Egr valve question
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Egr valve question
I have a 2001 ranger edge plus with the 4.0l V6. I failed at emissions yesterday, the sheet said P0401 exhaust gas recirculation flow insufficient. I pulled the egr valve out and it seem s to be working ok. I cleaned it out real well, i pulled out the throttle body and cleaned that also. I cleaned the tube that goes from the EGR into the upper manifold, it was loaded with crud. I even sprayed the inside of the upper manifold. I let it sit about 10 minutes and took it out to "clean 'er out" and i still get knocking when i accelerate. What else can i clean/check to fix the knock and pass emissions?
Things are so much easier on my '69 Chevelle, 1 PCV valve is the only emissions component!!!!
Things are so much easier on my '69 Chevelle, 1 PCV valve is the only emissions component!!!!
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From: SW Va
Look to the DPFE sensor, it controls the EGR valve & is a common problem in cases like yours.
Also make sure the small manafold orfice at the base of the EGR's location is cleaned out, as carbon often plugges it up so it's often missed during the EGR's cleaning service.
Also a dirty MAF sensor will cause engine ping, so keep that in the back of your mind, if fixing the EGR problem doesn't solve the knock.
If you do happen to find the MAF dirty, you need to look further & find out WHY!!!
Look for a damaged, ill fitting, or mis~positioned air filter, improperly buttoned up air box, or damaged air box/air tube interface, any thing that would let unfiltered air get to the MAF!!!!
Just some thoughts for pondering!!!!
Also make sure the small manafold orfice at the base of the EGR's location is cleaned out, as carbon often plugges it up so it's often missed during the EGR's cleaning service.
Also a dirty MAF sensor will cause engine ping, so keep that in the back of your mind, if fixing the EGR problem doesn't solve the knock.
If you do happen to find the MAF dirty, you need to look further & find out WHY!!!
Look for a damaged, ill fitting, or mis~positioned air filter, improperly buttoned up air box, or damaged air box/air tube interface, any thing that would let unfiltered air get to the MAF!!!!
Just some thoughts for pondering!!!!
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ok, i'll try looking into the DPFE. I don't think it's the MAF, i have a K & H filter in there and it came with a stick on gasket to really seal it up good, but i won't rule out anything at this point. Thanks.
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Joined: Jan 2004
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From: SW Va
Well the K&N oiled gause air filter has two things going for it, that aren't optimal for the MAF IMHO.
One is it's oiled, so if it's over done or what's used evaporated off easly, the MAP is down stream & can get coated & tat leads to the second potental problem & that is the K&N passes more particles to land on & stck to the MAF's heated element.
You might be interested in a nice air filter element test graph I ran accross not too long ago. It plots filtering ability, pressure drop accross the filter, of several popular filters, both paper & oiled gause, the K&N was in there too. Check it's interesting & nicely plotted out graph results. Their done to ISO 5011!!!! http://home.usadatanet.net/~jbplock/ISO5011/SPICER.htm
Another one done to less scientific standards, but with nontheless interesting visual results, is posted at http://www.bobistheoilguy.com/airfilter/airtest1.htm
So IMHO don't be too quick to dismiss a dirty MAF as a possibility LOL!!!!!
One is it's oiled, so if it's over done or what's used evaporated off easly, the MAP is down stream & can get coated & tat leads to the second potental problem & that is the K&N passes more particles to land on & stck to the MAF's heated element.
You might be interested in a nice air filter element test graph I ran accross not too long ago. It plots filtering ability, pressure drop accross the filter, of several popular filters, both paper & oiled gause, the K&N was in there too. Check it's interesting & nicely plotted out graph results. Their done to ISO 5011!!!! http://home.usadatanet.net/~jbplock/ISO5011/SPICER.htm
Another one done to less scientific standards, but with nontheless interesting visual results, is posted at http://www.bobistheoilguy.com/airfilter/airtest1.htm
So IMHO don't be too quick to dismiss a dirty MAF as a possibility LOL!!!!!
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From: Blytheville, AR
Idk know what it's called, but there is an EGR vacuum regulator or something along those lines that may clear up the rough idle. Idk about helping to pass emissions.
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There are TWO vacumm devices, one, a control that routes vacuum to the egr valve (cycles on/off as per demand) and the Differential pressure sensor, that reads the EGR flow (has a pair of vacuum lines that run to the flow tube)