P0401 question
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Laughing Gas
Joined: Dec 2010
Posts: 1,155
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From: Las vegas nevada
I will definitely look into sensor cleaning as packagerjr suggested it is definitely easier to look at those before pulling intake for a suspect cooler...
thank you very much for the tips and another way to go about diagnosing.
thank you very much for the tips and another way to go about diagnosing.
Posting Guru
Joined: Mar 2014
Posts: 1,468
Likes: 5
From: Salt Lake City, utah
I suspect the earlier 2005 trucks do not throw the CEL.
I've seen them not throw them and throw them, and based on the build date on the door sticker one was an early 05, the other was late fall 05.
I could be full of it, but I think it the location of the EBP sensor might coincide with this. The early 05 still had the sensor by the thermostat.
Again, I might be way off base here.
I've seen them not throw them and throw them, and based on the build date on the door sticker one was an early 05, the other was late fall 05.
I could be full of it, but I think it the location of the EBP sensor might coincide with this. The early 05 still had the sensor by the thermostat.
Again, I might be way off base here.
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Laughing Gas
Joined: Dec 2010
Posts: 1,155
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From: Las vegas nevada
What are known good values to be looking at prior to cleaning EBP,IAT2,Egr valve,map sensor and after so I know if it makes a difference. I have scan guage II, auto engunity, maxi check 808 ,( forscan, torquepro bfax bluetooth adapter for android) DVOM if needed.
thanks again
thanks again
Posting Guru
Joined: Mar 2014
Posts: 1,468
Likes: 5
From: Salt Lake City, utah
What are known good values to be looking at prior to cleaning EBP,IAT2,Egr valve,map sensor and after so I know if it makes a difference. I have scan guage II, auto engunity, maxi check 808 ,( forscan, torquepro bfax bluetooth adapter for android) DVOM if needed.
thanks again
thanks again
With KOEO EBP should match MAP and BARO with in 1.5psi. The IAT2 after cold soak should match ambient or pretty close along with intake air sensor in the turbo air filter tube. If the IAT2 is working you should see temps while running 50-80* hotter than the intake air temp and should fluctuate higher than when the EGR is open should drop a little when closed.
Freshman User
Joined: Jul 2014
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I’m having the same issue on my 05, and I’m also in Clark County, so have to deal with the smog crap. I had a Bulletproof cooler installed a few years back, and with this latest round I’ve replaced the EGR valve, the IAT sensor, along with the MAF sensor and the CAC tube (it was leaking, and blowing oil under the hood, plus I had read somewhere that it could cause the code). My CEL comes back on pretty quickly after clearing the code, and I know it’s something simple, as the truck runs smooth and my mileage is still good. I’m using a DashBoss for extra monitoring, and the truck has about 252K miles.
Fleet Owner
Joined: Nov 2003
Posts: 27,885
Likes: 3,599
I’m having the same issue on my 05, and I’m also in Clark County, so have to deal with the smog crap. I had a Bulletproof cooler installed a few years back, and with this latest round I’ve replaced the EGR valve, the IAT sensor, along with the MAF sensor and the CAC tube (it was leaking, and blowing oil under the hood, plus I had read somewhere that it could cause the code). My CEL comes back on pretty quickly after clearing the code, and I know it’s something simple, as the truck runs smooth and my mileage is still good. I’m using a DashBoss for extra monitoring, and the truck has about 252K miles.
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Joined: Jul 2014
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Fleet Owner
Joined: Nov 2003
Posts: 27,885
Likes: 3,599
Poor quality video, but I believe you will get what you need from it.
I clean my EBP tube out w/ a thick weedwhacker string (I don't remove the tube).
I clean my EBP tube out w/ a thick weedwhacker string (I don't remove the tube).
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Poor quality video, but I believe you will get what you need from it.
https://www.youtube.com/watch?v=yt3bnEYgx2c
I clean my EBP tube out w/ a thick weedwhacker string (I don't remove the tube).
https://www.youtube.com/watch?v=yt3bnEYgx2c
I clean my EBP tube out w/ a thick weedwhacker string (I don't remove the tube).
Thread Starter
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Laughing Gas
Joined: Dec 2010
Posts: 1,155
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From: Las vegas nevada
Ok so all my sensors check out with each other and are within spec of each other. So I'm going to put this to rest. Have no further issues or questions.
thank you for all the help
I do have another issue with fuel pressure I will start another thread.
thank you for all the help
I do have another issue with fuel pressure I will start another thread.
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