DIY: Throttle Body coolant by-pass...

blanz · 01-07-2007, 12:44 PM

If you want a no-cost mod. to lower the temperature of the intake charge, the following DIY shows you how to by-pass the hot coolant that is normally circulated around the Throttle Body. Keep in mind that if you live in the northern U.S. or Canada where winter temperatures drop well below freezing, this mod. may not be for you. Only attempt this mod. if you feel that there would be no potential for icing up of the throttle plate inside your throttle body.

First step is to prepare about 18" of 5/16" I.D. fuel hose to be used as the new by-pass hose.

Then remove your intake to be able to get to the two 5/16" I.D. coolant hoses that run from the engine to the TB. Remove the two hoses shown

Next, remove the coolant line that runs to the top side of the engine as shown

Take your new hose and clamp and secure it in place there.

Next, remove the lower hose that connects to a nipple on a black coolant pipe and clamp the new hose in place.

Wash away any spilled coolant at this point, taking care not to get any water into the TB or the manual transmission vent (small right-angle rubber tip facing forward sticking out of the tranny). I also flushed out the Throttle Body after removing the lines and capped the nipples.

Optional:
Take some 1/2" I.D. plastic corragated cable covering and place over the new by-pass hose to protect the near-by fuel line from heat.

Reinstall your intake, making sure you reconnect the MAF sensor harness and vent lines and start 'r up and check for leaks.
This mod. really drops the temperature of the throttle body which in conjunction with an intake manifold insulating gasket (Hondata style) should really help drop the intake air temperature making for a denser and more powerfull charge.

Enjoy... Bill.

=============================

dannn · 01-07-2007, 01:27 PM

+ repped

blueroadster · 01-07-2007, 02:02 PM

Is there any benefit to using the fuel line over just capping all of the stock hose connections?

***Zeuceone*** · 01-07-2007, 02:08 PM

the coolant needs to go somewhere.

**twistedframe** · 01-07-2007, 02:20 PM

Quote:

Originally Posted by blueroadster

Is there any benefit to using the fuel line over just capping all of the stock hose connections?

you can cap off the ports on the throttle body, but the coolant coming from the engine needs to be recirculated.

blueroadster · 01-07-2007, 02:23 PM

Quote:

Originally Posted by twistedframe

you can cap off the ports on the throttle body, but the coolant coming from the engine needs to be recirculated.

I better go fix this then. Ive been running the car for several weeks with all of the lines capped.

bossman · 01-07-2007, 02:33 PM

Quote:

Originally Posted by blueroadster

I better go fix this then. Ive been running the car for several weeks with all of the lines capped.

Yeah...you might wanna do that asap.

your car might have met an early death if you drove in AZ or Tx in the summer like that.

Storm · 01-07-2007, 02:38 PM

Blanz,

What did you use to cap the nipples on the throttle body?

blanz · 01-07-2007, 04:01 PM

Quote:

Originally Posted by blueroadster

Is there any benefit to using the fuel line over just capping all of the stock hose connections?

Probably not. In fact, that was my first thought but all I could find for caps were typical rubber vacuum caps and I was afraid that the pressue could blow the end of the cap off since it was just rubber with no dacron reinforcement. But yes, capping it off is probably just as good.

blanz · 01-07-2007, 04:05 PM

Quote:

Originally Posted by Storm

Blanz,

What did you use to cap the nipples on the throttle body?

Storm · 01-07-2007, 04:15 PM

repped

adamhoud · 03-02-2007, 12:01 PM

Pardon my ignorance, but how do you flush the throttle body?

adamhoud · 03-03-2007, 03:50 AM

bump?

Andrei'sCivic · 03-03-2007, 04:31 AM

I've tried this on my older 1994 Mitsubishi Mirage, good no bad effects. But with my friend's 01 Honda Civic (lives in socal) his throttle body iced up and his throttle response and acceleration sucked until we reversed the modification. Also tried this on a 2003 Nissan Sentra XE, dad drove the car, coolant leaked, engine overheated. A month later car has problems starting. Under emissions warranty following a Technical Service Bulletin they changedthe fuel pump or pressure regulator. A year later the problem came back progressively until the dealer got their hands on it and said it needed a new head gasket. Be careful with this mod.

**Qshooter151** · 03-04-2007, 09:23 PM

Quote:

Originally Posted by adamhoud

Pardon my ignorance, but how do you flush the throttle body?

before you use your new hose to reroute the coolant, attach it to one of the fittings on the throttle body and blow.

healtoc · 03-06-2007, 04:42 PM

Isn't this done when you get the AEM CAI...i coulda sorn it said to...thats why i did it along time ago. I thought we all knew about this mod.

reaper702 · 03-08-2007, 01:11 AM

am i the only one that got lost with that diy?

blanz · 03-08-2007, 06:26 PM

Quote:

Originally Posted by adamhoud

bump?

Just plain ol' fresh water from the garden hose.

ken42o · 03-09-2007, 03:24 AM

is it possible to do this on the r18?

mO 64 StAnG 06 · 03-09-2007, 02:29 PM

Should be able to do this on the R18. Hell im positive they have coolant running through the TB, it wouldn't make sense not too.

01-07-2007, 12:44 PM	#1 (permalink)
blanz Member Join Date: Oct 2006 Location: at the Bada Bing Posts: 95 Geezer Squad member #72 iTrader: 0 / 0%	DIY: Throttle Body coolant by-pass... If you want a no-cost mod. to lower the temperature of the intake charge, the following DIY shows you how to by-pass the hot coolant that is normally circulated around the Throttle Body. Keep in mind that if you live in the northern U.S. or Canada where winter temperatures drop well below freezing, this mod. may not be for you. Only attempt this mod. if you feel that there would be no potential for icing up of the throttle plate inside your throttle body. First step is to prepare about 18" of 5/16" I.D. fuel hose to be used as the new by-pass hose. Then remove your intake to be able to get to the two 5/16" I.D. coolant hoses that run from the engine to the TB. Remove the two hoses shown Next, remove the coolant line that runs to the top side of the engine as shown Take your new hose and clamp and secure it in place there. Next, remove the lower hose that connects to a nipple on a black coolant pipe and clamp the new hose in place. Wash away any spilled coolant at this point, taking care not to get any water into the TB or the manual transmission vent (small right-angle rubber tip facing forward sticking out of the tranny). I also flushed out the Throttle Body after removing the lines and capped the nipples. Optional: Take some 1/2" I.D. plastic corragated cable covering and place over the new by-pass hose to protect the near-by fuel line from heat. Reinstall your intake, making sure you reconnect the MAF sensor harness and vent lines and start 'r up and check for leaks. This mod. really drops the temperature of the throttle body which in conjunction with an intake manifold insulating gasket (Hondata style) should really help drop the intake air temperature making for a denser and more powerfull charge. Enjoy... Bill. =============================

LinkBacks (?) LinkBack to this Thread: http://www.8thcivic.com/forums/engine/25348-diy-throttle-body-coolant-pass.html
Posted By	For	Type	Date
Throttlebody coolant Bypass mod - Page 2 - 8th Generation Honda Civic Forum	This thread	Refback	02-19-2008 09:19 AM
DIY: Throttle Body coolant by-pass... - 8th Generation Honda Civic Forum	This thread	Refback	02-13-2008 02:20 PM
TB spacer - ClubSi	This thread	Refback	01-05-2008 02:44 PM
DIY: Throttle Body coolant by-pass... - Page 2 - 8th Generation Honda Civic Forum	This thread	Refback	12-27-2007 10:23 PM

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01-07-2007, 01:27 PM	#2 (permalink)
dannn Senior Member Join Date: Nov 2006 Posts: 519 iTrader: 0 / 0%	+ repped

01-07-2007, 02:02 PM	#3 (permalink)
blueroadster Senior Member Join Date: Aug 2006 Location: Maryland Posts: 3,568 iTrader: 7 / 100%	Is there any benefit to using the fuel line over just capping all of the stock hose connections?

01-07-2007, 02:08 PM	#4 (permalink)
*Zeuceone* Kill Your Self Krew Join Date: Nov 2006 Location: Killa Cali. Posts: 44,690 iTrader: 19 / 100%	the coolant needs to go somewhere.

01-07-2007, 02:38 PM	#8 (permalink)
Storm Senior Member Join Date: Jun 2005 Location: NJ Age: 29 Posts: 373 iTrader: 0 / 0%	Blanz, What did you use to cap the nipples on the throttle body?

01-07-2007, 04:15 PM	#11 (permalink)
Storm Senior Member Join Date: Jun 2005 Location: NJ Age: 29 Posts: 373 iTrader: 0 / 0%	repped

03-02-2007, 12:01 PM	#12 (permalink)
adamhoud Senior Member Join Date: Sep 2006 Location: Bay Area, CA Posts: 1,015 Adam iTrader: 3 / 100%	Pardon my ignorance, but how do you flush the throttle body?

03-03-2007, 03:50 AM	#13 (permalink)
adamhoud Senior Member Join Date: Sep 2006 Location: Bay Area, CA Posts: 1,015 Adam iTrader: 3 / 100%	bump?

03-03-2007, 04:31 AM	#14 (permalink)
Andrei'sCivic Senior Member Join Date: Dec 2006 Location: Long Beach, CA Age: 21 Posts: 658 Andrei iTrader: 2 / 100%	I've tried this on my older 1994 Mitsubishi Mirage, good no bad effects. But with my friend's 01 Honda Civic (lives in socal) his throttle body iced up and his throttle response and acceleration sucked until we reversed the modification. Also tried this on a 2003 Nissan Sentra XE, dad drove the car, coolant leaked, engine overheated. A month later car has problems starting. Under emissions warranty following a Technical Service Bulletin they changedthe fuel pump or pressure regulator. A year later the problem came back progressively until the dealer got their hands on it and said it needed a new head gasket. Be careful with this mod.

03-06-2007, 04:42 PM	#16 (permalink)
healtoc Senior Member Join Date: Nov 2006 Location: SoCal Age: 21 Posts: 169 iTrader: 2 / 100%	Isn't this done when you get the AEM CAI...i coulda sorn it said to...thats why i did it along time ago. I thought we all knew about this mod.

03-08-2007, 01:11 AM	#17 (permalink)
reaper702 Senior Member Join Date: Jul 2006 Location: Sin City Age: 21 Posts: 3,818 iTrader: 6 / 100%	am i the only one that got lost with that diy?

03-09-2007, 03:24 AM	#19 (permalink)
ken42o Senior Member Join Date: Feb 2007 Location: NYC Posts: 102 iTrader: 0 / 0%	is it possible to do this on the r18?

03-09-2007, 02:29 PM	#20 (permalink)
mO 64 StAnG 06 Senior Member Join Date: Jan 2007 Location: Wylie, Texas Age: 19 Posts: 2,230 iTrader: 0 / 0%	Should be able to do this on the R18. Hell im positive they have coolant running through the TB, it wouldn't make sense not too.