Notices
Newbie Tech Section Often asked technical questions can be asked here

EGR mystery

Old 02-09-2019, 03:17 PM
  #1  
Registered User
Thread Starter
 
Join Date: Nov 2018
Posts: 61
Thanked 1 Time in 1 Post
EGR mystery

As i continue to try to make sense of what my 3VZE runners PO has done to this truck, I noticed the EGR valve is missing a connector. I discovered it is the egr temperature sensor. At first I thought they might have tried to do some hack job Egr delete but itís still on the vehicle (just missing the sensor connector).

Question is this some sort of egr mod that youíve seen before? Or do I need to reconnect a temp sensor wire? I am imagine this could cause performance issues.

Last edited by gilesitis; 02-09-2019 at 04:31 PM.
gilesitis is offline  
Old 02-09-2019, 06:02 PM
  #2  
Registered User
 
Join Date: Aug 2013
Location: Southern Arizona
Posts: 2,881
Thanked 35 Times in 32 Posts
You don't say what year your truck is and whether it is federal or cali spec. Not all emissions regimes used an egr temp sensor.

Don't think the temp sensor actually exerts any control, but only lights check engine light and sets code if low temp indication shows that there is no egr flow when the ECM says that there should be flow.

You got a wiring harness plug and no sensor on the egr, or you got a sensor on egr and no harness plug???
millball is offline  
Old 02-09-2019, 06:07 PM
  #3  
Registered User
Thread Starter
 
Join Date: Nov 2018
Posts: 61
Thanked 1 Time in 1 Post
Originally Posted by millball View Post
You don't say what year your truck is and whether it is federal or cali spec. Not all emissions regimes used an egr temp sensor.

Don't think the temp sensor actually exerts any control, but only lights check engine light and sets code if low temp indication shows that there is no egr flow when the ECM says that there should be flow.

You got a wiring harness plug and no sensor on the egr, or you got a sensor on egr and no harness plug???
1988 model and I donít believe itís Cali specific. It has been in the southeast since the dealership.

i donít have the sensor on the egr and I could not find a vacant harness plug
gilesitis is offline  
Old 02-09-2019, 06:21 PM
  #4  
Registered User
 
Join Date: Aug 2013
Location: Southern Arizona
Posts: 2,881
Thanked 35 Times in 32 Posts
I don't think your '88 truck ever had an egr temp sensor.

I've got a '92 FED/CANADA spec 3vz that has NO egr temp sensor and I have a '95 FED/CANADA spec 3vz that DOES have the temp sensor. Both are 4Runners.
millball is offline  
Old 02-09-2019, 06:23 PM
  #5  
Registered User
Thread Starter
 
Join Date: Nov 2018
Posts: 61
Thanked 1 Time in 1 Post
Originally Posted by millball View Post
I don't think your '88 truck ever had an egr temp sensor.

I've got a '92 FED/CANADA spec 3vz that has NO egr temp sensor and I have a '95 FED/CANADA spec 3vz that DOES have the temp sensor. Both are 4Runners.
I think this mystery is solved, thank you. I also just read something that supports the temp sensor is only for Cali spec.

Do you you know how I could check to see if the egr valve is stuck?
gilesitis is offline  
Old 02-09-2019, 06:31 PM
  #6  
Registered User
 
Join Date: Aug 2013
Location: Southern Arizona
Posts: 2,881
Thanked 35 Times in 32 Posts
With the engine idling, apply vacuum to the egr valve diaphragm[COLOR=left=#666666] and the engine should run very rough, or even stall.

This proves egr function. A valve stuck partially open often causes rough idle,[/COLOR]

Last edited by millball; 02-09-2019 at 06:32 PM.
millball is offline  
Old 02-09-2019, 06:33 PM
  #7  
Registered User
Thread Starter
 
Join Date: Nov 2018
Posts: 61
Thanked 1 Time in 1 Post
Originally Posted by millball View Post
With the engine idling, apply vacuum to the egr valve [color=left=#666666]diaphragm and the engine should run very rough, or even stall.

This proves egr function. A valve stuck partially open often causes rough idle,[/color]
Thanks, not sure how to do that, but Iíll keep researching it.
gilesitis is offline  
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
jyama99
86-95 Trucks & 4Runners
15
01-05-2012 10:26 PM
agentmantis
Newbie Tech Section
0
07-14-2010 04:58 AM
pendrag
95.5-2004 Tacomas & 96-2002 4Runners
0
04-16-2010 03:43 PM
pendrag
95.5-2004 Tacomas & 96-2002 4Runners
0
04-07-2010 01:23 PM
qdude79
86-95 Trucks & 4Runners
13
07-02-2008 03:36 PM


Thread Tools
Search this Thread
Quick Reply: EGR mystery


Contact Us Archive Advertising Cookie Policy Privacy Statement Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
 
  • Ask a Question
    Get answers from community experts
Question Title:
Description:
Your question will be posted in: