PAIR valve

[GreatLakesWaterjet]

Can the Pair valve and the silencer with all the related hoses and hardware be removed without any adverse affects ? Need the room for other goodies.

 

[cruiserdan]

The vehicle will function without those pieces in place. The silencer is the only item that can legally be removed without violating emission control tampering laws. If you live in a municipality that has emissions testing in place, your vehicle will fail without the PAIR valve and injection tubes in place and functioning.

If you choose to remove those items I urge you to save them because at some point you will need to re-install them either because of emissions testing or to be able to sell the vehicle.

D-

 

[GreatLakesWaterjet]

Cruiserdan, if I do remove them, do I need to block off the tubes on the manifold? Can I just plug off the vacuum tube? Will this bring up any codes? I do not have testing here, but I will save the parts.

 

[cruiserdan]

If you remove the PAIR valve you will also need to remove the injection tubes that attach to the exhaust manifolds. You will need to use the manifold-end tube flanges as templates in order to fabricate block-off plates to attach to the exhaust manifolds where the tubes were originally fitted.

Alternatively you could purchase a set of 95-up exhaust manifolds and install those.

D-

 

[GreatLakesWaterjet]

Thanks, C-Dan. I'll make block-off plates and remove everything else. Need the room for a york.

 

[RavenTai]

if you mount a york please post up pics of the brackes and sounces for the parts. a lot of people would like to copy such a setup (myself included).

no PAIR to worry about on the later trucks

 

[cruiserdan]

Ali has a york on his, I saw it at Moab.

 

[landtoy80]

The PAIR lets air into the exhaust so the cats burn better/hotter, right?
Do you have to worry about the cats getting loaded up or pluged as they might not burn a hot?
As I just fixed my PAIR pipe leak, I was thinking of making a block off plate. I have a sheet of gasket material that you cut to fit that I used to block off the EGR on the 2F.

 

[Boston Mangler]

The PAIR lets air into the exhaust so the cats burn better/hotter, right?

Do you have to worry about the cats getting loaded up or pluged as they might not burn a hot?.

I dont know, but that is a good question that i am curious about, as i am getting ready to do this and install a York!

I guess the 95+ dont have a pair valve, so SOMETHING is taking care of this. Any insight?

Thanks

 

[landtank]

I guess the 95+ dont have a pair valve, so SOMETHING is taking care of this. Any insight?

I beleive it's better fuel management which leaves less to burn in the cats.

 

[Boston Mangler]

Will there be advers effects removing it?

 

[landtank]

short term I doubt it, long term I don't know.

 

[cruiserdan]

Will there be advers effects removing it?

See post #2

 

[SUMOTOY]

short term I doubt it, long term I don't know.

http://www.autoshop101.com/forms/h65.pdf#search=%22secondary%20pulsed%20injection%20emissions%22

Not sure how much higher PAIR would make the HC on decel, but it's HC's (not CO) that are the concern. Unburnt HC (fuel) will clog a catalyst if the freq/duration is long enough.

TRD relocates it to the back of the head, you could always do that. Whatever you decide to do with it, I'd definitely keep the parts you took off. When I do prepurchase inspections in my shop, I *always* look for emissions components, PAIR would be a major emissions component on the 80.

IMO>IMO, I doubt PAIR removal will cause *catastrophic failure*, but the assumed risk is clogged catalysts and false 02 readings causing increased lean condition. I'd relocate it, but leave it unless someone has cracked the fuel tables in the FTU.

Scott Justusson

 

[MoGas]

Does anyone have a picture of the TRD bracket for PAIR relocation? Better yet does anyone have the bracket and not need it or not install it yet? I can have one of my Engineers draw it up and I'll make copies for those that want to use the York compressor. I am thinking of ways to relocate mine and I'll have to cut a section out of the pipes and TIG weld them back together.

Thanks,
Dave

 

[stlcruiser]

Greetings:

A pair relocation kit would be of great interest to me from someone with the ability to fabricate one.

Steve
94' 165,000

 

[cruiserdan]

When TRD did offer the kit it was about 200 bucks. It consisted of a set of pipes, some bolts, an air intake pipe and a bracket to re-locate the valve rearward.

The injection pipes were fairly complicated and well made. They looked OEM. the main reason for the complication was the routing required to clear the throttle body and the blower case.

I have a set-up that I temporarily removed in anticipation of a head gasket job. It's a bitch to install and I did not want to deal with it whilst doing a head gasket. I will dig it out and take some photos of it.

No, it's not for sale and it will not leave my posession for any reason...

 

[MoGas]

Would you take photos with a measuring tape to show dimensions?

Dave

 

[MoGas]

When are you doing the HG? I could blast over to the ABQ and take a sketch and precise measurements and photos to RE it.

Dave

 

[Boston Mangler]

No, it's not for sale and it will not leave my posession for any reason...

How about "loaning" it to a machine shop to copy it?