qha_vn

guys, i got coolant leak from the bottom of IACV and I decided to bypass the coolant line to it. before that I deleted EGR already.

I am thinking of deleting coolant line to throttle body so that it does not get heated unnecessarily. it will also prevent coolant leak from there later all. I live in a hot weather country, similar to CA.

anyone say no?

Yamae

You gas mileage would be slightly poorer other than the fast idle issues. But your warm climate wouldn't cause any serious problem.

Regarding the EGR deletion, the air pollution level in your country will be increased.
Especially, the NOx level becomes more than before about 0.000001ppm.

qha_vn

Thanks Yamae

PureDrifter

iTrader: (10)

Everything will work fine with the coolant bypass, just loop the hose back from inlet to outlet under the throttle body.

The SC400 guys have been doing it for years.

qha_vn

thanks PureDrifter, I have no idea why and how, but will try to see under bonnet and figure it out

am more confident deleting it

timmy0tool

iTrader: (7)

correct me if i'm wrong but the iacv needs coolant to regulate the idle speed especially on cold mornings. as the coolant warms up, the idle drops to normal. i do see the OP is from vietnam which never sees cold mornings, so it will be irrelevant to him.

PureDrifter

iTrader: (10)

I can't recall but don't believe the IACV has a coolant temp sensor built in. The idea of having coolant flowing through the TB in general is t prevent ice formation during cold weather (windchill becomes an issue). OP lives in an area with no frost usually, so he should be fine.

qha_vn

OP?

PureDrifter

iTrader: (10)

OP= original poster.

DoktorYes

Do it and don't worry about gas mileage.On cool days.

qha_vn

yes I got it done, no noticeable changes. but happy about it, less likely hood of leak, cleaner look :-)

AaronUCF11

Hi, how do you surgest that these woud effect mpg and idle speed? Iscv is just a stepper motor and valve. Its not like a choke on a carb car where there is sometimes a heating element.

Only way I could see the mpg go down is a ever so slightly cooler intake charge, reducing the fuel atomisation, again ever so slightly.

I removed the metal fittings from the water neck at the front and tapped threads to blank the holes. I used a rubber blanking cap for the outlet behind the manifold.