91 Firebird TBI (code "E") - which EGR ?
01-16-2009, 02:38 PM
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Car: 87 Firebird Formula
Engine: TBI, V8, 305cui, w. A/C
Transmission: TH700R4
91 Firebird TBI (code "E") - which EGR ?
Hi !
Have a 91 Firebird TBI engine (code "E"). At present it has no EGR valve installed. Need a new one. Which kind of EGR valve do I need ? :
"P" = positive backpressure
"N" = negative backpressure
blank = ported
Which part number is stamped on yours ?
Thx
P.
Have a 91 Firebird TBI engine (code "E"). At present it has no EGR valve installed. Need a new one. Which kind of EGR valve do I need ? :
"P" = positive backpressure
"N" = negative backpressure
blank = ported
Which part number is stamped on yours ?
Thx
P.
01-27-2009, 01:46 AM
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Re: 91 Firebird TBI (code "E") - which EGR ?
I'm not 100% certain, but I want to say that yours is "positive backpressure." When I still had the 305 tbi in my car (code E), I bought a new egr valve. The PN on the box is EGR1212 (BWD Brand). It also has POS printed on the part. The other reason I believe it to be positive backpressure is that when I put headers on the car and reduced the backpressure, the check engine light came on claiming it was unable to open the egr vavle. From reading the factory service manual, it appears that the egr valve uses exhaust pressure to help open the valve. If the pressure isn't there (like when you have headers installed), it's harder for the valve to open...
Can anyone confirm this?
Can anyone confirm this?
Last edited by rhit_rs; 01-27-2009 at 01:47 AM. Reason: typos
01-27-2009, 01:38 PM
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Car: 87 Firebird Formula
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Transmission: TH700R4
Re: 91 Firebird TBI (code "E") - which EGR ?
Hi !
Thx for the reply. Will try it !
Regs
P.
Thx for the reply. Will try it !
Regs
P.
01-29-2009, 05:11 AM
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Car: 84 TA / 89 Formula
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Re: 91 Firebird TBI (code "E") - which EGR ?
dunno if this is of any help, but i just thought i'll post this for you to look into. there are some more part numbers, including both information about the stock setup as well as egr compatibility with headers.
edit: lol forgot the link
https://www.thirdgen.org/forums/tbi/390118-what-egr-valve-headers.html
edit: lol forgot the link
https://www.thirdgen.org/forums/tbi/390118-what-egr-valve-headers.html
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