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Old 11-14-2010, 03:12 AM   #1
maladosteo35
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Loss of boost if EGR valve is unplugged

I have done a lot of reading on different threads about unplugging the EGR valve as a short/ cheap fix to help prevent problems with recirculating exhaust gases back to the intake. In my '05, i didn't have any CEL show, but I did notice that i was not able to get more than 20lbs of boost from the turbo. I plugged in back in after noticing it, and the next time i stood on it i got over 30lbs. anyone know why? thanks..
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Old 11-14-2010, 04:48 AM   #2
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With certain stradegies and year trucks, unplugging the EGR valve can set the truck into a limp mode. From my understanding, this is a fairly new find. Othe symptoms that may occur is, the VGT not cycling when at idel, and the clutch fan not reaching full RPM.

As far as what year trucks and stradegies are effected, nobody knows. You noticed less boost, myself and another member noticed that the VGT was not cycling. Without putting the truck on a diagnostic scanner, you wouldn't be able to tell if the clutch fan is reaching full RPM. Now I wonder how may guys have there EGR valve unplugged, and don't realize that there clutch fan is not working properly?!?!?!?
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Old 11-14-2010, 04:53 AM   #3
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Just to clear things up, did you unplug the valve when the truck was off?
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Old 11-14-2010, 05:37 AM   #4
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Quote:
Originally Posted by lilpooh View Post
Just to clear things up, did you unplug the valve when the truck was off?
It does not matter when you unplug it. The EGR valve is spring load closed and needs a current to keep it open.


If you not not have any issues, you WILL see lower psi from the system because the system is more efficient with its operations.
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Old 11-14-2010, 06:12 AM   #5
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I have my EGR taken out but still plugged in ( got a spool in the opening for the valve) you will have a lower boost pressure, as some have said it can be because it runs more efficiently, some say because your not adding used, burned, usless air back into your cyl it A) dosent need to push as much air (i would think it would still spool up to 30 then back back down to where it would be most efficent B) others say its because your not adding boosted air flow back into the system from exhaust it wont build as much...

At any rate of repeating, I have been running mine plugged at manifold and connected at harness and laying on top of motor for nearly a year with no ill side affect due to it, still runs great! but holds soft codes in computer.
Even with your egr unplugged it can still leak exhaust gas past the valve from what I have read.
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Old 11-14-2010, 02:01 PM   #6
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I did unplug the EGR with the truck off. I plugged it back in after noticing the boost was limited to 20lbs. I'm not a diesel tech, but it seems that the computer is limiting the boost somehow. For now, i'm leaving it plugged in. I have a bypass coolant filter and a bypass oil filter installed to help prevent the problems with the EGR cooler itself. I have seen EGR delete/ bypass kits for sale from $150-400. are they worth it? thanks
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Old 11-14-2010, 02:02 PM   #7
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Let's remember that boost is a measure of "back pressure", how hard the turbo is pushing air into the engine but NOT a measure of how much clean air is entering the engine!

If the turbo is moving 60#/min of clean air, and the EGR is adding 10# of EGR to the intake, where "boost" is measured, what do you think will happen when you remove that 10#/min of EGR but don't alter anything else? Measured boost will go down but clean airflow did not change.

If you want to know if you are getting more air into your engine, look NOT at boost but at the MAF signal in # of Intake air/minute!
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Old 11-14-2010, 02:07 PM   #8
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Quote:
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Let's remember that boost is a measure of "back pressure", how hard the turbo is pushing air into the engine but NOT a measure of how much clean air is entering the engine!

If the turbo is moving 60#/min of clean air, and the EGR is adding 10# of EGR to the intake, where "boost" is measured, what do you think will happen when you remove that 10#/min of EGR but don't alter anything else? Measured boost will go down but clean airflow did not change.

If you want to know if you are getting more air into your engine, look NOT at boost but at the MAF signal in # of Intake air/minute!
John G, how do you measure the MAF? ok, more important, what is MAF?
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Old 11-14-2010, 03:21 PM   #9
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Quote:
Originally Posted by maladosteo35 View Post
I have done a lot of reading on different threads about unplugging the EGR valve as a short/ cheap fix to help prevent problems with recirculating exhaust gases back to the intake. In my '05, i didn't have any CEL show, but I did notice that i was not able to get more than 20lbs of boost from the turbo. I plugged in back in after noticing it, and the next time i stood on it i got over 30lbs. anyone know why? thanks..
This is what happened on my 05 (no MAF). As John said, boost is a function of backpressure, my truck felt twice as strong at 20lbs as it did at 27lbs. What I did was bolt the valve to the alternator bracket and left it plugged in. No soft codes and boost is normal. My truck doesn't have a MAF so I'm not sure how "MAFFED" truck would react.
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Old 11-14-2010, 03:45 PM   #10
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This is what happened on my 05 (no MAF). As John said, boost is a function of backpressure, my truck felt twice as strong at 20lbs as it did at 27lbs. What I did was bolt the valve to the alternator bracket and left it plugged in. No soft codes and boost is normal. My truck doesn't have a MAF so I'm not sure how "MAFFED" truck would react.
It does feel "stronger" at 20 lbs with the EGR unplugged, but i have no way of quantifying that feeling. I assumed that 27-30 is better than 20....
it may seem strange, but i also notice the transmission shifts differently, tends to wind out more with the EGR plugged in...
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