rx7guy

After doing the timing belt change along with the water pump, timing belt pulleys, ignition coils, spark plugs, and spark plug wires, I'm having coolant that's leaking.

I purchased one of those fluorescent fluids that tells you where coolant's leaking and I found out where it's coming from, under the throttle body.

The best guess I can tell without taking the throttle body off is there's a metal hose connecting something on the back of the thermostat housing and it's the most yellow(using the flashlight) that I can see.

Anyone experience this?

Also, does anyone have instructions on removing the throttle body?

Thanks in advance!

Mike

JAndersson

Has no experience in this but a have a link on how to remove the throttle body: http://www.lexls.com/tutorials/EFI/throttlebody.html

rx7guy

How did I miss that link? oops.

Hopefully I won't have to take off the water pump to reseal it.

Thanks a bunch!

LiCelsior

iTrader: (32)

your leak may be coming from the circled above. that is a coolant line from the IACV

3UZFTE

I do believe that is the only place coolant is traveling on that side. Replace those style of clamps with screw ones and see if your problem goes away. Could try just running one piece of hose from the IACV to the coolant line under the throttle body. Just some ideas.

PureDrifter

iTrader: (10)

yeah, you could do the throttle body coolant bypass, it's popular on most other cars and is only meant to be used in warmer climates.

3UZFTE

Like PD mentioned, only in warmer climates, because the coolant in the TB is supposed to warm the air up before its mixed with gas in order to prevent stalling and poor emissions, otherwise it will have no affect on the engine once it's warmed up to op. temp.

skperformance

iTrader: (6)

I think you guys have it confused.
The TB coolant line is to heat up the intake air due to sub zero temps . So it is needed in colder climates not warmer ones.

gmacrae

Yup, a frozen up throttle body could be a killer.

But it would take a VERY cold climate to do this. I'd imagine most of the US's climate would be fine for removing the TB and IAC coolant plumbing. The line runs from the thermostat housing, to the IAC, to the throttle body, to the back of the engine. Cap the nipples at the thermo housing and back of the engine, remove all piping in between - done. Makes a few things easier to service/reach and is one less thing to leak.

rx7guy

Thanks for those wonderful pics and descriptions of what possible issues there could be.

I'm so relieved I don't have to rip out all those parts to get to the water pump. Plus my compressor isn't working properly so I won't be able to take off the crankshaft bolt.

You guys are awesome and I'm excited to replace that hose or at least use a better clamp!

I'll post what happens at the end of this week or next.

Mike

3UZFTE

I think you misunderstood what I was say due to how I stated it. I meant to convey that the TB bypass "mod" was only for warmer climates as it is needed in cold weather climates in cold starts to control emission and help during warm up mode.

rx7guy

So I looked at the coolant hose licelsior showed in the pic and it's definitely not that one as there's no leaking.

Here are some pics I took.

LiCelsior

iTrader: (32)

hmm...there IS a coolant line that runs beneath the intake mani...

rx7guy

Crap. There's a bunch of hoses connected to the intake manifold. Good thing I have tomorrow night and all day Friday to tear it apart...

3UZFTE

Yeah, that is a hard line, it could be possible that the o-ring has been torn. In the picture you have the EGR shown, not sure if thats leaking but if you go rent a cooling system pressure tester, you will find you answer a lot sooner than later.

RX7, do you remember replacing this o-ring when you did the water pump? Did you lube this o-ring as they have a tendency to tear.