EEC-IV codes - guess which component?
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Mountain Pass
Joined: Apr 2001
Posts: 198
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EEC-IV codes - guess which component?
I'm getting -
33 - EGR valve opening not detected
from current conditions and -
334 - EGR closed voltage higher than expected
from memory.
Any guesses on whether it's the EGR valve or the EGR position sensor?
Tom
PS: autozone.com says the EGR valve for my vehicle (90 Bronco / 351) is not testable with a vacuum pump?
Moderator
Joined: Jan 2001
Posts: 56,948
Likes: 2,717
From: Virginia
EEC-IV codes - guess which component?
Take the valve off and see if it is physically stuck and carboned up. If not, then I would bet position sensor. Take an ohm meter and see if you can check it.
Junior User
Joined: Sep 2001
Posts: 84
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From: Round Rock USA
EEC-IV codes - guess which component?
Try www.dali-design.com. This guy has a tech manual that is really good.
If you have a lot of miles on that EGR, you might want to replace both the EGR and the sensor. It's not cheap but will solve the problem. Unless of course you like a challenging science project.
If you have a lot of miles on that EGR, you might want to replace both the EGR and the sensor. It's not cheap but will solve the problem. Unless of course you like a challenging science project.
Elder User
Joined: Oct 2001
Posts: 974
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EEC-IV codes - guess which component?
There are actually three components involved, the EGR valve, the EVP (EGR Valve Position sensor), and the EGR actuation solenoid. I had the same codes before, and it ended up being the EGR actuation solenoid. This is what opens the vacuum line to the EGR valve for it to work.
You can test the EGR valve. Unplug the vacuum line at the valve and plug it with a golf tee or a vacuum plug. Connect a vacuum pump or source to the EGR valve. Start the engine, and then apply vacuum to the valve. The valve should open and the engine will die.
You can also test the position sensor by connecting a vacuum pump to the valve with the engine off. Connect an Ohmeter to the sensor and check the resistance of the sensor as you apply vacuum to the valve. It will change. I am not sure what the specs are for the sensor, but it's a start.
Good Luck!
You can test the EGR valve. Unplug the vacuum line at the valve and plug it with a golf tee or a vacuum plug. Connect a vacuum pump or source to the EGR valve. Start the engine, and then apply vacuum to the valve. The valve should open and the engine will die.
You can also test the position sensor by connecting a vacuum pump to the valve with the engine off. Connect an Ohmeter to the sensor and check the resistance of the sensor as you apply vacuum to the valve. It will change. I am not sure what the specs are for the sensor, but it's a start.
Good Luck!
