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 Post subject: Is there any way to tell if my EGR valve is stuck open?
PostPosted: Mon Jun 13, 2016 1:04 pm 
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Would there be any check engine light if it is? I have 06 liberty crd btw. Thanks.


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 Post subject: Re: Is there any way to tell if my EGR valve is stuck open?
PostPosted: Mon Jun 13, 2016 2:19 pm 
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Maybe. Depends on how failed it is. My personal feeling is they are never completely sealed anyway. The CRD should not smoke except at WOT, and if it does, you are leaking boost from somewhere.


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 Post subject: Re: Is there any way to tell if my EGR valve is stuck open?
PostPosted: Mon Jun 13, 2016 2:48 pm 
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You can make a simple block off plate to ensure no leakby. Can be made out of most any lightweight metal such as steel or aluminum. Blocking it off will not set any DTC's (check engine light) as I ran this way for many months before the Weeks elbow kit became available... :wink:
Simply unbolt the exhaust tube on the EGR valve and slip the blockoff plate between the exhaust tube flange and EGR valve and bolt everything back up...

These are the dimensions:
Image

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Last edited by WWDiesel on Sat Jul 15, 2017 10:51 am, edited 1 time in total.

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 Post subject: Is there any way to tell if my EGR valve is stuck open?
PostPosted: Mon Jun 13, 2016 4:37 pm 
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Did you have a green diesel tune? Because I am confused by the lack of a check engine light. The computer is looking for a drop in flow across the mass airflow sensor, when it commands the EGR to be open. If it does not see this change, then it will command the FCV to close. If it still does not see a drop in airflow across the mass there, then it will set the check engine light.

But the tune from GreenDiesel Engineering and some of the cheaper yeti tunes will eliminate the code from the computer.

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 Post subject: Re: Is there any way to tell if my EGR valve is stuck open?
PostPosted: Mon Jun 13, 2016 6:46 pm 
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I don’t know if the EGR valve is stuck open or not. I am just trying to figure out if it is (or not) without taking things apart.


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 Post subject: Re: Is there any way to tell if my EGR valve is stuck open?
PostPosted: Mon Jun 13, 2016 9:19 pm 
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m0sfet wrote:
I don’t know if the EGR valve is stuck open or not. I am just trying to figure out if it is (or not) without taking things apart.

If the EGR is stuck open and you are loosing boost, then you will see abnormal amounts of of black smoke bellowing out the tailpipe when trying to accelerate...it will be real evident.... :wink:

FYI: Geordi and all, I had my EGR blocked off with the block off plate way prior to any tune or other mods and never received any DTC's...

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05 Jeep Liberty CRD Limited :JEEPIN:
Blk Brush Guard/Hella's/LED's
Ironman Springs/Bilstein's
Yeti Stg4 MaxTune
Weeks ElbowKit/Battery Tray
NO FCV/EGR
Samcos/ProVent
SunCoast/Transgo
Carter Intank-pump
2mic.Sec.Fuel Filter
Flowmaster/NOcat
V6 Airbox
GM11 blade fan/Hayden HD clutch
Ironrock Trilink
98 Dodge Cummins, 5"exh. Viair,K&N


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 Post subject: Re: Is there any way to tell if my EGR valve is stuck open?
PostPosted: Mon Jun 13, 2016 9:23 pm 
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The EGR valve is a lot like Schrödinger's cat.
Until you can observe it directly, it exists in both the open and closed state. The only way to know for sure which state it is is to open it up and see.

Now, if it were me and someone presented me with a box that may or may not have a dead cat inside, I'd just toss the whole thing in the trash and forget it ever existed. :wink:

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Replaced cylinder head (cracked) at 160,000 miles + ARP studs
2.5 inch lift, 255-75-17 tires.
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 Post subject: Re: Is there any way to tell if my EGR valve is stuck open?
PostPosted: Tue Jun 14, 2016 2:54 pm 
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Sometimes I had oscillating idle speed (hard to catch as the ECU would compensate to keep stable) and "less power" feeling when accelerating, never noticed black smoke... Jeep runs smoother after installing the EGR block off plate. :mrgreen:

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 Post subject: Re: Is there any way to tell if my EGR valve is stuck open?
PostPosted: Tue Jun 14, 2016 6:48 pm 
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It is not magic here. P0401 is a stuck closed egr valve, P0402 is a stuck open egr valve. You can also check the air flow at idle with an OBD monitoring tool and that will also tell the tale. No real need to remove it to see the functionality if you can monitor the live data across the CAN bus.

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 Post subject: Re: Is there any way to tell if my EGR valve is stuck open?
PostPosted: Mon Jan 01, 2018 8:05 pm 
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My EGR valve is stuck open. Just found out. Got the P0492 code after installing new intake hoses. What can I do now? I need this to drive 20 miles to work and back each day as in tomorrow.


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 Post subject: Re: Is there any way to tell if my EGR valve is stuck open?
PostPosted: Mon Jan 01, 2018 9:10 pm 
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 Post subject: Re: Is there any way to tell if my EGR valve is stuck open?
PostPosted: Mon Jan 01, 2018 10:12 pm 
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Cowgirrl2 wrote:
My EGR valve is stuck open. Just found out. Got the P0492 code after installing new intake hoses. What can I do now? I need this to drive 20 miles to work and back each day as in tomorrow.

You can either replace the egr valve, delete the egr valve, or install a block off plate.

In the meantime, it’s still driveable. You might have some reduced power and black exhaust smoke, but you can still drive it.

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Bought my '05 CRD on June 2nd '07, used with 29,000 miles.
intake elbow and EGR delete. 7 volt Etecno glow plugs
Yeti stage 2 ECU tune. Straight pipe exhaust. DIY intercooler hoses
Provent and modified factory 180F thermostat
Replaced cylinder head (cracked) at 160,000 miles + ARP studs
2.5 inch lift, 255-75-17 tires.
Still love it.


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 Post subject: Re: Is there any way to tell if my EGR valve is stuck open?
PostPosted: Tue Jan 02, 2018 12:40 am 
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flash7210 wrote:
Cowgirrl2 wrote:
My EGR valve is stuck open. Just found out. Got the P0492 code after installing new intake hoses. What can I do now? I need this to drive 20 miles to work and back each day as in tomorrow.

You can either replace the egr valve, delete the egr valve, or install a block off plate.

In the meantime, it’s still driveable. You might have some reduced power and black exhaust smoke, but you can still drive it.


Thank you for the reply. Yeah, I've got the smoke goin'. But it helps a lot to know I'm not causing more problems. I've just put out $$$ for those hoses and was down to -$ for deposit on my own apt. (Perfect timing after the holidays, not.) Thank you, thank you!

P.S. That was Engine Code P0402. Sorry about the typo. Glad you could decipher what I meant.


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 Post subject: Re: Is there any way to tell if my EGR valve is stuck open?
PostPosted: Tue Jan 02, 2018 8:12 am 
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Simple short term solution: install a block-off plate! 30 minute or less job with simple hand tools! :wink:
Here are the dimensions and instructions for making one and installation:> viewtopic.php?f=5&t=76576

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05 Jeep Liberty CRD Limited :JEEPIN:
Blk Brush Guard/Hella's/LED's
Ironman Springs/Bilstein's
Yeti Stg4 MaxTune
Weeks ElbowKit/Battery Tray
NO FCV/EGR
Samcos/ProVent
SunCoast/Transgo
Carter Intank-pump
2mic.Sec.Fuel Filter
Flowmaster/NOcat
V6 Airbox
GM11 blade fan/Hayden HD clutch
Ironrock Trilink
98 Dodge Cummins, 5"exh. Viair,K&N


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 Post subject: Re: Is there any way to tell if my EGR valve is stuck open?
PostPosted: Tue Jan 02, 2018 4:33 pm 
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If you have a few minutes and a cold canned beverage, you have a temporary block off plate already.

The domed bottom of the can is the perfect shape to fit within the EGR tube on the intake elbow. Don't cut it until after you get the marmon clamp off and can see the size - you want it to fit within the circle but not small enough to fall into the tube. Size should be about 1.25" across. Drop it into the end of the tube and reinstall back on the intake elbow.

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Need help? Just ask! I've taken it apart more than most.
Email (button below) is preferred to PM
Over 70 CRDs currently driving with my timing belt, rockers, or ARP Studs.
Just remember: Bad noises = REALLY bad things.


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