p0401,p1132,p1152,p0172
#1
05-02-2011, 03:46 PM
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p0401,p1132,p1152,p0172
Once i crank it up the idle is great id start to drive it and the idle would kind of glitch up and down on the rpm guage soo i took it to advance and I got the 0401 code like a month ago soo i replaced the pdfe sensor and the egr valve and it ran great.
and as of resently the problem came back only worse and now i have three more codes do you think it is my maf sensor? any sugestions?
and as of resently the problem came back only worse and now i have three more codes do you think it is my maf sensor? any sugestions?
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05-03-2011, 02:37 PM
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#4
05-03-2011, 04:51 PM
Ahhh. Okay. (Any indication of mileage on this eddie? Or other work that was done on it?)
The P0401 indicates that the PCM doesn't think it is detecting adequate flow through the EGR system. And you have already changed the EGR valve AND the DPFE.
What kind of shape are the hoses connected to the DPFE? Are they on the correct sides? Perhaps the hoses are plugged with carbon?
(The smaller diameter hose should be connected closer to the center of the DPFE than the larger hose, and at the other end the smaller diameter hose chould be connected to the EGR pipe closer to the valve than the larger hose is.)
How about the metal EGR pipe that runs up to the EGR valve? Is it blowing exhaust out of some small pin holes in the pipe?
Perhaps your EGR ports in the intake manifold are plugged up?
Is the vacuum hose connected between the EGR solenoid and the EGR valve in good shape? Properly connected with no vacuum leaks?
If you unplug the vacuum line to the EGR valve and apply a vacuum pump to the valve, with the engine at idle, can you make the engine stall?
(If it will stall as soon as you open the EGR valve, that would indicate that your EGR passages are not completly plugged.)
On the other hand, the fact that you have a ragged idle indicates that the EGR valve might be allowing some EGR into the intake. Additionally, the P0172 indicates the engine is running rich. (This could happen if it was allowing exhaust to flow through the EGR valve when it shouldn't. The exhaust displaces normal oxygen in the mixture and that makes the O2 sensors say, "hey, we need less fuel down here 'cause we can't find even a little oxygen in the exhaust!". That could also be causing the P1132/1152 which results when the O2 sensors are up against their lean stops.)
So I wouldn't condem the MAF, as it wouldn't cause the P0401. Lets see if we can verify any EGR flow first.
The P0401 indicates that the PCM doesn't think it is detecting adequate flow through the EGR system. And you have already changed the EGR valve AND the DPFE.
What kind of shape are the hoses connected to the DPFE? Are they on the correct sides? Perhaps the hoses are plugged with carbon?
(The smaller diameter hose should be connected closer to the center of the DPFE than the larger hose, and at the other end the smaller diameter hose chould be connected to the EGR pipe closer to the valve than the larger hose is.)
How about the metal EGR pipe that runs up to the EGR valve? Is it blowing exhaust out of some small pin holes in the pipe?
Perhaps your EGR ports in the intake manifold are plugged up?
Is the vacuum hose connected between the EGR solenoid and the EGR valve in good shape? Properly connected with no vacuum leaks?
If you unplug the vacuum line to the EGR valve and apply a vacuum pump to the valve, with the engine at idle, can you make the engine stall?
(If it will stall as soon as you open the EGR valve, that would indicate that your EGR passages are not completly plugged.)
On the other hand, the fact that you have a ragged idle indicates that the EGR valve might be allowing some EGR into the intake. Additionally, the P0172 indicates the engine is running rich. (This could happen if it was allowing exhaust to flow through the EGR valve when it shouldn't. The exhaust displaces normal oxygen in the mixture and that makes the O2 sensors say, "hey, we need less fuel down here 'cause we can't find even a little oxygen in the exhaust!". That could also be causing the P1132/1152 which results when the O2 sensors are up against their lean stops.)
So I wouldn't condem the MAF, as it wouldn't cause the P0401. Lets see if we can verify any EGR flow first.
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