Koeo codes
Thread Starter
|
Junior User
Joined: Dec 2008
Posts: 75
Likes: 0
From: Upland, CA
Koeo codes
11,11,34,41,34,41
Ford Fuel Injection Two Digit Codes 33-58
so whats that mean i have to fix??
im going to run a koer test right now too
Ford Fuel Injection Two Digit Codes 33-58
so whats that mean i have to fix??
im going to run a koer test right now too
Thread Starter
|
Junior User
Joined: Dec 2008
Posts: 75
Likes: 0
From: Upland, CA
i know that but how do i go about fixing it
Elder User
Joined: Feb 2008
Posts: 721
Likes: 0
From: Four Corners, MT
41 is your oxygen sensor man.
If you have two then it's the right (drivers) side.
34 is telling the PCM that the EGR valve is open.
This should help you out.
If you have two then it's the right (drivers) side.
34 is telling the PCM that the EGR valve is open.
This should help you out.
Originally Posted by Tom Adkins@FordForums
1. EGR valve has a layer of carbon keeping the pintle up slightly, fooling the
EVP.(Or a chunk holding it open, along with poor idle).
2. EVR filter clogged allowing vacuum to the EGR valve at idle
3. EVP sensor shorted internally sending a false signal to the PCM
There could also be a high resistance short in the wiring to the EVP sensor or other
wiring concerns but these are uncommon. At 150K it could be any or all of the above.
First, check the filter in the EVR. It's under the round cap on the solenoid. Clean
it with hot soapy water. You can just remove it for testing but be sure to clean and
reinstall it. If this is not the cause of your code 32 then look at the EGR\EVP asy.
You mentioned that you had to clean the valve due to carbon fouling. In my
experience, although you can free up the valve so that it will move smoothly, it is
difficult to de-carbon the pintle area so that it can fully seat. Even though the
valve may seal, the pintle is up a few thousandths of an inch causing a false reading
at the EVP sensor.
Speaking of the EVP, these were a high failure item on EEC-IV vehicles. You can test
it with an ohm meter if you care to, but after 19 years and 150K miles.........well,
you get the idea.
If this were my vehicle, I would just replace the EGR and EVP and call it done. For
yours I would suggest at least a new EVP. If the code is still present, grind about
1/32" off of the EVP shaft so that it is sending the proper "EGR closed" signal to the
PCM. I've had to do this a few times even with new parts due to manufacturing tolerances.
If you happen to have the factory Emissions Manual (Volume H) for your truck, it
will tell you what the feedback voltage from the EVP should be when the valve is fully
closed and how to test the EVP resistance. You won't likely find it in Chilton or
Haynes. The info is also available on Alldata for a fee.
EVP.(Or a chunk holding it open, along with poor idle).
2. EVR filter clogged allowing vacuum to the EGR valve at idle
3. EVP sensor shorted internally sending a false signal to the PCM
There could also be a high resistance short in the wiring to the EVP sensor or other
wiring concerns but these are uncommon. At 150K it could be any or all of the above.
First, check the filter in the EVR. It's under the round cap on the solenoid. Clean
it with hot soapy water. You can just remove it for testing but be sure to clean and
reinstall it. If this is not the cause of your code 32 then look at the EGR\EVP asy.
You mentioned that you had to clean the valve due to carbon fouling. In my
experience, although you can free up the valve so that it will move smoothly, it is
difficult to de-carbon the pintle area so that it can fully seat. Even though the
valve may seal, the pintle is up a few thousandths of an inch causing a false reading
at the EVP sensor.
Speaking of the EVP, these were a high failure item on EEC-IV vehicles. You can test
it with an ohm meter if you care to, but after 19 years and 150K miles.........well,
you get the idea.
If this were my vehicle, I would just replace the EGR and EVP and call it done. For
yours I would suggest at least a new EVP. If the code is still present, grind about
1/32" off of the EVP shaft so that it is sending the proper "EGR closed" signal to the
PCM. I've had to do this a few times even with new parts due to manufacturing tolerances.
If you happen to have the factory Emissions Manual (Volume H) for your truck, it
will tell you what the feedback voltage from the EVP should be when the valve is fully
closed and how to test the EVP resistance. You won't likely find it in Chilton or
Haynes. The info is also available on Alldata for a fee.
Mountain Pass
Joined: May 2005
Posts: 209
Likes: 0
From: Arizona
A few weeks ago my 95 F150 5.0L was running pretty bad.I had to give it a lot of gas just to maintain 40mph.When I got home I hooked up my Autoxray reader and got a 177 code, O2 sensor not switching ,system was rich.Also I got a 328 code VGR valve position is/was low.I changed the O2 sensor and both problems went away.The only reason I can think of for the 328 code is that just trying to maintain the 40mph (the engine was lugging) to get the truck home cause the EGR valve to only open part way sending a bad signal to the computer.
Thread
Thread Starter
Forum
Replies
Last Post
c2z4s9
1980 - 1986 Bullnose F100, F150 & Larger F-Series Trucks
2
Apr 2, 2016 12:21 PM
calarbor
1978 - 1996 Big Bronco
7
Jun 12, 2013 11:40 AM
