YotaTech Forums  

Go Back   YotaTech Forums > Toyota SUV & Truck Tech > 86-95 Trucks & 4Runners
Sign in using an external account
Register Forgot Password?
Search


86-95 Trucks & 4Runners 2nd/3rd gen pickups, and 1st/2nd gen 4Runners with IFS

Welcome to Yotatech!
Welcome to Yotatech,

You are currently viewing our forum as a guest, which gives you limited access to view most discussions and access our other features. By joining our community, at no cost, you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is free, fast and simple, so please join our community today!


Reply
 
LinkBack Thread Tools Search this Thread
Old 05-22-2010, 06:54 PM   #1 (permalink)
Registered User
Personal Sales Rating: (0)
 
wrenchtech's Avatar
 
Join Date: Apr 2006
Location: S.E. Wisconsin
Posts: 189
Bad EGR Valve: What Symptoms (3vze)?

I know what the factory manual says, but I wanted to hear from someone who's experienced it. If it was stuck open so that it was letting exhaust gas into the intake manifold all the time how would the engine run? -- Matt
This ad is not displayed to registered members.
Register your free account today and become a member on Yotatech!
__________________
'89 4runner SR5 , 3.0, A/T
'93 Pickup Dlx, 3.0, 5 spd
wrenchtech is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiTweet this Post!
Reply With Quote
Old 05-22-2010, 07:02 PM   #2 (permalink)
Registered User
Personal Sales Rating: (0)
 
Scenic WonderRunner's Avatar
 
Join Date: May 2010
Location: San Diego, CA
Posts: 85
If you have a bad EGR Valve, you will have "High NOX" and not pass emissions, at least in California.

It's a cheap part and easy to replace yourself.

http://www.aa1car.com/library/egr.htm




.
Scenic WonderRunner is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiTweet this Post!
Reply With Quote
Old 05-22-2010, 07:41 PM   #3 (permalink)
Registered User
Personal Sales Rating: (0)
Threadstarter [OP]
 
wrenchtech's Avatar
 
Join Date: Apr 2006
Location: S.E. Wisconsin
Posts: 189
In the factory manual it says that it will cause low power when the engine is cold. An open EGR is in effect a vacuum leak. I've got terrible low power when cold that improves a lot when the engine is thoroughly warmed up. And idle vac is a little low at 15 ". Sound familiar to anybody? -- Matt
__________________
'89 4runner SR5 , 3.0, A/T
'93 Pickup Dlx, 3.0, 5 spd
wrenchtech is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiTweet this Post!
Reply With Quote
Old 05-22-2010, 08:15 PM   #4 (permalink)
Registered User
Personal Sales Rating: (1)
 
Join Date: Jun 2009
Posts: 271
Uh I'm pretty sure you can plug the egr vacuum lines and if the performance improves, then you found your problem. I would research that a bit more before trying it.
bend is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiTweet this Post!
Reply With Quote
Old 05-22-2010, 08:37 PM   #5 (permalink)
Registered User
Personal Sales Rating: (0)
Threadstarter [OP]
 
wrenchtech's Avatar
 
Join Date: Apr 2006
Location: S.E. Wisconsin
Posts: 189
I disabled the vac line to the EGR valve, it didn't change anything. If the main exhaust passage of the EGR is stuck open vacuum lines won't change anything. -- Matt
__________________
'89 4runner SR5 , 3.0, A/T
'93 Pickup Dlx, 3.0, 5 spd
wrenchtech is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiTweet this Post!
Reply With Quote
Old 05-23-2010, 05:32 AM   #6 (permalink)
Registered User
Personal Sales Rating: (0)
 
Arkman's Avatar
 
Join Date: Mar 2010
Location: Northeast Arkansas
Posts: 24
I plugged my egr vac lines and it runs like a champ now and dont have a regret in the world about doing it. lol
Arkman is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiTweet this Post!
Reply With Quote
Old 05-23-2010, 08:11 PM   #7 (permalink)
Registered User
Personal Sales Rating: (0)
Threadstarter [OP]
 
wrenchtech's Avatar
 
Join Date: Apr 2006
Location: S.E. Wisconsin
Posts: 189
There's a lot to the EGR system. There's the Valve itself, the modulator, a vacuum switching valve, and some interaction with the ECU and the throttle body. I can see why a person might want to pass on trying to figure it out and fix it right.

In any case I pulled the valve off today and found that it is not stuck in the open position. While it was off I plugged the EGR port on the intake manifold. The result was that eliminating the EGR valve made no difference for my problem. I'm starting to think that the valve timing is off by one tooth on the timing belt.

The last owner had a head gasket repair done right before he sold the vehicle to me. He was an Army recruiter. Part of his job involved hanging out at the area high schools. He ended up letting the vo-tech automotive class do the job. I'm starting to think they didn't get the timing belt on right. That ought to be easy enough to determine. -- Matt
__________________
'89 4runner SR5 , 3.0, A/T
'93 Pickup Dlx, 3.0, 5 spd
wrenchtech is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiTweet this Post!
Reply With Quote
Old 05-24-2010, 01:24 PM   #8 (permalink)
Registered User
Personal Sales Rating: (0)
 
Join Date: May 2009
Location: BC Man!
Posts: 70
Hmm, I have bad/low power/surging/struggling issues when the engine is cold but they pretty much go away once its fully warmed up.
Might look at the EGR valve also
__________________
94 4runner, 3vze 5spd, with too many miles
Fishaa is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiTweet this Post!
Reply With Quote
Old 05-24-2010, 03:39 PM   #9 (permalink)
Registered User
Personal Sales Rating: (0)
 
sb5walker's Avatar
 
Join Date: Jan 2008
Location: Connecticut
Posts: 1,087
EGR keeps combustion temps down. Given that high temps in cyl 6 already causes a lot of head gasket failures on that motor, it would probably be a good idea to make sure it's working correctly. EGR does not operate at full throttle, so it doesn't impact power. It actually improves gas mileage by a small amount. In keeping combustion temps down it not only protects the head gaskets from blowing and valves from burning, it also fights pinging which can cause the ecu to retard timing (which decreases power). And nitrogen oxides are the nastiest components of smog - they're the ones that burn your eyes.
__________________
1989 V6 4x4 X-Cab 5spd 288k miles, Borla cat-back, K&N Filtercharger, 30x9.5 Bridgestone Dueler A/T REVOs
sb5walker is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiTweet this Post!
Reply With Quote
Old 05-24-2010, 04:03 PM   #10 (permalink)
Registered User
Personal Sales Rating: (3)
 
vasinvictor's Avatar
 
Join Date: Jun 2008
Location: North Central, AR
Posts: 1,331
i quit sounds dirty not even once atari pong toyota
Quote:
Originally Posted by sb5walker View Post
EGR keeps combustion temps down. Given that high temps in cyl 6 already causes a lot of head gasket failures on that motor, it would probably be a good idea to make sure it's working correctly. EGR does not operate at full throttle, so it doesn't impact power. It actually improves gas mileage by a small amount. In keeping combustion temps down it not only protects the head gaskets from blowing and valves from burning, it also fights pinging which can cause the ecu to retard timing (which decreases power). And nitrogen oxides are the nastiest components of smog - they're the ones that burn your eyes.
I knew Toyota thought it was a good idea for some reason! Well said.
__________________
-Drew

1995 4Runner 4x4 | 3.4 5vz|a340f auto swap | Holset hx35 rear turbo @ 14lb | Transgo 340-HD2 valvebody | Walbro 255 | Coolingmist Autolearn meth injection @ ~22gph | Inchworm Adapter | rf1a case | 4.10 | Lock Right rear | non ADD swap | Aisin hubs | 1.5" BL | 245/75/16 Firestone Destination A/T
vasinvictor is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiTweet this Post!
Reply With Quote
Old 09-19-2010, 06:51 PM   #11 (permalink)
Registered User
Personal Sales Rating: (0)
 
BeenYota's Avatar
 
Join Date: Dec 2009
Location: Minnesota, USA
Posts: 94
And I was just going to pull mine since it failed tonight. Anyone have a working/reconditioned assembly full components for sale?

Thanks,
__________________
92 4Runner SR5 4WD
BeenYota is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiTweet this Post!
Reply With Quote
Old 09-19-2010, 06:51 PM
Yotatech
4WD Truck




Paid Advertisement
Reply

Tags
30, 3vze, 4runner, 94, bad, clean, egr, open, scenic, stuck, switching, symptoms, toyota, v6, vacuum, valve, vsv

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -8. The time now is 06:40 PM.


2010 InternetBrands, Inc.

Search Engine Friendly URLs by vBSEO 3.5.2