Code 84 and 34... related?
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Cross-Country
Joined: Apr 2010
Posts: 75
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From: NE Okla.
Code 84 and 34... related?
This is on a 1986 F150 w/ 5.0 EFI (of course!).
I've done some searching on this but was hoping maybe someone out there has had the same problem and could enlighten me. Both codes seem related to each other.
These codes came up with the engine run test.
The EGR valve is clean so I'm ruling that out.
I'm guessing the position sensor or the solenoids.
Ohms measured 3800 to 800 on the EGR position sensor from 0 to 10 in.Hg vacuum (I believe specs call for 5500 ohms to 100 ohms).
When I pull the vacuum line from the EGR position sensor and rev the engine, I feel vacuum but it "pulses". It's not steady.
Sound correct?
Thanks!
I've done some searching on this but was hoping maybe someone out there has had the same problem and could enlighten me. Both codes seem related to each other.
These codes came up with the engine run test.
The EGR valve is clean so I'm ruling that out.
I'm guessing the position sensor or the solenoids.
Ohms measured 3800 to 800 on the EGR position sensor from 0 to 10 in.Hg vacuum (I believe specs call for 5500 ohms to 100 ohms).
When I pull the vacuum line from the EGR position sensor and rev the engine, I feel vacuum but it "pulses". It's not steady.
Sound correct?
Thanks!
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Joined: Jan 2001
Posts: 56,977
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From: Virginia
This is out of my fuel injection book;
Code 34 means the EVP (EGR Valve Position sensor) voltage was above the max limit.
During the key on engine running test, if code 34 is received, the EVP sensor is sending a signal greater than .67 volts. This can be caused by a clogged EVR filter, faulty EVR solenoid, faulty EGR valve, or a faulty EVP sensor.
He says to take the vacuum line off the egr valve, and then try the test again, and see if the code returns. It it doesn't return, then it means the egr and it's sensor are ok. He also says it may be the filter on the control valve. It has a little round cap on it. Take the cap off, and there is a foam filter that likes to get clogged.
Code 34 means the EVP (EGR Valve Position sensor) voltage was above the max limit.
During the key on engine running test, if code 34 is received, the EVP sensor is sending a signal greater than .67 volts. This can be caused by a clogged EVR filter, faulty EVR solenoid, faulty EGR valve, or a faulty EVP sensor.
He says to take the vacuum line off the egr valve, and then try the test again, and see if the code returns. It it doesn't return, then it means the egr and it's sensor are ok. He also says it may be the filter on the control valve. It has a little round cap on it. Take the cap off, and there is a foam filter that likes to get clogged.
Thread Starter
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Cross-Country
Joined: Apr 2010
Posts: 75
Likes: 0
From: NE Okla.
I broke out the fuel injection book today and started reading.
I've got to say that is a great book!
I took my time and really read everything as well as constantly comparing what was under the hood to what was in the book.
It really made sense!
After following the step by step testing of each EGR component, I found a dead EGRV solenoid. So a set is on order.
Maybe this will cure the annoying one time stall that happens when I first start the truck cold (well, as cold as it can get in Oklahoma in the summer).
Much thanks for the help.
I've got to say that is a great book!
I took my time and really read everything as well as constantly comparing what was under the hood to what was in the book.
It really made sense!
After following the step by step testing of each EGR component, I found a dead EGRV solenoid. So a set is on order.
Maybe this will cure the annoying one time stall that happens when I first start the truck cold (well, as cold as it can get in Oklahoma in the summer).
Much thanks for the help.
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