WTF- Check engine light? - FordTough.ca - Home of Canadian Ford Truck Enthusiasts
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post #1 of 13 (permalink) Old 05-16-2008, 07:36 AM Thread Starter
 
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WTF- Check engine light?

Well..

So I installed an AFE intake system back when Blackstock had the sale..

Couple weeks after.. 06SILVERF150 and I got together to try a bumper swap.. no go BTW..

Just as we were parting ways, my check engine light came on for some reason..
I realized I forgot to install some small polyerathane spacers to get the MAF sensor positioned right.. So I reset the light.. Didn't get a chance to put them in.. light comes back on couple days later.. I reset again.. and install the spacers..

Couple weeks later.. It finally comes back on as I leave the dealership after getting an oil change and front shocks swapped..
I go back 2 days later for them to read the code/reset and tell me what they find.

Comes back with saying that the MAF sensor is thinking it is 400feet above see level but is reading I think lean.. can't remember..

If it is reading lean.. they obviously there is a problem with the sensor because the intake would provide more air causing it to be rich..

not sure.. either way..

lumberjack has installed a AFE intake system @ the same time, and has a 5.4L 3V same as me and hasn't had a problem.. So I am thinking it is a MAF problem..

Any suggestions.??

the Mass Air Flow sensor is $140 bucks and dealer wants 0.3hrs labour and 1hr ($95) for diagonostic time to verify it..

not sure..
swapping the MAF wouldn't be a problem.. not sure if i need the diagonostic time though..

if the sensor doesn't do anything should I pay for the sensor?? lol
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post #2 of 13 (permalink) Old 05-16-2008, 07:47 AM
 
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Seems to me that Woodstock is close to 400' above sea level so that shouldn't be a problem. I have the same CAI with no problems so far. If you have an Edge installed, there have been some discussions on other sites about the Edge leaning out the engine when a CAI is installed. Possible suggestion, if you have an Edge, would be to disconnect it, go back to stock for a tank full and see what happens. I'm just guessing here...

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post #3 of 13 (permalink) Old 05-16-2008, 07:51 AM Thread Starter
 
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Quote:
Originally Posted by truckpilot View Post
Seems to me that Woodstock is close to 400' above sea level so that shouldn't be a problem. I have the same CAI with no problems so far. If you have an Edge installed, there have been some discussions on other sites about the Edge leaning out the engine when a CAI is installed. Possible suggestion, if you have an Edge, would be to disconnect it, go back to stock for a tank full and see what happens. I'm just guessing here...
No edge.. I wish I had one.. but nope..

the sea level thing has got me all messed up..
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post #4 of 13 (permalink) Old 05-16-2008, 08:05 AM
 
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Quote:
Originally Posted by Viper238 View Post

If it is reading lean.. they obviously there is a problem with the sensor because the intake would provide more air causing it to be rich..
I'd recheck all the hoses, could be a vaccuum leak or a lose clamp? I have read where some CAI kits that have a 3.5" tube need to be tuned or they run lean. The 3" tubes don't need a tune.

If its getting too much air from the intake then that is running lean. To run rich is the opposite, too much fuel not enough air.

Clear the code again if you can then disconnect the battery for 15-30 min to clear all the tables then drive it for a few days to see if it comes back.


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post #5 of 13 (permalink) Old 05-16-2008, 07:34 PM
 
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The proper procedure after installing AFE CAI
is
Unhook battery for 10 min
Reconnect the battery start your truck and you have to let it idle for about 10 min
so the sensors can remap themselves
Let me know if this works
I got this from AFE engineers
Tim has an edge programmer you can borrow it from him to reset all the faults.
Make sure Tim resets his truck to stock before you borrow his programmer.



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post #6 of 13 (permalink) Old 05-16-2008, 09:14 PM
 
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Did you make sure the MBRP is still attached?

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post #7 of 13 (permalink) Old 05-16-2008, 10:53 PM
 
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Quote:
Originally Posted by Smokefan View Post
Did you make sure the MBRP is still attached?
or the glue they used is still on...


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post #8 of 13 (permalink) Old 05-16-2008, 10:56 PM
 
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Definatly unplug the battery for 10 minutes,then plug back in and let idle.
And more air would/should equal more lean,not rich.That is how cold air intakes work,and are designed to do(for us mustang guys anyways).Lean is mean as the good ol' saying goes,that is how you make hp,but you do not want to lean it out to the point of unsafe.Good luck.

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post #9 of 13 (permalink) Old 05-17-2008, 01:26 AM
 
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Quote:
Originally Posted by White Pearl View Post
Tim has an edge programmer you can borrow it from him to reset all the faults.
Make sure Tim resets his truck to stock before you borrow his programmer.

Well to save Tim from doing that you can borrow my X3, its still unlocked and I used it to check codes on my truck. I haven't used it as a programmer yet because my custom tunes will be another 7-12 business days. So if you are working at BB tomorrow I could drop by.


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post #10 of 13 (permalink) Old 05-17-2008, 10:58 PM
 
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theres problems like that which occur on the focus as well when people install certain CAI's, it'll cause the motor to run lean. i don't know why it happends but it just does, and there isn't much you can do about it unless you get a dyno tune or switch companies. keeping in mind that you've already let the ECU/PCM (whichever you like to call it) reset.

as for the car learning again, after letting it idle, take it out for a run and put the pedal to the medal.
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