A week ago at 15k miles the gears on my flow control valve stripped and started making a loud racket. They have since gotten almost silent. I removed the hose and found the butterfly is free and spring loaded to the open position and I do't have a cel. Now since he FCV is not closing does that cut down on the egr gas going into the engine? If so this is something I might want to leave broken I really thought I would get a cel but have not yet.

Joe

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Atlantic Blue 06 CRD Limited (his)
Joined by a 2000 XJ Classic (hers)

it wont make a difference in the EGR, just leave, it(unless you want the dealer to fix it) now that it's finsihed stripping out it will just stay in the open position and never cause a CEL.

the only difference you will notice is a slight shudder at shutdown, the last fire will rock the vehicle a little more.

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http://www.Colorado4Wheel.com
"Its not about what you can DO with your Jeep, its about where you can GO with your Jeep."
Knowledgeable - But Caustic

I'm surprised you don't get a CEL, as without the valve operating, the EGR system may not be able to generate enough lower pressure to suck in exhaust gas over the boosted intake. In other words, the system shouldn't see a decrease in the MAF with an increase in EGR/FCV activation. That will set off a CEL with a bad SEGR, as shown by the 1.2 version with the defective PCB.

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'05 Liberty CRD B100, SEGR - SOLD

'01 Beetle TDi B100, EGR delete
'83 Mercedes 240D B100, no EGR

--- SEGR Builder ---

Those are my thoughts. I do notice the shutter on shutdown, no big deal thgere

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Atlantic Blue 06 CRD Limited (his)
Joined by a 2000 XJ Classic (hers)

Almost 25k miles on a bad FCV and no CEL yet.

the FCV is like the appendix of the CRD, heck the earlier versions dont even have it.

Also, I think a failed FCV can only net you better MPG since there is no longer a big restrictor plate up there.

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http://www.Colorado4Wheel.com
"Its not about what you can DO with your Jeep, its about where you can GO with your Jeep."
Knowledgeable - But Caustic

Nope. Had no CEL for 9 months now with the butterfly removed from the FCV.

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05 CRD Renegade

The pressure of the exhaust gasses must be higher than the intake pressure, otherwise the turbo will not spin.

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L.O.S.T forever!
Silver 2002 Skoda Fabia TDI, 235,000km
Former car: Jeep KJ 2003 CRD

DIESEL - saving millions of liters of petrol every day!

That's not entirely true. There is mechanical advantage, one way or the other, depending on the aspect ratio of the scrolls. But the variable nature of the CRD turbo will probably allow it to generate enough back pressure to overcome the intake pressure and flow exhaust into it without the FCV. The FCV may enable it to work more "efficiently", but I suspect EGR must still operate with a defective FCV.

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'05 Liberty CRD B100, SEGR - SOLD

'01 Beetle TDi B100, EGR delete
'83 Mercedes 240D B100, no EGR

--- SEGR Builder ---

If you mean you need EGR...Nope again. I have the EGR blocked and the FCV inoperative with the butterfly removed...runs just like the old rattlers. The FCV closes slightly to allow the venturi effect to happen and pull the exhaust gases into the intake elbow...IMHO.

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05 CRD Renegade

No, all I meant is the EGR will probably still function with just a defective FCV, just not as designed.

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'05 Liberty CRD B100, SEGR - SOLD

'01 Beetle TDi B100, EGR delete
'83 Mercedes 240D B100, no EGR

--- SEGR Builder ---

Yes, agree on that. The FCV creates the pressure drop.

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05 CRD Renegade

So it would seem I'm getting reduced egr gas flow and that is good AND there's a non invasive way to avoid intake clogging

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Atlantic Blue 06 CRD Limited (his)
Joined by a 2000 XJ Classic (hers)