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EGR valve location on 3.4????

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Old 10-26-2007, 03:12 PM   #1
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EGR valve location on 3.4????

Alright, so I think I'm going to need to replace my EGR valve soon, and at least not to attempt to knock some of the buildup loose.... but I can't find it. If someone has some extra time and could snap a picture of the EGR valve location on the 3.4l in my 98 4Runner, it would be greatly appreciated!! Thanks in advance!!
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Old 10-26-2007, 03:20 PM   #2
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Originally Posted by trd_4runnin11 View Post
Alright, so I think I'm going to need to replace my EGR valve soon, and at least not to attempt to knock some of the buildup loose.... but I can't find it. If someone has some extra time and could snap a picture of the EGR valve location on the 3.4l in my 98 4Runner, it would be greatly appreciated!! Thanks in advance!!
Sure, here it is:















You're probably wondering why there's no pic.
......well, it's because there is no EGR on the 96+ 3.4L motor.

Last edited by MTL_4runner; 10-26-2007 at 03:21 PM.
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Old 10-26-2007, 04:07 PM   #3
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Well, that sucks! I look like an idiot and now its back to the drawing board...

..alright yotatechers, today I was doing about 50 mph and I went full throttle until about 70 (never really tested the 4runner) and then let off the throttle and resumed normal speed. When I slowed almost to a complete stop at the next stop sign, the truck died. When i tried to restart it would not start, but when I tried starting it while giving it throttle, it fired right up. I tested it out a second time and it did the exact same thing. I asked two mechanics who both told me the EGR valve was most likely sticking open, but since I apparently dont have one of those, then what could it be??
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Old 10-26-2007, 04:14 PM   #4
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Clean your IAC.....it may be sticking.
http://www.yotatech.com/f123/re-3-4l...ac-pics-92286/

Also check the dashpot and vacuum lines for leaks.
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Old 10-26-2007, 04:55 PM   #5
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Thanks for the reply. I was planning to clean the IAC and TB anyways so thats cool...

Next question.. I have seen a lot of talk about cleaning the MAF sensor, but my truck has a MAP sensor. What do you make of that???
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Old 10-26-2007, 05:56 PM   #6
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I was just in my garage trying to clean the IAC sensor but I couldn't get one screw off. Ended up stripping it So I just cleaned out the TB and shot carb cleaner into the openings for the IAC. Didn't make much of a difference though. Are you supposed to take off the sensor with the two screws covered in sealant and clean in there as well? I didn't do that because the directions in that link don't exactly spell out the procedure step by step....
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Old 10-26-2007, 06:22 PM   #7
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I hate EGR... lets just take inert exhaust gas and put it back into the intake to lower emmissions... its not like it hurts anything, other than creating excessive carbon buildup, less powerful combustion, less efficient compression, a slightly scewed AFR micture... nothing like that.
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Old 10-26-2007, 06:33 PM   #8
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Originally Posted by mjwalfredo View Post
I was just in my garage trying to clean the IAC sensor but I couldn't get one screw off. Ended up stripping it So I just cleaned out the TB and shot carb cleaner into the openings for the IAC. Didn't make much of a difference though. Are you supposed to take off the sensor with the two screws covered in sealant and clean in there as well? I didn't do that because the directions in that link don't exactly spell out the procedure step by step....
Here's what I wrote up for cleaning it.
http://www.ultimateyota.com/index.ph...27963#msg27963

You really need to get those 4 screws out to clean it properly.
Drill off the head on the stripped screw, clean the IAC and replace with a new screw.
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Old 10-26-2007, 06:34 PM   #9
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Next question.. I have seen a lot of talk about cleaning the MAF sensor, but my truck has a MAP sensor. What do you make of that???
I'd say it was total bullox.
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Old 10-26-2007, 06:38 PM   #10
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Well my sensor looks nothing like the ones that I have seen on the MAF sensor right ups?? It does not screw into the intake like others do, its is just one solid piece of intake piping with a connector on it. I'll try and get a picture of it tomorrow because I'm so flippin confused.

It doesn't look like this....


Last edited by trd_4runnin11; 10-26-2007 at 06:43 PM.
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Old 10-26-2007, 06:44 PM   #11
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Well my sensor looks nothing like the ones that I have seen on the MAF sensor right ups?? It does not screw into the intake like others do, its is just one solid piece of intake piping with a connector on it. I'll try and get a picture of it tomorrow because I'm so flippin confused.
I know exactly what it looks like and it is a MAF sensor too.....I have the same one on mine. They changed the MAF in 99 to be more easily replaceable (like the ones you've been seeing in writeups).

This should help:
http://4runners.org/writeups/throttle/index.html

More pics of your type of MAF:
http://www.ultimateyota.com/index.ph...11166#msg11166

Here's what to clean it with:
http://www.ultimateyota.com/index.ph...6&topic=1033.0

Last edited by MTL_4runner; 10-26-2007 at 06:50 PM.
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Old 10-26-2007, 06:58 PM   #12
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So this is in fact a MAF sensor. Thanks so much for all of your help. If you were closer and I were 21 I'd buy you a case of beer!
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Old 10-26-2007, 07:08 PM   #13
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So this is in fact a MAF sensor.
Yes, it is.
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Old 10-27-2007, 05:08 AM   #14
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Originally Posted by MTL_4runner View Post
Here's what I wrote up for cleaning it.
http://www.ultimateyota.com/index.ph...27963#msg27963

You really need to get those 4 screws out to clean it properly.
Drill off the head on the stripped screw, clean the IAC and replace with a new screw.
Thanks, you are the man Jamie! My dang truck is idling at just over 500 RPMs right now. I really hope this helps.
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Old 02-10-2011, 12:37 PM   #15
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Thanks for the heads up on the IAC. My 96 has been giving me all the same issues. Will give it a shot.
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02, 2000, 2002, 34, 34l, cleaning, egr, iac, located, location, photo, screw, stripped, tacoma, totota, toyota, valve

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