3RZ egr question

Need some help and can't find anything in my manual or pictures to help. Does my egr valve have coolant running through it? Is so does the line coming off the back of my head go to the outlet on the egr closest to the firewall? Then the next one to the throttle body? Then a return line from the throttle body back to the coolant? Any answers would be appreciated I'm pulling my hair out. I've been told no coolant runs though the egr only vacuum but can't run across another truck to look at and every diagram I look is all about the actuator. Thanks Bryan

 

No coolant lines. (this is not correct )

What year truck?
What exactly is the problem that you are dealing with?

 

I did and engine swap and Ran did my water lines that run to the EGR wrong when I cranked it to check my oil pressure and it put coolant into my number four cylinder . Couldn't figure it out so did some checking cannot find very info or diagrams that actually show the lines that run to the EGR plenty on the EGR actuator but most diagrams I look at actually do not show anything going to the EGR valve itself. Can't find a truck close to me to pop the hood on and look at everybody has the sixes . Mine is a 99 Tacoma 2.7 3RZ . Have you talk to lots of people some say no water runs through that EGR valve some do but I know when I did the head swap on the previous engine or year ago I had no issues with how I hooked it up . I am no mechanic but work on a lot of stuff and usually have no problem taking things apart and putting them back together but most things are older vehicles and tractors . Pulling my hair out usually I can investigate look through manuals and get it done not so much on this one

 

What I need is a picture or diagram that shows the two large vacuum lines that attach to the EGR and where they go from there

 

I know a few people have looked at. If somebody has a 2.7 please go take a picture of the EGR valve and where two lines running off of it and where they go ! I would promise a great reward but don't have a lot to offer but really need this thing back in use !

 

I think I was wrong about the coolant lines.

I have the FSM for our 3rz, and it does not have a diagram showing those two large side-by-side ports.

But it does describe them as :
"water bypass hose (from IAC valve)" - and -
"water bypass hose (from water bypass pipe)"

 

Thanks that gives me something to go with I just did not think Coolant went through the EGR valve but looking at it it heats the underneath of the vacuum diaphragm and it is my guess

 

Looking at my rig, it looks like the front-most water port on the EGR valve goes to the IAC
using a hose with many turns in it (ie custom OEM hose).
The other one goes downward from the valve, and I can't tell where it ends up.

If you were to purchase those 2 hoses from a Toyota dealer,
the shape of them would indicate what each one connects to.

 

I have them and about there! I'll let you know what I find and give you a result. Thank for your effort it's hard being a shade tree mechanic on newer stuff! Internet is a wonderful thing!

 

and this is why I don't post from my phone, dam auto-correct makes your sentences look like garble

glad @tan4x4 was able to get you help. post some pics of the area for others that may search later on.

 

Hooked up my coolant lines in series running from the back of the head to the egr from the egr to the iac from the iac to the coolant bypass line. Pull the efi fuse and cranked it over and had dry cylinders. Put my plugs in and fired right up. Topped off my coolant let it run for about 4 minutes. Shut it off pulled my plugs checked to make sure nothing in the cylinders all dry. Put the plugs back in and fired it up and started it let it run for 5 minutes or so sounds good no service engine light but smoked a lot more than any New engine I've installed figured there was some coolant in the exhaust but made me a bit nervous. Got it up to temperature then shut it off. It was still smoking did smell like typical exhaust. Pulled a plug it was dry. Think it's all good but first time I've dealt with a computer controlled engine that I've had all apart and back together besides putting a head on one. The old days of a carb, temp gauge, and oil pressure sure seems simple but kind of nice not having to deal with timing! Just paranoid I'm missing somethjng. Not sure i understand the egr system with coolant running around the valve but the previous engine had 270000 on it before i replaced the head do to a burned valve then 25000 and the head gasket went. Never got hot but the l figured my best money was on a new engine. I'll let you know how it all turns out and try to take a picture of the lines to the egr not sure it will show much but we'll see. Thanks again for the input.

 

Frizzman you are correct on the autocorrect just read my previous post! Glad Tan4x4 can read between the lines! I'm barely able to operate a cell phone! Thanks

 

Well turns out my coolant lines routed to the wrong place was not the issue. I had coolant leaking through my egr valve. Everyone I talked to said it can't happen because the coolant onley cools the base of the egr. Well I disconnected the lines and plugged them and ran the truck at an idle and no smoke. Hooked them back up and had a steam engine. Put a new egr valve on and runs great. Lines routed the same as originally even though I thought I had them wrong. Soon as I get time I'm going to take the thing apart and figure out where the failure was. Has any one else ran into this? Everyone I have ask said this doesn't make sense coolant shouldn't be able to get in there.

 

probably just a bad unit then. a weld could have failed and with the pressure the coolant is under could easily sneak through causing problems

 

There was a question about these coolant hoses 2 months ago with a few pictures.

https://www.tacomaworld.com/threads/water-bipass-question.506609/