EGR questions
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Junior User
Joined: Jun 2014
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From: Kansas City, MO
Got it, thanks. In my first post i said i did what the tech in the video i posted did, manually engaged the EGR via the EVR. I wonder now if i was testing with the wrong vacuum regulator. I see 2 in my engine bay, one on the driver side fender well (the one i tested) and one behind the ignition coil pack. Upon closer inspection, it appears this one is where the vacuum hose from the EGR valve runs to. I'm wondering if doing the test in the video on this regulator will engage the EGR valve like i'm wanting and rule that part out...
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Junior User
Joined: Jun 2014
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From: Kansas City, MO
Ok, i tested this from the proper EVR and it gave me a rough idle. I did this while metering the DPFE sensor output and noticed no change. At this point i think i have to assume the valve operation is ok.
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Joined: Jan 2004
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From: SW Va
So, perform the EVR blow back test oops did & let us know how it goes. Hang in there & persevere & you'll likely find the problem.
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Joined: Jan 2004
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From: SW Va
Are you certain the DPFE sensor is receiving its 5 volt reference???? Are the DPFE electrical pins & sockets in good condition & its electrical connector properly secured. All those things have to be Right for the DPFE to function as designed.
More thoughts for consideration, keep us posted on your trouble shoot.
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Thread Starter
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Junior User
Joined: Jun 2014
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From: Kansas City, MO
I checked the DPFE hoses, they're good. The 5V reference circuit is good. I only see bad things happening if i try to remove the EGR tube, it looks pretty old. I was going to try to remove the EGR valve last weekend but i couldn't even break the nut loose on the bottom of it, i don't even know how i'd reach the bottom bolt of the tube...
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From: SW Va
No need to remove the EGR valve to see if the feedback orifice below it is clogged shut, just disconnect the exhaust feedback hose at the DPFE, start the engine & see if you have exhaust blowing out of the hose.
For the vacuum hose, attach it to your vacuum gauge, or put your finger over the hole & see if you can feel suction.
For the vacuum hose, attach it to your vacuum gauge, or put your finger over the hole & see if you can feel suction.
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Junior User
Joined: Jun 2014
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From: Kansas City, MO
Definitely have good exhaust flow to the DPFE. I removed the vacuum hose from the EGR valve and i think there's vacuum, i mean i can feel something, it isn't very strong though. I don't have a vacuum gauge, maybe i should invest in one...
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From: SW Va
OK that's good that you have good exhaust flow into the DPFE sensor, as it suggests that the orifice below the EGR valve & the exhaust feedback hose to the DPFE sensor are open & flowing exhaust to the DPFE sensor as it should. Now how good was the engine vacuum on the other DPFE (vacuum) hose, when you disconnected it from the DPFE sensor, with the engine running???? Did you have good suction there????
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Joined: Jan 2004
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From: SW Va
Yup, disconnect the DPFE vacuum hose & check for vacuum with the engine running, as that'll tell us if the hose & its connection on the other end are ok. If it is, then it looks like the new DPFE sensor belongs at the top of your suspect list, unless someone else can think of something we've missed, or another EGR system test to perform.