Pickup wont pass smog

staticx54621 · 08-18-2008, 09:09 PM

i have a 1985 22r federal model. ive taken this truck to the smog station a few times and fail due to egr non funtional. all my exhaust tests are fine. so i was thinking if there is a different type of egr valve on the federal models. i know there is a negative back-pressure(which you have to plug the exhaust and then do the vac test.) ond the positive-pressure (where you just apply the vac.) Does anyone have experience with this same model. Thanks in advance for any help

staticx54621 · 08-19-2008, 04:22 PM

anyone??????

myyota · 08-19-2008, 09:12 PM

Have you tryed removing the egr valve and clean it out ?, they can plug up with carbon and not work, also check all of the vacuum lines going to the egr and make sure there good. some trucks also have a vacuum modulator (i think thats what its called) that controls the vacuum going to the egr, if it goes bad the egr can either not get enough vacuum to operate or can get to much vacuum, depending on how it went bad.

pcmentor · 08-19-2008, 11:20 PM

On my 85 22re the EGR is attached to hoses/piping which lead to the thermo switchvalve. My piping was corroded and blocked so I replaced with hoses. You have to make sure the EGR valve, EGR Modulator, and thermovalve are plumbed correctly. Ask the mechanic if the EGR failed because there was no vacuum at the EGR Valve or if the EGR valve is stuck open.

staticx54621 · 08-20-2008, 12:07 AM

i put a new egr valve on there after my first smog test. and all the hoses are routed correctly. but i havent tested the thermo valve yet. ill do that today. but what i am still wondering is if the federal model is a negative back-pressure egr valve.

landozion · 08-20-2008, 10:20 AM

Pages EC 30-33 of the FSM (available here http://www.ncttora.com/fsm/1985/1985FSM.pdf )gives the testing procedure for the EGR, and the vacuum routing so you can answer your question. It is fairly common for the plumbing to become totally packed with carbon. Might be worth your time to remove the piping and clean it.

pcmentor · 08-20-2008, 09:13 PM

Does anyone else have egr vacuum metal piping clogged with gunk/rust? The four little metal piping welded together. Is the problem that the vauum isn't getting to the EGR valve?

yotaman_79 · 08-22-2008, 07:50 PM

i do have that 4 little metal pices i would like to take them off but i dont know how it will harm the motor. i would like to have a clean looking motor
dont know if i should do it or not could use some help too

pcmentor · 08-23-2008, 06:07 PM

Blow air through them to see if they are clogged. If so replace with rubber hose.

littlecommando · 09-01-2008, 07:40 PM

I thought that 1985 was old enough to not have to pass test

pcmentor · 09-01-2008, 07:58 PM

In CA it's 1975 and older.

08-18-2008, 09:09 PM	#1 (permalink)
staticx54621 Registered User Join Date: Nov 2007 Posts: 31	Pickup wont pass smog i have a 1985 22r federal model. ive taken this truck to the smog station a few times and fail due to egr non funtional. all my exhaust tests are fine. so i was thinking if there is a different type of egr valve on the federal models. i know there is a negative back-pressure(which you have to plug the exhaust and then do the vac test.) ond the positive-pressure (where you just apply the vac.) Does anyone have experience with this same model. Thanks in advance for any help

09-01-2008, 07:40 PM	#10 (permalink)
littlecommando Registered User Join Date: May 2008 Posts: 365	I thought that 1985 was old enough to not have to pass test __________________ 1985 Toyota 4Runner SR5 4WD red, mostly stock, mossy oak seat covers, custom stereo system, Dixie Horn, Custom Rear Bumper Build Up Powder Springs, Georgia

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
exhaust running to lean. wont pass smog	weakyota91	86-95 Trucks & 4Runners	14	05-17-2007 12:36 PM
Think this cam would pass smog?	JEDI87	86-95 Trucks & 4Runners	4	04-26-2007 09:18 AM
cant pass smog 3.Slow	jandk2005	86-95 Trucks & 4Runners	38	05-21-2006 11:31 AM
help me pass CA smog test please	2wd1stgen	95.5-2004 Tacomas & 96-2002 4Runners	9	06-05-2004 07:43 PM
Please help pass CA smog test	crznL98	95.5-2004 Tacomas & 96-2002 4Runners	3	12-18-2003 11:23 AM

08-19-2008, 04:22 PM	#2 (permalink)
staticx54621 Registered User Join Date: Nov 2007 Posts: 31	anyone??????

08-19-2008, 09:12 PM	#3 (permalink)
myyota Registered User Join Date: Oct 2006 Location: San Pablo, CA Posts: 600	Have you tryed removing the egr valve and clean it out ?, they can plug up with carbon and not work, also check all of the vacuum lines going to the egr and make sure there good. some trucks also have a vacuum modulator (i think thats what its called) that controls the vacuum going to the egr, if it goes bad the egr can either not get enough vacuum to operate or can get to much vacuum, depending on how it went bad.

08-19-2008, 11:20 PM	#4 (permalink)
pcmentor Registered User Join Date: Jul 2006 Posts: 111	On my 85 22re the EGR is attached to hoses/piping which lead to the thermo switchvalve. My piping was corroded and blocked so I replaced with hoses. You have to make sure the EGR valve, EGR Modulator, and thermovalve are plumbed correctly. Ask the mechanic if the EGR failed because there was no vacuum at the EGR Valve or if the EGR valve is stuck open.

08-20-2008, 12:07 AM	#5 (permalink)
staticx54621 Registered User Join Date: Nov 2007 Posts: 31	i put a new egr valve on there after my first smog test. and all the hoses are routed correctly. but i havent tested the thermo valve yet. ill do that today. but what i am still wondering is if the federal model is a negative back-pressure egr valve.

08-20-2008, 10:20 AM	#6 (permalink)
landozion Registered User Join Date: Aug 2007 Location: utah Posts: 29	Pages EC 30-33 of the FSM (available here http://www.ncttora.com/fsm/1985/1985FSM.pdf )gives the testing procedure for the EGR, and the vacuum routing so you can answer your question. It is fairly common for the plumbing to become totally packed with carbon. Might be worth your time to remove the piping and clean it.

08-20-2008, 09:13 PM	#7 (permalink)
pcmentor Registered User Join Date: Jul 2006 Posts: 111	Does anyone else have egr vacuum metal piping clogged with gunk/rust? The four little metal piping welded together. Is the problem that the vauum isn't getting to the EGR valve?

08-22-2008, 07:50 PM	#8 (permalink)
yotaman_79 Registered User Join Date: Aug 2008 Location: Lacygne Kansas Posts: 4	i do have that 4 little metal pices i would like to take them off but i dont know how it will harm the motor. i would like to have a clean looking motor dont know if i should do it or not could use some help too

08-23-2008, 06:07 PM	#9 (permalink)
pcmentor Registered User Join Date: Jul 2006 Posts: 111	Blow air through them to see if they are clogged. If so replace with rubber hose.

09-01-2008, 07:58 PM	#11 (permalink)
pcmentor Registered User Join Date: Jul 2006 Posts: 111	In CA it's 1975 and older.