Code 334
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More Turbo
Joined: May 2014
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Code 334
94 F250, 7.5, Auto
Using the jumper wire method, I consistently get a code 334. "EGR valve position sensor voltage above closed limit."
What does this mean, and how do I fix it. Have already replaced the egr, and evp on top of egr.
Any help please? Kinda running out of patience!
Using the jumper wire method, I consistently get a code 334. "EGR valve position sensor voltage above closed limit."
What does this mean, and how do I fix it. Have already replaced the egr, and evp on top of egr.
Any help please? Kinda running out of patience!
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More Turbo
Joined: May 2014
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yeah torq'ta 5 8, I felt pretty stupid when I realized my mistake. Have been chasing this problem for 3 days now. Lol
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More Turbo
Joined: May 2014
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Ok, I'm back. Fixed the code 334. Reset by disconnecting negative on battery. Now getting code 111, which is the pass code. However, motor still stumbling and idling slightly rough. How long for the computer to learn new parameters? Or do I have something else going on?
Fleet Mechanic
Joined: Aug 2015
Posts: 1,827
Likes: 358
From: Candy Mountain
just to be clear... there should be 3 vacuum solenoids TAB, TAD, and EVR which is the one controlling the EGR.
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Joined: May 2014
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EGR solenoid, EGR, and EVP all new. Still code 111, after a test drive. Still a rough idle. I did do a comp cam and complete Banks header and exhaust. Trying to work out the bugs.
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More Turbo
Joined: May 2014
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Likes: 73
no, I have not. Just assumed based on research, all would work well together. It really feels like a misfire under load. Gonna check fuel pressure, replace the plugs, keep digging into it. Motor ran great prior to rebuild, other than massive exhaust leak.
Lead Driver
Joined: Jan 2019
Posts: 5,064
Likes: 860
From: N.W. Alabama
before you replace plugs, see link, it has a way to test for misfire, see if you can get a vacuum reading, our trucks are picky on cam selection, no matter what engine.
Part 1 -How to Do a Cylinder Balance Test (Ford 5.0L, 5.8L)
Part 1 -How to Do a Cylinder Balance Test (Ford 5.0L, 5.8L)
Thread Starter
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More Turbo
Joined: May 2014
Posts: 587
Likes: 73
before you replace plugs, see link, it has a way to test for misfire, see if you can get a vacuum reading, our trucks are picky on cam selection, no matter what engine.
Part 1 -How to Do a Cylinder Balance Test (Ford 5.0L, 5.8L)
Part 1 -How to Do a Cylinder Balance Test (Ford 5.0L, 5.8L)
Lead Driver
Joined: Jan 2019
Posts: 5,064
Likes: 860
From: N.W. Alabama
I had just put in new (purdy) blue plug wires, and had what I considered, a hard idle, under load seemed to clear up, finally found it 'them' ohmed the wires a 3rd time, shaking them,, the spiral core wire had broke, and showing the fiberglass, where it was stripped back to and crimped, #4, and the coil wire were like that.
Thread Starter
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More Turbo
Joined: May 2014
Posts: 587
Likes: 73
I had just put in new (purdy) blue plug wires, and had what I considered, a hard idle, under load seemed to clear up, finally found it 'them' ohmed the wires a 3rd time, shaking them,, the spiral core wire had broke, and showing the fiberglass, where it was stripped back to and crimped, #4, and the coil wire were like that.