Code 71 EGR problem

[SiberianTundra]

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?
Thanks

[Kep]

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.

Kep

[boi_si]

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.

[white90dx]

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.

-Charlie

[Kep]

It's a heavy read and for a newer model but alyce did a lot of testing for her/his camry. Read egr 0401 code diagnosis 97camry

Kep