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Old 10-03-2006, 02:54 PM   #1
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What EGR valve with headers?

Just as the question asks.what would be a better Egr valve to use with headers? I need to replace mine due to it causing a good pinging problem and the wonderful code 32 issue.I know there is a differance between negative and postive valves.Does anybody know?
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Old 10-03-2006, 07:59 PM   #2
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This is an educated guess on my part, but a negative backpressure (BP) may be best. In this case as back pressure increases the valve will close. A positive BP valve needs BP to open. With headers and a decent exhaust there may not be enough BP to open it.

Where a negative BP valve will still open.

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Old 10-03-2006, 08:54 PM   #3
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i believe RBob is right, a negative back pressure valve would be better with headers than a positive valve would be.
but, in my opinion a non-back pressure valve would be the best bet.

as far a i know, you can tell the difference between the types of EGR valves by looking at the end of the part number, a positive valve has a P on the end of the number & a negative has a N on the end. something like 17084582 P would be a positive back pressure valve. this may not apply to aftermarket valves.
with the valve off the motor, if you appy vacuum to the valve & it opens, then it is a non-back pressure valve.
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Old 10-04-2006, 12:51 AM   #4
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non back pressure would be positive right?
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Old 10-04-2006, 10:51 AM   #5
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Quote:
Originally Posted by robertfrank View Post
non back pressure would be positive right?
There are 3 types of valves: negative BP, positive BP, and non-back pressure.

The non-back pressure will just open and close according to the applied vacuum.

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Old 10-04-2006, 06:52 PM   #6
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Well I tried to get a new egr valve from autozone and I gave them a negative egr valve number Rochester 17088125. The one that's already on the car.They sent me a positive egr valve WELLS EGR132. It says on the paper that the valve came with that if you use the appropiate orifice washer in the valve that it will act as a Negative egr valve. Is this correct?
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Old 10-04-2006, 08:28 PM   #7
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the orifice washer controls how much the EGR valve will flow, it doesn't make any changes to the valve being a negative or positive back pressure.

if i can find my exploded views of what makes an EGR valve a back pressure or non- back pressure valve i'll post it up.


on a side note, i personally don't like Wells parts, i have had too many problems with them.
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Old 10-16-2006, 01:55 PM   #8
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Use a Negative backpressure valve. With Edelbrock headers, high flow cat, and hooker cat back exhaust i was having CODE32 problems. Went from a positive valve to a negative valve from a TBI truck and it works like a charm.
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Old 12-06-2006, 07:43 PM   #9
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I'm bringing this one back due to the fact I can't stop this damn pinging.Where can I find a negative backpressure valve? I have looked every where and every parts store in town only carries positive valves.This is driving me nuts.I have even tried the chevy store here in town and they say the part number I have given them isn't a real number(17088125 N) so I have no clue as what to do now. I don't want to blow up my freaking engine from detenation.
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Old 12-07-2006, 11:42 AM   #10
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Well I'm hoping I found the right EGR valve i was given a new number by a different dealer in phoenix 17113496.I ordered it today.I guess if all else fails I just gave Brian at Tbichips a call to see what it would cost to burn me a chip without EGR.He said he could burn it for 50 bucks.It's cheaper than a new valve so lets's see what happens.
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Old 11-09-2008, 06:06 AM   #11
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Re: What EGR valve with headers?

sorry to resurrect this dead thread, but could you let us know which egr you ended up using (if you are using one at all xD) and which part# it has?
i just couldn't find other threads with sufficient information.
thanks
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Old 11-09-2008, 11:08 PM   #12
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Re: What EGR valve with headers?

I too would like to know what egr ended up working

Let us know

Thanks
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Old 11-11-2008, 09:17 PM   #13
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Re: What EGR valve with headers?

Honestly I got a chip from tbichips to delete it out. No matter what I did with ANY EGR valve I get rid of the code 32. So I gave up and put in a block off plate.
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Old 11-12-2008, 01:57 AM   #14
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Re: What EGR valve with headers?

mmh, that's too bad i intended to keep egr to save some gas.. i think egr is a quite promising system for fuel economy at least.

anyone has egr + headers running?
maybe RBob could chime in here, i know that the EBL has some nice tables and settings for the egr.

thanks
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Old 11-20-2008, 04:24 PM   #15
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Re: What EGR valve with headers?

hey, to the ones still waiting on a reply on this and can't quite figure out which egr valve to use, i contacted RBob about this and that's what he replied:

Quote:
Andi,

I have been looking around for the EGR valve I used on the LG4 TBI engine. I think that this is the one I had been using. Numbers on top are:

DKZ 17092172
012 41N

This is most likely a truck EGR from a pickup or van. Say in the '88 through '91 model year (MY).
i looked up the part number and all i came up with so far was an LT1 EGR valve for the 94-97 years.. anyone else?
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Old 11-20-2008, 06:19 PM   #16
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Re: What EGR valve with headers?

I don't know the number BUT the stock EGR for a 91-93 350 (LTZ)
caprice works great. I'll try to get the part number later.
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Old 11-21-2008, 03:47 AM   #17
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Re: What EGR valve with headers?

hey, i just got another reply by RBob on this:
Quote:
I found the other EGR valve. Here are the numbers from it:

DFX 17088125
264 91N

The only difference between this one and the other one is that the orifice is smaller and the vacuum line connection is rotated 90 degrees.
but then, this one was the one already tried by robertfrank wasn't it? i even found this to actually be the original 305 tbi egr valve on some sites..
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Old 11-22-2008, 04:16 AM   #18
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Re: What EGR valve with headers?

Quote:
Originally Posted by ownor View Post
anyone has egr + headers running?
The stock one is working fine for me.
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Old 11-22-2008, 04:16 AM
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