Very high idle and egr code
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From: Liberty mo
Very high idle and egr code
I have a 3.0 v6 and about as soon as I start it up it will rev up to about 3000 to 3500 rpm. Sometimes it will lower down to 1500 but as soon as I start moving and push the clutch in it will shoot back up but as soon as I stop it falls back down. On some occasions it will drive perfectly fine. The only code it’s throwing right now is an egr code I replaced the egr valve a while back but the code didn’t go away the high idle didn’t start until 4-5 months after the egr code.
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Joined: Jul 2016
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From: BC Canada
What is the actual code, low flow, high flow ???
Yours is a 2000, so probably similar to my 99.
Many thing can cause a high idle, such as a vacuum leak, but the EGR system needs to be dealt with first.
The EGR system is pretty simple, the most common thing that goes wrong is the DPFE sensor, if you still have the metal one, replace it with the plastic one _ get the Ford part if you can afford it.
Replace the two pressure lines coming from it as well that lead to the EGR chimney, they look like vacuum lines, but they're not, they're made out of silicon to take the hot exhaust.
The next bit is the vacuum motor that is controlled by the DPFE sensor, the solenoid that opens and closes the EGR valve by applying vacuum to it can stop working by either sticking open or closed.
The most common test for a vacuum leak is to unplug the IAC valve after the truck is fully warmed up.
If there are no vacuum leaks, the engines idle will drop to 500 rpm or may even stall, that's a good thing.
This is a general test, but not a definite one.
On my truck the test shows no vacuum leaks, but my idle is a little high at 800 to 900 rpm _ and it wonders slightly, even when warm and sometimes it will be OK.
I'm pretty sure I have a slight vacuum leak that unplugging the IAC valve won't show.
The test should work better with yours because it idles very high.
Get your self a cheap vacuum pump and check all the vacuum lines coming of the port of the back of the upper intake manifold (assuming you still have the aluminum manifold).
Yours is a 2000, so probably similar to my 99.
Many thing can cause a high idle, such as a vacuum leak, but the EGR system needs to be dealt with first.
The EGR system is pretty simple, the most common thing that goes wrong is the DPFE sensor, if you still have the metal one, replace it with the plastic one _ get the Ford part if you can afford it.
Replace the two pressure lines coming from it as well that lead to the EGR chimney, they look like vacuum lines, but they're not, they're made out of silicon to take the hot exhaust.
The next bit is the vacuum motor that is controlled by the DPFE sensor, the solenoid that opens and closes the EGR valve by applying vacuum to it can stop working by either sticking open or closed.
The most common test for a vacuum leak is to unplug the IAC valve after the truck is fully warmed up.
If there are no vacuum leaks, the engines idle will drop to 500 rpm or may even stall, that's a good thing.
This is a general test, but not a definite one.
On my truck the test shows no vacuum leaks, but my idle is a little high at 800 to 900 rpm _ and it wonders slightly, even when warm and sometimes it will be OK.
I'm pretty sure I have a slight vacuum leak that unplugging the IAC valve won't show.
The test should work better with yours because it idles very high.
Get your self a cheap vacuum pump and check all the vacuum lines coming of the port of the back of the upper intake manifold (assuming you still have the aluminum manifold).
Last edited by Jeff R 1; Sep 3, 2018 at 11:00 AM.
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