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Code 71 EGR problem

4346 Views 9 Replies 7 Participants Last post by  66conv6
Hi All,

I had a trouble code 71 and researched it to an EGR problem on my 1990 Camry with a 3S-FE. Yesterday I pulled off the EGR and it was almost totally plugged up with carbon deposits. So I cleaned out the EGR valve, cleaned out the port on the other side where it attaches to, checked the tube that goes from the EGR valve to the engine block/cylinder head, cleaned out the other disc the vacuum hoses attaches to, and then after driving an hour today, the check engine light comes on and it is code 71 again!

Can anyone tell me what I missed?
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Check inside the vacuum hoses connecting the modulator valve to the EGR valve, especially the lower one. Mine was clogged up also. Then establish that your vacuum readings are correct.

Another thought, if you left scraps of carbon in that veritcle tube it may have blown back into the EGR valve and jammed somehow.

im having problems on my celica as well. when i apply vaccum to the valve the engine wont stall. this i will fail functional test in california.. but my sniff test pass last yr.
You will also want to test the EGR temp sensor to make sure it is within spec. Did you remember to plug it back in? ;)

There is also a chance that the head has plugged up with carbon too.

It's a heavy read and for a newer model but alyce did a lot of testing for her/his camry. Read

1990 Toyota Camry 4cyl EGR Code 71

I have a 1990 Toyota Camry 4cyl with 151K miles that the Check Engine light came on in. Runs fine, no noticeable loss of power. The light goes off typically after I fuel up, but then comes on again. I have replaced the gas cap and that did not solve the problem. OBD code is 71 for EGR System. Would it be correct to say I should clean or replace the EGR valve and/or sensor? Would you clean or just replace?
First thing to do is apply vacuum to the EGR valve, doing so should cause the engine to run rough or stall. Try this and report back.
Novice Mechanic

As a garage-novice mechanic, how would I apply vacuum to the EGR valve? I have seen several posts/videos on how to clean it, but none on troubleshooting further. Thank you for your guidance.
Suck on the vacuum hose going to the EGR valve, or get a T fitting with some spare line and tap into a vacuum port on the back of the intake. I'll take some pics if you still don't get the jist of what I'm saying.
I just put a new one in and problem solved for a bunch more years of smog testing in California. Isn't there a diaphragm that often goes bad?
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