Dang!
#1
Dang!
I posted this in FTE forums and no responses.... So hopefully someone here would help I have the 3.0 flex just to clarify. But the other day I did the maf mod to it and now have a C.E.L. indicator on. The codes I pulled are PO171,PO174. So that means that banks 1,2 are running lean..... I unhooked the negative cable for an hour then let truck idle for 20 mins, it runs fine but after I drive for ten minutes or so that blasted light comes back on , and Ive done this several times. What gives the only time I pulled a PO102 code was when I unhooked the M.A.F ... And heck I think it ran better than with it on "no pings". Whats making my truck run lean? If its the M.A.F is there any thing else I can do to it to fix this crap...
Oh and by the way its the maf that is complete cast alum.
Thanks,
Pj
Oh and by the way its the maf that is complete cast alum.
Thanks,
Pj
#2
#3
#4
Okay so obviously your truck has a computer in it. When you first turn on your truck, it's using data thats preset in it to run your truck. Such as air/fuel mixtures and whatnot. Just stuff that the sensors sitting in your truck could be measuring but arent. Once you reach a speed of about 60 miles per hour for a sustained period on a road your truck computer then has all teh sensors start giving it information. It becomes open loop, meaning its receiving data. So that 10 minute wait before your CEL turns on means most likely the sensor kicks in once you have driven long enough and notices a problem.
Oh, and when i say closed loop the sensors are off, i dont mean every single sensors. Just a good amount of them.
If you lived in a small town like I do, its actually pretty bad because rarely does my truck reach open loop. There's no faster than 55 in my town and the roads aren't that long, so most of my drives are a few miles at 35 mph.
Aaron
Oh, and when i say closed loop the sensors are off, i dont mean every single sensors. Just a good amount of them.
If you lived in a small town like I do, its actually pretty bad because rarely does my truck reach open loop. There's no faster than 55 in my town and the roads aren't that long, so most of my drives are a few miles at 35 mph.
Aaron
#7
Originally Posted by Red_Ak_Ranger
Okay so obviously your truck has a computer in it. When you first turn on your truck, it's using data thats preset in it to run your truck. Such as air/fuel mixtures and whatnot. Just stuff that the sensors sitting in your truck could be measuring but arent. Once you reach a speed of about 60 miles per hour for a sustained period on a road your truck computer then has all teh sensors start giving it information. It becomes open loop, meaning its receiving data. So that 10 minute wait before your CEL turns on means most likely the sensor kicks in once you have driven long enough and notices a problem.
Oh, and when i say closed loop the sensors are off, i dont mean every single sensors. Just a good amount of them.
If you lived in a small town like I do, its actually pretty bad because rarely does my truck reach open loop. There's no faster than 55 in my town and the roads aren't that long, so most of my drives are a few miles at 35 mph.
Aaron
Oh, and when i say closed loop the sensors are off, i dont mean every single sensors. Just a good amount of them.
If you lived in a small town like I do, its actually pretty bad because rarely does my truck reach open loop. There's no faster than 55 in my town and the roads aren't that long, so most of my drives are a few miles at 35 mph.
Aaron
#8
Originally Posted by Sicko
Thanks that clears things up......
PJ
PJ
No it really doesnt... Make sure you have everything reinstalled the way you took it off. Make sure all of you intake connections are tight(intake tube) and you MAF connector is clean and making good connection. After that, you may want to take the MAF back off and be sure you didnt damage something or there isnt any debris in the sampling tube.
#9
Originally Posted by Sicko
I posted this in FTE forums and no responses.... So hopefully someone here would help I have the 3.0 flex just to clarify. But the other day I did the maf mod to it and now have a C.E.L. indicator on. The codes I pulled are PO171,PO174. So that means that banks 1,2 are running lean.....
In your case, you have changed it enough to exceed the limits of the OBDII diagnostics - that is why the CEL is on. IMO, the only way you will get rid of the CEL is to undo the MAF mod. That would require a replacement MAF.
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