Throttle body bypass???
Thread Starter
Registered User
Joined: Jun 2003
Posts: 543
From: metro detroit
Throttle body bypass???
Has anyone ever done the throttle body bypass by plugging the holes instead of splicing the hose together? I know it would be cheaper to just use the hose splice, but I want to clean up the engine compartment as much as possible. I was going to use a threaded plug where the hose comes out of the side of the intake manifold to the throttle body, plug the two holes on the throttle body, and put a plug on the radiator where it drains into, after it leaves the throttle body. Does anyone foresee a problem with this? Has anyone ever tried it? Any help would be appreciated.
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Joined: Aug 2001
Posts: 3,505
From: looking for a flow bench so Brook and I can race
by "splice together" i'm going to guess you meant "put together"
Plugging that hole is a bad idea. coolant pressure will build and it will either
a. blow
b. cause "backpressure" in the coolant passages
Plugging that hole is a bad idea. coolant pressure will build and it will either
a. blow
b. cause "backpressure" in the coolant passages
Thread Starter
Registered User
Joined: Jun 2003
Posts: 543
From: metro detroit
I don't think there is much pressure going through that. If you take the radiator cap off, with the engine running(not while its hot), and look down on the inside where the tube dumps back into the radiator after leaving the throttle body, the coolant just kinda gently flows. More that a dripple, but it doesn't seem like its really pushing. I was thinking that the hole on the side of the intake manifold where it comes out is just "skimming" coolant from a passage, kind of like where the temp. sender is threaded into the water pump. Its just tapped into the normal coolant flow. Does that make any sense?
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Joined: Dec 1969
Posts: 27,725
From: Little Rock, AR
There is no coolant hose that comes from the intake manifold into the throttle body. The intake manifold is a "dry" manifold.
There is a pipe that comes from the back of the heads to the front of the engine that would have a 90º elbow going into the throttle body on the 1995-1997s. You don't want to block off that pipe as it keeps pockets of steam vented from the heads.
You don't have to buy anything to do the bypass on the 1995-1997s. Just plug the hose from the radiator to the steam pipe, bypassing the throttle body.
There is a pipe that comes from the back of the heads to the front of the engine that would have a 90º elbow going into the throttle body on the 1995-1997s. You don't want to block off that pipe as it keeps pockets of steam vented from the heads.
You don't have to buy anything to do the bypass on the 1995-1997s. Just plug the hose from the radiator to the steam pipe, bypassing the throttle body.
Thread Starter
Registered User
Joined: Jun 2003
Posts: 543
From: metro detroit
Well, sorry guys....I was looking at the wrong hose. That picture helped out. When I did my intake manifold gasket about a year ago, you'd think I would have seen which ones were which, but oh well, I guess thats why this website exists......thanks.
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Joined: Oct 2002
Posts: 2,277
From: Orange Kounty, Kalifornia
I did that mod using that very picture by Shoebox. Worked great. Also, I went to the hardware store and got two plastic end caps to cover the exposed TB holes.... 20 cents each and it looks clean.
Registered User
Joined: Oct 2002
Posts: 2,277
From: Orange Kounty, Kalifornia
I did that mod using that very picture by Shoebox. Worked great. Also, I went to the hardware store and got two plastic end caps to cover the exposed TB holes.... 20 cents each and it looks clean.
Registered User
Joined: Dec 1969
Posts: 27,725
From: Little Rock, AR
Originally posted by Kuma
BMR sells a nice little kit for 14.95 that contains all the parts so you don't have to run off to pepboys or whatever. Plus you can add another line to your mods...
BMR sells a nice little kit for 14.95 that contains all the parts so you don't have to run off to pepboys or whatever. Plus you can add another line to your mods...
Registered User
Joined: May 2000
Posts: 1,327
From: Under my Car as usual :)
Coolant actually flows through the hose that you are using to bypass. If you plug these up, the heads will basically melt.
You don't need a "kit" you unhook said hose from TB and hook into the the metal line coming from the back of the head. Simple, You can even use the same clamps. Earlier years are a little more complicated...
-Shannon
You don't need a "kit" you unhook said hose from TB and hook into the the metal line coming from the back of the head. Simple, You can even use the same clamps. Earlier years are a little more complicated...
-Shannon
Registered User
Joined: Mar 2003
Posts: 1,876
From: Maryland
Originally posted by shoebox
There is no coolant hose that comes from the intake manifold into the throttle body. The intake manifold is a "dry" manifold.
There is a pipe that comes from the back of the heads to the front of the engine that would have a 90º elbow going into the throttle body on the 1995-1997s. You don't want to block off that pipe as it keeps pockets of steam vented from the heads.
You don't have to buy anything to do the bypass on the 1995-1997s. Just plug the hose from the radiator to the steam pipe, bypassing the throttle body.
There is no coolant hose that comes from the intake manifold into the throttle body. The intake manifold is a "dry" manifold.
There is a pipe that comes from the back of the heads to the front of the engine that would have a 90º elbow going into the throttle body on the 1995-1997s. You don't want to block off that pipe as it keeps pockets of steam vented from the heads.
You don't have to buy anything to do the bypass on the 1995-1997s. Just plug the hose from the radiator to the steam pipe, bypassing the throttle body.