How does the EGR 'sense' insufficient flow (P401 code)?? (1 Viewer)

[RavenTai]

That's what I figured. Now, there are 2 VSV's, aren't there? A VSV for EGR and a VSV for....?


I did replace my VSV for EGR, but I have NOT replaced the hoses, nor have I checked the temp sensor.

actually 3, EGR at the back, fuel pressure regulator at the front, and purge in th middle

you can see all three in the pic a few pages up

 

[MDarius]

Thnx!

 

[kerrye]

This is an old thread, but just for the record, I tested the temp sensor on my 93 and resistance was infinite, showing there was no connection between the wires. I also had a bad diaphragm in the EGR valve, a bad modulator (at one time) and possibly a bad VSV so I can't say if replacing the temp sensor alone would get ride of a Code 71.

 

[Darb]

I bought 1 gallon of sea-foam and put half in 1 tank of gas and half in a second tank. Shortly before the second tank ran out my CEL went off and has not come back on in 11 months and almost 5k miles. Am I really lucky?