carbon in intake = ox sensor failure ?
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carbon in intake = ox sensor failure ?
Hello, I'm a newbie to this forum. I searched for a similar topic and found none. My problem is with a 1998 f-150 Lariat, 180,000 miles.
At about 90,000 miles we had a 'check engine' warning. The shop said the OX sensor in the intake was indicated as not operating. He also said " We changed the sensor, but that was no help....and we kinda expected that". He said " The real problem is there is carbon and other gunk buildup in the intake and around the OX sensor area that prevents the sensor from getting good intake readings...this problem is common and does happen around 100,000 miles. The 'fix' is to remove the intake and clean it out (rags/brushes/solvent/whatever), then replace the sensor with a new one. It is labor intensive and usually runs about $ 800." "The engine is direct fuel injection, so the intake manifold is 'dry'---except for the fact the EGR still goes through there---and that is where the REAL problem is."
Well, here we are at 180,000 with a 'check engine' warning. The truck runs fine with light pedal pressure but gets 12 MPG.....and seems to be OK at W.O.T., anywhere in-between is rough sounding with uneven, weak power output.
Is all the green stuff from the previous 'repair' correct, and I'm just there again? Can I do anything to avoid this again. ( I have the truck now...it has been to college twice and come home to roost). There have been no other problems out of the ordinary.
ANY HELP IS APPRECIATED
At about 90,000 miles we had a 'check engine' warning. The shop said the OX sensor in the intake was indicated as not operating. He also said " We changed the sensor, but that was no help....and we kinda expected that". He said " The real problem is there is carbon and other gunk buildup in the intake and around the OX sensor area that prevents the sensor from getting good intake readings...this problem is common and does happen around 100,000 miles. The 'fix' is to remove the intake and clean it out (rags/brushes/solvent/whatever), then replace the sensor with a new one. It is labor intensive and usually runs about $ 800." "The engine is direct fuel injection, so the intake manifold is 'dry'---except for the fact the EGR still goes through there---and that is where the REAL problem is."
Well, here we are at 180,000 with a 'check engine' warning. The truck runs fine with light pedal pressure but gets 12 MPG.....and seems to be OK at W.O.T., anywhere in-between is rough sounding with uneven, weak power output.
Is all the green stuff from the previous 'repair' correct, and I'm just there again? Can I do anything to avoid this again. ( I have the truck now...it has been to college twice and come home to roost). There have been no other problems out of the ordinary.
ANY HELP IS APPRECIATED
Senior Member
Joined: Apr 2009
Posts: 3,683
Likes: 171
Wow I would first get a different shop, a lot of mis information. A Triton motor is indirectly injected. There is no O2 (which I assume he means by OX sensor) in the intake. These trucks use a hot wire MAF to measure air density.
Most consider the intake to be that up to the throttle body. The shop's version of intake must be the throttle body and heads.
Here's a good writeup that you can do yourself to clean the throttle body (there are two pages) and MAF.
http://www.fordf150.net/howto/throttlebodyclean.php
http://www.f150online.com/forums/art...ml#post4193148
The real question is what is the code you are getting now??
Most consider the intake to be that up to the throttle body. The shop's version of intake must be the throttle body and heads.
Here's a good writeup that you can do yourself to clean the throttle body (there are two pages) and MAF.
http://www.fordf150.net/howto/throttlebodyclean.php
http://www.f150online.com/forums/art...ml#post4193148
The real question is what is the code you are getting now??
