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Eliminate the CEL for EGR flow control valve?  RSS feed
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goglio704

Joined: 31/07/2009 20:55:34
Messages: 8
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I would like to see the tune eliminate the CEL for an unplugged EGR flow control valve. When I'm out of warranty, I would be hard pressed to justify the expense of a valve whose only remaining function without the EGR is to give a soft shutdown.
GreenDieselEngineering
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Joined: 10/07/2009 07:25:47
Messages: 353
Location: Southeast Michigan
With the tune you will still have a CEL if the EGR is unplugged as this would recognize an open circuit. With the tune it is not necessary to unplug the EGR, the system prevents future EGR failures with it plugged in.
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goglio704

Joined: 31/07/2009 20:55:34
Messages: 8
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Speed reading is not your friend. I'm referring to the motorized butterfly valve in the intake that the service manual calls the EGR flow control valve. It helps the EGR do its thing, and with the EGR disabled, its only remaining function is to choke the intake on engine shutdown. Not the actual EGR valve. I know you don't call it the EGR flow control valve, but that is what the service manual calls it. For me anyway, that name stuck. The tune doesn't disable it also does it? If it does, then I see what your getting at.
GreenDieselEngineering
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Joined: 10/07/2009 07:25:47
Messages: 353
Location: Southeast Michigan
Sorry about that, I am used to calling it an intake throttle. Since the EGR is not used with the tune, the intake throttle (EGR flow control valve) will never be used in normal operating conditions. It is not useful to choke the engine other than to drive people mad!

If you unplugged the throttle it will still set a CEL for an open circuit, leaving it plugged in should not set a CEL with the tune. The only time we use the throttle is during engine shutdown to shut off air flow to the cylinders. This reduces shutdown shake and reduces engine mount excursion to increase the useful life of the mounts.

If your throttle is broken (the internal gears are plastic and tend to break on the early builds), we can do a special tune to shut off the diagnostics if you do not want to purchase a new valve, but it may not even be necessary...not fully confident the diagnostics look at the throttle function during shutdown. If you purchase the tune and the intake throttle still causes a CEL, we can adjust your tune for free.
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goglio704

Joined: 31/07/2009 20:55:34
Messages: 8
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That sounds good. I hadn't thought about the soft shutdown being easier on the engine mounts. I'm sure they get a workout anyway. If the later valves are more reliable, maybe it is worth having after all. Thanks for the info.
flman
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Joined: 28/08/2009 19:59:32
Messages: 74
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GreenDieselEngineering wrote:Sorry about that, I am used to calling it an intake throttle. Since the EGR is not used with the tune, the intake throttle (EGR flow control valve) will never be used in normal operating conditions. It is not useful to choke the engine other than to drive people mad!



So, what you are saying is that the anti shudder valve is still enabled and the EGR is never enabled?

Still Burnin Oil since 1992!
2010 John Deere 2305 3 cylinder Yanmar
GDE HOT!! Tuned 2006 CRD LTD Silver, Euro TC, GDE Tuned TCM, B&M Trans drain kit
GDE ECO Tuned 2006 CRD Sport Black, B&M Trans drain kit, Front and rear hooks, Full Skids
GDE ECO Tuned 2005 MB 2500 Sprinter Van
2010 MB 2500 Sprinter Van
GreenDieselEngineering
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Joined: 10/07/2009 07:25:47
Messages: 353
Location: Southeast Michigan
What is the "anti-shudder valve"?

The EGR is not actuated in normal driving conditions. We will open it for about a half second on a very fast tip out of the throttle after a hard acceleration to help bleed pressure off the intake side and reduce forces on the turbo. This has given rise to customers worrying that if the EGR valve is plugged there may be other issues long term. We also have a complementary feature for the fast tip out situation. We open the turbo vanes, which reduces the tubine speed of the turbocharger and pumping losses through the turbo. This also reduces the stress on the rotating components inside the turbo. In any case, there is not reason to spend money to fix a failed EGR valve...unless it has failed open. If it fails open you will have clouds of black smoke during an acceleration from stop and a very noticeable lag.
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flman
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Joined: 28/08/2009 19:59:32
Messages: 74
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On the VW TID it is a butterfly built into the EGR, on when you turn the key off, vacuum closed the butterfly for smooth shut down, and to prevent a run away engine. Does the CRD EGR have this on it?

Still Burnin Oil since 1992!
2010 John Deere 2305 3 cylinder Yanmar
GDE HOT!! Tuned 2006 CRD LTD Silver, Euro TC, GDE Tuned TCM, B&M Trans drain kit
GDE ECO Tuned 2006 CRD Sport Black, B&M Trans drain kit, Front and rear hooks, Full Skids
GDE ECO Tuned 2005 MB 2500 Sprinter Van
2010 MB 2500 Sprinter Van
GreenDieselEngineering
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Joined: 10/07/2009 07:25:47
Messages: 353
Location: Southeast Michigan
Now I get it. There is nothing like that built into the KJ. The VW is an older product design and uses the vacuum butterfly on shutdown. The Jeep has the FCV (intake throttle) that accomplishes the same task, but it is fully electronic and faster. The FCV and EGR valve normally work together to control the flow of fresh air into the engine with a stock configuration. With the ECO tune the EGR is off, but the FCV will still shut on engine shutdown to reduce engine vibration to reduce mount excursion.
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Kapalczynski
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Joined: 21/11/2009 11:25:51
Messages: 1
Location: Colorado Springs, CO - 6000ft above sea level. :)
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Hey everyone!, this is my first post, but I am very excited about the GDE tuning abilities and that they are more than just power hungry and care about the economy and longevity as well. That being said, I have read probably 90% of the posts on here trying to find all the info I can about this tune! I've been looking at the eco/hot tunes and the turbo kit thats coming out soon and I have a couple questions about wether it is safe to unplug my MAF sensor like many ppl suggest:

GreenDieselEngineering wrote:What is the "anti-shudder valve"?

The EGR is not actuated in normal driving conditions. We will open it for about a half second on a very fast tip out of the throttle after a hard acceleration to help bleed pressure off the intake side and reduce forces on the turbo. This has given rise to customers worrying that if the EGR valve is plugged there may be other issues long term. We also have a complementary feature for the fast tip out situation. We open the turbo vanes, which reduces the tubine speed of the turbocharger and pumping losses through the turbo. This also reduces the stress on the rotating components inside the turbo. In any case, there is not reason to spend money to fix a failed EGR valve...unless it has failed open. If it fails open you will have clouds of black smoke during an acceleration from stop and a very noticeable lag.


GDE, Does the factory tune do either of these? "open it for about a half second on a very fast tip out of the throttle after a hard acceleration to help bleed pressure off the intake side and reduce forces on the turbo" or "open the turbo vanes, which reduces the tubine speed of the turbocharger and pumping losses through the turbo"

Since it wil be a bit before I get your tune, I think it would be best to leave it connected would you agree? Obviously after your tune i will leave it connected.

I am seriously considering your tune, but I need to fix a small boost leak I found in my intercooler first ($300.00) and have to wait till march to do so as the only aluminum welder i trust to do so is out of commission with shoulder surgery untill then.

New member, here to learn Have had the CRD for less than a year and looking to correct its known faults (you know what they are...lol)
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GreenDieselEngineering
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Joined: 10/07/2009 07:25:47
Messages: 353
Location: Southeast Michigan
The stock tune does open the turbo vanes in fast tip-out situations to protect the turbo. We modified the stock settings to make the response quicker and to allow the turbo to build boost back to the desired level faster after the tip-out event when the accel pedal is pushed again. It is safe to unplug the MAF sensor and it should slightly improve your fuel economy. The main issue is that your check engine light will always be on and if you have a real problem you will no know and engine damage could occur. We think it best to make sure the CEL is off normally and only comes on when a real problem is present.
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