running, i dont belive it is the pump. i would recomend taking the truck the truck to your dealer and getting the lastest flash done because i have seen this flash solve many issues within skipping even when hot. check your fuel pressure if possible and start there. if the pressure is fine, go get the reflash, and we will go from there.
there is only so much you can do without a scan tool on these trucks. if it is the hpop, then it will need a scan tool to diagnose. if its running, i dont belive it is the pump. i would recomend taking the truck the truck to your dealer and getting the lastest flash done because i have seen this flash solve many issues within skipping even when hot. check your fuel pressure if possible and start there. if the pressure is fine, go get the reflash, and we will go from there.Alright ... Here's the latest:
I changed my oil two days ago and now I have the cold start problem (no power until warm / engine bucking / etc etc etc). I still have the issues previously mentioned along with this new one.
PCM up to date ... Check
New fuel and oil filters ... Check
Drained water seperator ... Check
New clean engine oil ... Check
Fuel additive ... Check
Fuel pressure OK at idle (55 psi) ... Check
I havent checked the fuel pressure while under load because I get 55 psi while the engine is running rough at idle.
Where should I go from here? I guess a full diagnostic from the dealer may be in order, but I still dont trust the local diesel talent.
Thanks again to all who have helped!!
Senior User
Joined: Aug 2004
Posts: 215
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From: Bakersfield California
My truck under another post dies under load...or wont run up with gas peddle depressed....Is HPOP high Pressure oil pump? Also not sure if this flash would relate to my problem....Truck just wont move but idles ok....I dont hear the fuel pump ticking when I turn the key on engine off...and I saw you guys mentioned HPOP probably not an issue if it runs. I cant see 1 o ring killing the whole truck...You'de still have 7 good wouldnt you? I'll update you in your post if I figure out mine maybe it'll help...
Postmaster
Joined: Dec 2003
Posts: 4,196
Likes: 10
From: Arizona
Originally Posted by bhill2625
Alright ... Here's the latest:
I changed my oil two days ago and now I have the cold start problem (no power until warm / engine bucking / etc etc etc). I still have the issues previously mentioned along with this new one.
PCM up to date ... Check
New fuel and oil filters ... Check
Drained water seperator ... Check
New clean engine oil ... Check
Fuel additive ... Check
Fuel pressure OK at idle (55 psi) ... Check
I havent checked the fuel pressure while under load because I get 55 psi while the engine is running rough at idle.
Where should I go from here? I guess a full diagnostic from the dealer may be in order, but I still dont trust the local diesel talent.
Thanks again to all who have helped!!
I changed my oil two days ago and now I have the cold start problem (no power until warm / engine bucking / etc etc etc). I still have the issues previously mentioned along with this new one.
PCM up to date ... Check
New fuel and oil filters ... Check
Drained water seperator ... Check
New clean engine oil ... Check
Fuel additive ... Check
Fuel pressure OK at idle (55 psi) ... Check
I havent checked the fuel pressure while under load because I get 55 psi while the engine is running rough at idle.
Where should I go from here? I guess a full diagnostic from the dealer may be in order, but I still dont trust the local diesel talent.
Thanks again to all who have helped!!
Your issue could be a bad injector(s), ICP sensor, FICM problem, HPOP problem, EGR problem, MAP senosor, Baro Sensor etc.