P1335 Code
FTE Leadership Emeritus
Joined: Aug 2007
Posts: 42,085
Likes: 6
From: Lakewood, Ca.
P1335 = EGR position sensor minimum/maximum stop performance. Could be the valve is dirty. You might want to pull it out and have a look.
There's a good thread on removal/cleaning of the EGR valve in the 6.0 tech folder sticky.
There's a good thread on removal/cleaning of the EGR valve in the 6.0 tech folder sticky.
Last edited by SteveBricks; Dec 10, 2010 at 07:42 PM.
Senior User
Joined: Sep 2004
Posts: 432
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From: Upstate NewYork
Not to hijack the tread but cheezit, in another thread we talked about how removing the egr valve can have a direct effect on fan operation. Now we all know with these motor they raise combustion temps to help reduce emissions. Could the ECM actually be programmed to delay fan functions to create higher heat in engine to help reduce emissions when the egr system has been compromised. Seems like a gamble to run engine hotter but hey you never know. I know you have ran a few test and seen lower fan rpm's when egr system is non-operational. Is there a limit when the fan will kick in to keep the motor from melt down?
Fleet Owner
Joined: Nov 2003
Posts: 27,872
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The recirculation of exhaust gas is to lower the flame (or combustion) temp. That reduces NOx emissions.
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Post Fiend
Joined: Oct 2009
Posts: 12,123
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From: N. Fort Worth, tx
emmm. egr is there to reduce Nox. Nox is formed at 1500*f. we want to add exhaust gas to reduce cyclinder temp.
I belive the the circuit that is effected is circuit 351 and for some reason it ties in to actavating the fan. I satill havnt figured out why they are doing this but they are. I do need to send a contact threw and ask if anyone has a clue
I belive the the circuit that is effected is circuit 351 and for some reason it ties in to actavating the fan. I satill havnt figured out why they are doing this but they are. I do need to send a contact threw and ask if anyone has a clue
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Senior User
Joined: Sep 2004
Posts: 432
Likes: 0
From: Upstate NewYork
emmm. egr is there to reduce Nox. Nox is formed at 1500*f. we want to add exhaust gas to reduce cyclinder temp.
I belive the the circuit that is effected is circuit 351 and for some reason it ties in to actavating the fan. I satill havnt figured out why they are doing this but they are. I do need to send a contact threw and ask if anyone has a clue
The recirculation of exhaust gas is to lower the flame (or combustion) temp. That reduces NOx emissions.
I belive the the circuit that is effected is circuit 351 and for some reason it ties in to actavating the fan. I satill havnt figured out why they are doing this but they are. I do need to send a contact threw and ask if anyone has a clue
The recirculation of exhaust gas is to lower the flame (or combustion) temp. That reduces NOx emissions.
[COLOR=black][FONT=Verdana] My mistake, thanks, still would like to find the correlation between the egr and fan circuit
Post Fiend
Joined: Oct 2009
Posts: 12,123
Likes: 35
From: N. Fort Worth, tx
like I said its hooked threw cicuit 361. I belive the last 2 legs of that circuit is the egr valve then the fan clutch.
but that still has me wondering why the maf and the gpcm dont have that issue if that was the real cause.
but that still has me wondering why the maf and the gpcm dont have that issue if that was the real cause.
Elder User
Joined: Mar 2005
Posts: 526
Likes: 4
From: New Jersey
If your EGR valve was replaced 5 months ago and it has a minimum stop performance issue it is either loading up heavily or has a carbon chunk stuck in it. It is very common to find a bad EGR cooler causing low mileage repeat EGR valve concerns like sticking or hanging open.
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Post Fiend
Joined: Sep 2005
Posts: 5,955
Likes: 9
From: Ohio
If your EGR valve was replaced 5 months ago and it has a minimum stop performance issue it is either loading up heavily or has a carbon chunk stuck in it. It is very common to find a bad EGR cooler causing low mileage repeat EGR valve concerns like sticking or hanging open.
Ok, thanks! that was the answer i was wanting/not wanting lol But i have a warrenty so its all good. What would happen if i kept driving the truck? Since i dont have guages, i cant really tell ya the EOT and ECT temps.
And cheezit, my rig wasnt pullin those codes.
Elder User
Joined: Mar 2005
Posts: 526
Likes: 4
From: New Jersey
At this point monitoring the temps isn't going to help other than diagnose a cooler problem. Yeah, you can drive the truck but you will likely experience driveability issues and if the valve hangs open enough the engine will smoke, stall and even not start. The longer you drive it without addressing this problem the more likely you are to have a problem... usually at an inconvenient time!
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