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#1
10-07-2008, 09:33 PM
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Help With EGR!!
Ok, every few months it seems like, my check engine light pops up a P0401 - EGR flow insufficient. I took it in and they replaced the EGR twice in a two month period an also replaced a few hoses (if memory serves...). I'm really curious as to why this thing goes away, but then comes back so sparsely? Anyone have any suggestions/ideas???
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  2000 Pontiac Grand Prix GTP 3.8L SII V6 S/C 2000 Jeep Grand Cherokee Limited 4.7L V8 ---------------------------------------------------- 1996 Chevrolet Camaro Z28 5.7L V8 1993 Chevrolet Suburban K1500 5.7L V8 1991 Ford Probe LX 3.0 V6 1986 Ford Tempo GL 2.3L 4 cyl. 
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#2
10-07-2008, 10:01 PM
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Re: Help With EGR!!
The PCM module uses engine vacuum via the MAP sensor to test EGR flow when the test is called upon during a drive cycle. So check all the vacuum lines at the MAP sensor and back to the throttle body and supercharger. The MAP sensor can be tested to see if the output is correct. Also, a bad PCV valve can cause the EGR flow test to fail. Which includes missing any seals like the PCV o-ring.
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'08 Pontiac Grand Prix GXP (Dark Slate Metallic) - LS4 5.3L V8 '02 Oldsmobile Alero GL2 - LA1 3400 V6 '99 Buick Regal LS - L36 Series II 3800 V6 '03 Honda CR250R MX - 2 Stroke 250cc '97 Pontiac Grand Prix GTP - L67 Series II 3800 V6 Supercharged (Sold) Timeslip 08/12/06 AF Community Guidelines
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#3
10-07-2008, 10:32 PM
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Re: Help With EGR!!
Correct me if I am wrong, but would not that code also pop up if the gas cap were not sealing correctly too?
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#4
10-07-2008, 10:38 PM
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Re: Help With EGR!!
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'08 Pontiac Grand Prix GXP (Dark Slate Metallic) - LS4 5.3L V8 '02 Oldsmobile Alero GL2 - LA1 3400 V6 '99 Buick Regal LS - L36 Series II 3800 V6 '03 Honda CR250R MX - 2 Stroke 250cc '97 Pontiac Grand Prix GTP - L67 Series II 3800 V6 Supercharged (Sold) Timeslip 08/12/06 AF Community Guidelines
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#5
10-08-2008, 06:50 AM
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Re: Help With EGR!!
Quote:
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#6
10-09-2008, 09:28 AM
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Re: Help With EGR!!
I agree with Bob that it's most likely a vacuum issue. It's rare that this code is indicating an actual problem with the EGR valve itself. Re-check the lower black o-ring on the PCV valve to be sure it's still there and intact.
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 Still waiting for the "good old days" I'll get to bore my future grandchildren with!
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