[Jose Lozano Pascual]

I hope this is the correct forum:

I have a leak in piece marked as 147 (in red in my photos), wich is a metal pipe (not rubber hose):

Problems:

-Can´t find this piece to buy
-That pipe on my car is different because it has another two pipes from it (see marked in yellow in photos, it has a "bypass" for the throttle body, wich I assume I can disable to do the throttle body bypass mod)
-I really don´t need this piece, because I just want to put the heater hose (33) directly to the engine BUT at the end of the little leaking pipe there is a nut (in green) that goes screwed into the engine, and I don´t know how to connect the hose to that.

Can I put the hose without that lug? Can I find just that little straight pipe without that "bypass" for the throttle body?

Thank you.

 

[Injuneer]

There is a possibly clearer diagram of the pipe, which has two smaller pipes coming off of it. That piece is shown in the factory manual, page 6A2B-4, and is part #150 in the diagram, "pipe, heater inlet". Not sure if that will make it any clearer with regard to how to replace it.

It would appear the bolt (part #151) passes through a bracket which seats the pipe into/against part #149, "nipple, heater inlet". Perhaps once you get the pipe off, it can be brazed, clamped, or somehow repaired.

I don't know the details of the 3.4L system.... just offering some thoughts since there are no other responses.

 

[JOE68]

if you eliminate the throttle body lines you will run the risk of icing on the throttle blade. this can happen without it being really cold out as the air rushing in at speed is very cold and moisture in the air will form ice and make engine not run very good

 

[Injuneer]

Except that system is an overdesign, maybe suitable for people living north of the Arctic Circle. Mine's been bypassed for 20+ years, and never a problem, even as ambient temps approached 0°F. Dyno proven +6 HP on a totally stock LT1. Maybe it's different on the 3.4L, but can’t imagine why. The under hood temps in the 4th Gens are extremely high in all seasons.

 

[Jose Lozano Pascual]

There is a possibly clearer diagram of the pipe, which has two smaller pipes coming off of it. That piece is shown in the factory manual, page 6A2B-4, and is part #150 in the diagram, "pipe, heater inlet". Not sure if that will make it any clearer with regard to how to replace it.

It would appear the bolt (part #151) passes through a bracket which seats the pipe into/against part #149, "nipple, heater inlet". Perhaps once you get the pipe off, it can be brazed, clamped, or somehow repaired.

I don't know the details of the 3.4L system.... just offering some thoughts since there are no other responses.

Thank you, that diagram will help!

if you eliminate the throttle body lines you will run the risk of icing on the throttle blade. this can happen without it being really cold out as the air rushing in at speed is very cold and moisture in the air will form ice and make engine not run very good

Naah don´t worry, I live in Spain, mediterranean coast, it barely snows one day a year XD

 

[JOE68]

good info Fred... never knew anyone who tried it