Po400 ????????????

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Aug 5, 2005 | 01:42 PM

audible

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From: Temecula CA

Po400 ????????????

I get a PO400 code (EGR malfunction) after a 40 mile freeway drive and come to a stop at the exit. Dealer can find NO problems anywhere except to say that to solve the problem I need to put the stock exhaust back on because the loss of back pressure is what is tripping the EGR code.

HELP PLEASE

Aug 5, 2005 | 01:47 PM

sickspeedvette

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From: Dallas/Spring Texas

with as many cars as there are around here with aftermarket exhausts, this would happen all the time

Aug 5, 2005 | 01:55 PM

audible

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From: Temecula CA

Okay...does anyone have better advice for me than what the dealer told me??

Aug 5, 2005 | 03:01 PM

CFI-EFI

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From: The Top of Utah

Tell the dealer. "Thanks for nothing. Can you recommend someone that knows what they are doing?". That'll get his attention.

RACE ON!!!

Aug 5, 2005 | 03:12 PM

cv67

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From: altered state

St. Jude Donor '05

What year?

Aug 5, 2005 | 05:07 PM

audible

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Quote:

Originally Posted by cuisinartvette

What year?

1996 LT1 with automatic trans.

Nov 18, 2012 | 11:06 AM

90_vette

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Same issue here. 1996 LT1 Vert. I have factory CATS, resonator removed, straight pipe going into Magnaflow Axlebacks. I can clear the code, after about 20 miles of driving code returns.

Nov 18, 2012 | 01:55 PM

Tact

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From: Eads, Tennessee

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St. Jude Donor '05 thru '24

Quote:

Originally Posted by 90_vette

Same issue here. 1996 LT1 Vert. I have factory CATS, resonator removed, straight pipe going into Magnaflow Axlebacks. I can clear the code, after about 20 miles of driving code returns.

http://forums.corvetteforum.com/foru...s-or-more.html