EGR Valve leaking?

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Nov 12, 2002 | 02:39 PM

корвет

Thread Starter

Burning Brakes

Joined: Oct 2000

Posts: 787

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EGR Valve leaking?

I've had a slightly rough idle for awhile. I now get code 32. I took the egr valve off and the diaphram appears to work well. However, when the valve is closed, it does not seal completely. Should it?

Can I take it apart to clean it? What the best method to clean? I suspect carbon build up.

Thanks

Nov 12, 2002 | 03:02 PM

ittlfly

Safety Car

Joined: Feb 2002

Posts: 4,212

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From: Sun City West Az

Re: EGR Valve leaking? (cOvette)

Connect a vacuum guage to the EGR. If it hold 10"hg for 20 sec. the valve should be ok.

Nov 12, 2002 | 03:48 PM

65Z01

Team Owner

Joined: Dec 2000

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From: SE NY

Cruise-In II Veteran

Re: EGR Valve leaking? (cOvette)

The EGR should seal so that no exhaust gas flows, otherwise the EGR Temp. Switch atop the EGR tube will close and the ECM will throw a code.

I've not cleaned one, only replaced it. You could try carb cleaner.

I have a method on my site to test the EGR system components.

Nov 12, 2002 | 05:26 PM

Lone Ranger

Le Mans Master

Joined: Feb 2002

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Re: EGR Valve leaking? (cOvette)

I used throttle body cleaner and q-tips to clean mine, until the tb cleaner would pool in the cavity w/the valve's pintle closed, with negligible leak down thus indicating the pintle was sealing pretty well. A new one is about $44 from Jeff Kopp @ 1-800-728-8267 (Superior Chevrolet)

[Modified by Lone Ranger, 4:27 PM 11/12/2002]

Nov 13, 2002 | 07:13 PM

корвет

Thread Starter

Burning Brakes

Joined: Oct 2000

Posts: 787

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Re: EGR Valve leaking? (Lone Ranger)

Well, for reference it will come appart. I clamped the round thing surrounding the pintle and screwed it out. It is now soaking in Carb cleaner.

I'll save that $44-$70 yet!

Nov 14, 2002 | 04:37 AM

CentralCoaster

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Joined: May 2002

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From: San Diego , CA Double Yellow DirtBags 1985..Z51..6-speed

Re: EGR Valve leaking? (cOvette)

Quote:

Well, for reference it will come appart. I clamped the round thing surrounding the pintle and screwed it out. It is now soaking in Carb cleaner.

I'll save that $44-$70 yet!

The manual specifically says not to expose the diaphragm to harsh solvents. Oh well, this is how I cleaned mine, despite reading that. $70 seems like a steep price to pay for a stupid little valve.

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