OTP EGR Valve 1993 Jimmy - Off-Road Forums & Discussion Groups
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post #1 of (permalink) Old 06-23-2003, 12:50 AM Thread Starter
 
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OTP EGR Valve 1993 Jimmy

Guys I have posted this in the GMC Forum but I know there are more readers and this is my true home so if you can help Thanks MY Post
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post #2 of (permalink) Old 06-23-2003, 01:43 AM
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Re: OTP EGR Valve 1993 Jimmy

1. Check hose routing (refer to the Vehicle Emission Control Information (VECI) label).
2. Check the EGR valve signal tube orifice for obstructions.
3. Connect a vacuum gauge between EGR valve and carburetor, then check the vacuum; the engine must be at operating temperature of 195F (90C).
4. With the engine running at approximately 3000 rpm there should be at least 5 in. Hg (16 kPa).
5. Check the EGR solenoid for correct operation.
6. To check the valve, perform the following procedures: [*] Depress the valve diaphragm. [*] With the diaphragm still depressed hold a finger over the source tube and release the diaphragm. [*] Check the diaphragm and seat for movement. The valve is good if it takes over 20 seconds for the diaphragm to move to the seated position (valve closed). Make sure the source tube is completely covered.
7. Replace the EGR valve if it takes less than 20 seconds to move to the seated position.



Last edited by LEVE; 03-24-2009 at 07:44 PM.
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post #3 of (permalink) Old 06-23-2003, 11:43 AM Thread Starter
 
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Re: OTP EGR Valve 1993 Jimmy

Leve,
Once again you always have the most complete answers. My problem though is that I have an electric EGR I believe. It sits on the front of the intake underneath the breather hose and looks like no EGR I have ever seen. Would the procedures you listed still apply?
Thanks, FlaCJ
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post #4 of (permalink) Old 06-23-2003, 12:03 PM
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Re: OTP EGR Valve 1993 Jimmy

1. I think so...
2. But I'm not an expert on this one..
3. The saving grace is that it's an EGR,
4. The difference is that it's opened by the ECM at about 42mph.
5. So the darned thing has only two states.. opened and closed.
6. If it opens, and doesn't close... it's a problem.
7. If it doesn't open it may throw a code, but not be a problem.
8. But heck that's the only information I can dig up on this...
9. I'm hoping others can fill in...
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