2000 Rodeo code P0401

[mkorn]

Is this the issue even if I feel some suction from the intake?

This would be awesome if this worked. my state requires emissions and I have had to delay renewing my registration b/c my emissions won't pass.

Thanks for any help

[trev0006]

Thanks for posting this, I had the same problem and your post helped us out.

Originally Posted by 2eyefishclaw

the problem you have is very common the problem is insufficient flow. When the EGR valve opens it allows ehaust gasses to recirculate through the engine. If the EGR vacuum port is restricted which it probably is, it will cause this concern.
HOW TO FIX
1 : remove the EGR valve
there are 2 holes the larger one is the one that supplies exhaust
flow dont worry about it. the other is a vacuum port this is
where exhaut gases are directed when the EGR valve opens carbon
carbon deposits srick to the walls of the vacuum port and in time
wil restrict flow normally about 30,000 miles
2: Check your local dealer for Intake cleaner ask about BG products
all you will need is the intake cleaner (spray can)
find something to plug the larger hole make sure it will not vibrate
and fall out there wil be slight exhaust pressure on it but not much
just be sure it is plugged real well because if not you may be
suprisied by a flame. Once plugged start the cars, spray intake
cleaner into the vacuum port you may have to raise the idle to do
or just open the throttle by hand spray untill the can is empty.
3 : check your EGR valve push the pintle on the bottom be sure it
moves in and out freely if not clean it dont replace the valve once
the pintle moves as it should reinstall the EGR valve disconnect
battery for a few minutes or have code cleared
I assure you if you do this it will take care tires of your problem I do this often sometimes 3-4 times a day and it always works

[Matt32]

Can this problem also cause poor Mpg's? I recieve a P0401 code occasionally, but it usually goes away before I get to cleaning it. Then it comes back a month later. My Mpg's though, have dropped to 12-14. Could this be the problem?

[brownM091298]

I would like to Thank 2eyefishclaw for the entry here and others who tried it for their input. I know this is an old post but I just found my problem because of this post!! I took off my EGR valve and found that the pinion was locked up and very black. I tried to lube it as was suggested and it just would not free up. So, after replacing the part I have reset the CEL (Check Engine Light) and so far so good. I haven't given it a lot of time but I know that there was a problem with the fact that the pinion would not move. If you don't know how that part should work you don't know something is wrong with it. Thanks again and if you have this P0401 code check out your EGV valve and clean it as is suggested here! It's great information.