egr valve ???
Thread Starter
|
Senior User
Joined: Feb 2007
Posts: 182
Likes: 0
egr valve ???
I have been getting a check engine light which turns out to be a p0404 code.
This happens when the cruse is set and I'm pulling a hill traveling at 65. It down shifts the boost goes up to all most 30 psi then the check engine light comes on and the boost goes down. I have cleaned the egr valve. Is it a bad egr ? Any one else have this happen?
This happens when the cruse is set and I'm pulling a hill traveling at 65. It down shifts the boost goes up to all most 30 psi then the check engine light comes on and the boost goes down. I have cleaned the egr valve. Is it a bad egr ? Any one else have this happen?
Fleet Mechanic
Joined: Feb 2008
Posts: 1,955
Likes: 6
From: Eastern PA
The egr valve CAN cease to function.
When you say you cleaned it, what di dyou do? Did you take it out, blast the hell out of it with brake cleaner or carb cleaner, hit it with a tooth brush and flat head screw driver, and slide the slides up and down to ensure they were not gummed up, and able to move freely?
When you say you cleaned it, what di dyou do? Did you take it out, blast the hell out of it with brake cleaner or carb cleaner, hit it with a tooth brush and flat head screw driver, and slide the slides up and down to ensure they were not gummed up, and able to move freely?
Post Fiend
Joined: Jul 2005
Posts: 6,127
Likes: 6
EGRs can electrically fail --- as my first "cleaned" one did.
Put in a brand new one (with the pink dot to denote the upgraded part) from the dealer.
Don't trust eBay EGRs.
Did you completely clean the plenum of carbon?
Put in a brand new one (with the pink dot to denote the upgraded part) from the dealer.
Don't trust eBay EGRs.
Did you completely clean the plenum of carbon?
Thread Starter
|
Senior User
Joined: Feb 2007
Posts: 182
Likes: 0
The egr valve CAN cease to function.
When you say you cleaned it, what di dyou do? Did you take it out, blast the hell out of it with brake cleaner or carb cleaner, hit it with a tooth brush and flat head screw driver, and slide the slides up and down to ensure they were not gummed up, and able to move freely?
When you say you cleaned it, what di dyou do? Did you take it out, blast the hell out of it with brake cleaner or carb cleaner, hit it with a tooth brush and flat head screw driver, and slide the slides up and down to ensure they were not gummed up, and able to move freely?
Post Fiend
Joined: Jul 2005
Posts: 6,127
Likes: 6
The egr valve CAN cease to function.
When you say you cleaned it, what di dyou do? Did you take it out, blast the hell out of it with brake cleaner or carb cleaner, hit it with a tooth brush and flat head screw driver, and slide the slides up and down to ensure they were not gummed up, and able to move freely?
When you say you cleaned it, what di dyou do? Did you take it out, blast the hell out of it with brake cleaner or carb cleaner, hit it with a tooth brush and flat head screw driver, and slide the slides up and down to ensure they were not gummed up, and able to move freely?
Side note:
Brake cleaner is no longer recommended -- it will damage the shaft seal.
Thread Starter
|
Senior User
Joined: Feb 2007
Posts: 182
Likes: 0
do you have to take off the intake to do that? I put a brush down the hole and cleaned it the best I could.
Post Fiend
Joined: Jul 2005
Posts: 6,127
Likes: 6
A trick is that the loose carbon will not be entirely removed from the intake, and can continue to flake off for quite some time.
I believe what I had was carbon particles jamming intake / exhaust valves (and possibly turbo vanes) after a cleaning.
The symptom: 5mph top speed at full throttle!
Solution:
Pull to side of road, engage neutral, rev to 3,000 rpm a few times, and it cleared.
Once you clear the carbon build, you will find that it should not recur.
See my post here as to why older engines can have so much carbon in it:
https://www.ford-trucks.com/forums/1...ml#post9736104
If you have a grocery getter like application, be sure you "italian tuneup" the engine once a month at least.
WOT driving for a bit.. that is.
Thread
Thread Starter
Forum
Replies
Last Post
rwdfan
1987 - 1996 F150 & Larger F-Series Trucks
8
Jul 29, 2018 06:38 PM
X-Power
Explorer, Sport Trac, Mountaineer & Aviator
8
Sep 15, 2006 07:20 PM
