EGR malfunction code 71?

Silverunner · 12-24-2006, 02:15 PM

The check engine light is showing its a code 71 for EGR system. I've replaced the EGR valve with another used one, checked all grounds that I could think of and checked for any vaccum leaks which I didn't find any. Check engine light still comes on.

The as reed valve does make a loud scratching sound, but I'm not sure if its supposed to though.

What else could be the problem for egr?
Thanks, Steven

Silverunner · 12-26-2006, 07:18 PM

Anyone have any ideas?

Guardian_Saint · 12-26-2006, 08:30 PM

http://i137.photobucket.com/albums/q.../IMG_01482.jpg

http://i137.photobucket.com/albums/q...j/IMG_0149.jpg

WillRadford · 01-18-2007, 11:05 AM

I just had a 71 code read in my 94 4runner 3.0 today and Im determining what to do. Im wondering what Guardian_Saint was doing in those pics on his post. Why are those yellow caps where the vaccume line should be?

95SlowRunner · 01-18-2007, 12:36 PM

Quote:

Originally Posted by WillRadford

I just had a 71 code read in my 94 4runner 3.0 today and Im determining what to do. Im wondering what Guardian_Saint was doing in those pics on his post. Why are those yellow caps where the vaccume line should be?

Check your vacum lines first for any leaks, particularly if you have pulled your engine or done any work requiring removing those vacum lines. I had the same code from after rebuilding my engine in my '95. It turned out that I swapped two vacum lines around but luckly my '89 has a 3.0 as well so I had something to compare it to and was able to find the problem.

thook · 01-18-2007, 01:50 PM

Quote:

Originally Posted by WillRadford

I just had a 71 code read in my 94 4runner 3.0 today and Im determining what to do. Im wondering what Guardian_Saint was doing in those pics on his post. Why are those yellow caps where the vaccume line should be?

I think he's suggesting bypassing the EGR in a subtle way. It's an option if it's legal in your state. There are plenty threads on it. I did it to both my 4rnrs. One of them, I didn't have much of a choice....limited by EGR valve funding.

^VooDoo^ · 01-18-2007, 02:38 PM

Heres a way to test from the top of the egr system.
1st while the engine is idling using the hose going to the EGR dashpot, Suck on it, If the engine dies and you cant keep sucking air through it then the dashpot is good.
2nd the green vsv cellonoid over on the passenger fender is working ok, You can do a suck on test to see if its opening and closing right, I think the valve closes on a throttle decel.

If both of those are good then its the little black plastick disk thingy at teh front of the engine with all the hoses going into it. (It gets plugged with water and carbon sometimes)
Or the heat sensor has bad, Thats the one with the 2 wires coming out the side of the egr tube below the dashpot.

I think its the little black plastic thingy if the first 2 checks are good.

thook · 01-18-2007, 02:51 PM

Black plastic thingy....vacuum modulator...

jasonbrink · 01-18-2007, 06:17 PM

I went through this for a couple years and just drove it with the light on, right up until a few weeks ago when I had finally had enough of that orange glow. I had to fix the real culprit (of mine).
Mine didn't have the egr temp. sensor, being from NY. My vehicle had over 200k on it, I figured something must have worn out.
So, just like the DEALER does, I just threw parts at it. I replaced the vacuum modulator, which really wasn't working right. Light came back on after about 30 miles. I replaced the egr valve with a checked used one, the old one did seem to function correctly, I replaced it anyway-light came back on in a day. Christ, I went as far as getting a new TPS and fiddling with that for a week.
THEN-
I went through the FSM doing every egr test to find the problem. Everything was fine. I couldn't figure it out.
UNTIL I found a test I didn't try before. I'm not sure why I didn't. It was for the VSV. The VSV (vacuum switching valve) was the cause of my two year code 71. I felt sooo dumb. There is a test in the FSM for this, which I can post. I have all the PDF's from the toyota.com site. I spemt a whole day at work doing it! In fact I'll post all of the tests for future searches for "code 71"
Try all these tests and do yourself a favor & go to autozone (or whatever part store near you that loans tools & get a vacuum pump like this: http://www.autozone.com/in_our_store...acuum_pump.htm
It makes it so much easier on your lungs, plus you know you are pulling enough vacuum-you can be more positive of your testing. PLUS, it's free! (if you return it)
I'll find those pdf.s now

jasonbrink · 01-18-2007, 10:02 PM

Do all these tests& you should be able to find whatever is messed up- Here:
http://personal.utulsa.edu/~nathan-b...ne/19egrsy.pdf

Snorkeldepth · 01-19-2007, 01:49 PM

My Code 71 problem was a clogged EGR VSV. Pull off your VSV and take a look at it. The metal pipes that connect the vacum lines running over the front/top of the engine can corrode on the inside and when the corrosion breaks loose it clogs the VSV. I could see the clogged VSV port when I removed my VSV.

If you search "Code 71" you'll find my story and others as well.

12-24-2006, 02:15 PM	#1 (permalink)
Silverunner Registered User Join Date: May 2006 Location: TN Posts: 48	EGR malfunction code 71? The check engine light is showing its a code 71 for EGR system. I've replaced the EGR valve with another used one, checked all grounds that I could think of and checked for any vaccum leaks which I didn't find any. Check engine light still comes on. The as reed valve does make a loud scratching sound, but I'm not sure if its supposed to though. What else could be the problem for egr? Thanks, Steven __________________ '92 4runner V6 auto '92 civic hatchback -DD

12-26-2006, 07:18 PM	#2 (permalink)
Silverunner Registered User Join Date: May 2006 Location: TN Posts: 48	Anyone have any ideas? __________________ '92 4runner V6 auto '92 civic hatchback -DD

12-26-2006, 08:30 PM	#3 (permalink)
Guardian_Saint Registered User Join Date: Jun 2006 Location: California Posts: 358	http://i137.photobucket.com/albums/q.../IMG_01482.jpg http://i137.photobucket.com/albums/q...j/IMG_0149.jpg __________________ My Rig - 1992 TOYOTA 4RUNNER, 3VZE V6, R150 5 Speed Transmission (5 Speed Swap, running on AUTO ECU & Wire Harness) 4x4, ( 219,000 miles ) all bonestock. Replace HG at 215,000 miles ( MLS HG). 1992 Toyota 4runner V6 A/T ECU/ECM for sale, part # 89661-35770, asking price at $150.00 USD. Free Shipping in the US. Last edited by Guardian_Saint : 12-27-2006 at 07:44 PM.

01-18-2007, 02:38 PM	#7 (permalink)
^VooDoo^ Contributing Member Join Date: Mar 2006 Location: Alhambra CA. Posts: 393	Heres a way to test from the top of the egr system. 1st while the engine is idling using the hose going to the EGR dashpot, Suck on it, If the engine dies and you cant keep sucking air through it then the dashpot is good. 2nd the green vsv cellonoid over on the passenger fender is working ok, You can do a suck on test to see if its opening and closing right, I think the valve closes on a throttle decel. If both of those are good then its the little black plastick disk thingy at teh front of the engine with all the hoses going into it. (It gets plugged with water and carbon sometimes) Or the heat sensor has bad, Thats the one with the 2 wires coming out the side of the egr tube below the dashpot. I think its the little black plastic thingy if the first 2 checks are good. __________________ My peace 92 4Runner 4x4, 3vze, 5spd, 300k+, 265x75x16 4.56 And no HG done, Yet.

01-18-2007, 06:17 PM	#9 (permalink)
jasonbrink Registered User Join Date: Jun 2004 Location: Pine City, NY Posts: 73	I went through this for a couple years and just drove it with the light on, right up until a few weeks ago when I had finally had enough of that orange glow. I had to fix the real culprit (of mine). Mine didn't have the egr temp. sensor, being from NY. My vehicle had over 200k on it, I figured something must have worn out. So, just like the DEALER does, I just threw parts at it. I replaced the vacuum modulator, which really wasn't working right. Light came back on after about 30 miles. I replaced the egr valve with a checked used one, the old one did seem to function correctly, I replaced it anyway-light came back on in a day. Christ, I went as far as getting a new TPS and fiddling with that for a week. THEN- I went through the FSM doing every egr test to find the problem. Everything was fine. I couldn't figure it out. UNTIL I found a test I didn't try before. I'm not sure why I didn't. It was for the VSV. The VSV (vacuum switching valve) was the cause of my two year code 71. I felt sooo dumb. There is a test in the FSM for this, which I can post. I have all the PDF's from the toyota.com site. I spemt a whole day at work doing it! In fact I'll post all of the tests for future searches for "code 71" Try all these tests and do yourself a favor & go to autozone (or whatever part store near you that loans tools & get a vacuum pump like this: http://www.autozone.com/in_our_store...acuum_pump.htm It makes it so much easier on your lungs, plus you know you are pulling enough vacuum-you can be more positive of your testing. PLUS, it's free! (if you return it) I'll find those pdf.s now __________________ 1992 4runner v6, A/T, A/C, bone stock & stayin that way for a couple more years. 1992 Pickup-Lifted, 33" tires, not much else..... 250K miles & climbing. Not ONE stinkin' problem with it yet. Not even head gasket.

01-18-2007, 11:05 AM	#4 (permalink)
WillRadford Contributing Member Join Date: Jun 2006 Location: Bountiful, UT Posts: 145	I just had a 71 code read in my 94 4runner 3.0 today and Im determining what to do. Im wondering what Guardian_Saint was doing in those pics on his post. Why are those yellow caps where the vaccume line should be?

01-18-2007, 10:02 PM	#10 (permalink)
jasonbrink Registered User Join Date: Jun 2004 Location: Pine City, NY Posts: 73	Do all these tests& you should be able to find whatever is messed up- Here: http://personal.utulsa.edu/~nathan-b...ne/19egrsy.pdf __________________ 1992 4runner v6, A/T, A/C, bone stock & stayin that way for a couple more years. 1992 Pickup-Lifted, 33" tires, not much else..... 250K miles & climbing. Not ONE stinkin' problem with it yet. Not even head gasket.

01-19-2007, 01:49 PM	#11 (permalink)
Snorkeldepth Contributing Member Join Date: Aug 2005 Location: Orange County, California Posts: 602	My Code 71 problem was a clogged EGR VSV. Pull off your VSV and take a look at it. The metal pipes that connect the vacum lines running over the front/top of the engine can corrode on the inside and when the corrosion breaks loose it clogs the VSV. I could see the clogged VSV port when I removed my VSV. If you search "Code 71" you'll find my story and others as well. __________________ 1990 SR5 V6 Standard Cab Short Bed 4X4 5 Speed

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