air filter box
#1
#7
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#13
All that will tell you is if the element is totally open, it won't tell you if it is getting the proper signal when heated.
#14
In the tune there is a chart called the MAF transfer function. When tuning.. this is the very first thing you address.
If you change the MAF in any way.. and you want the truck to have the proper air / fuel ratio? You'll need to adjust this in the tune. without doing so your A/F will not be right from idle up to about 90% throttle. (rpms don't matter)
Sounds like your trying to go cheap.. but in reality you need to find out the root cause. Otherwise your just guessing and throwing parts at it.
You can rule the MAF sensor out by just dis-connecting it. When you do that there is a "out of spec" chart that the tune uses as a default.
Yes it'll throw a CEL but the truck will run smoothly if it is indeed a bad MAF.
If it still jerks with it unplugged? The MAF or airbox/filter is not the problem.
Rich
If you change the MAF in any way.. and you want the truck to have the proper air / fuel ratio? You'll need to adjust this in the tune. without doing so your A/F will not be right from idle up to about 90% throttle. (rpms don't matter)
Sounds like your trying to go cheap.. but in reality you need to find out the root cause. Otherwise your just guessing and throwing parts at it.
You can rule the MAF sensor out by just dis-connecting it. When you do that there is a "out of spec" chart that the tune uses as a default.
Yes it'll throw a CEL but the truck will run smoothly if it is indeed a bad MAF.
If it still jerks with it unplugged? The MAF or airbox/filter is not the problem.
Rich
Last edited by wydopnthrtl; 03-06-2009 at 09:11 AM.
#15
You can rule the MAF sensor out by just dis-connecting it. When you do that there is a "out of spec" chart that the tune uses as a default.
Yes it'll throw a CEL but the truck will run smoothly if it is indeed a bad MAF.
If it still jerks with it unplugged? The MAF or airbox/filter is not the problem.
Rich
UP DATE: i just went out and drove it w/o the maf connected and it shifted hard but the jerking / bucking wasn't there so i think its the maf sensor?
Last edited by skyway0018746; 03-06-2009 at 05:40 PM.
#16
The PCM in a car is a computer. In that computer there is a "tune". Whether it's stock or been reflashed by an aftermarket thing like a x-cal.. doesn't matter for the issue your having.
Since you unplugged it and it no longer bucked.. it's definately related to something between your throttle body and the MAF. More than likely it's the MAF it'self. But... it could be a leak between the two. (the hard shifting is normal too)
Some have reported a air filter box that's not sealed properly causing the same thing. I'm not sure I buy that one.. but it's been reported here at R-F. Might check that.
If everything is properly sealed and you don't have any leaks... it's just about got to be the MAF sensor.
Rich
Since you unplugged it and it no longer bucked.. it's definately related to something between your throttle body and the MAF. More than likely it's the MAF it'self. But... it could be a leak between the two. (the hard shifting is normal too)
Some have reported a air filter box that's not sealed properly causing the same thing. I'm not sure I buy that one.. but it's been reported here at R-F. Might check that.
If everything is properly sealed and you don't have any leaks... it's just about got to be the MAF sensor.
Rich
#17
#18
Check out tousley ford. They give the SVT crowd a 10% over cost price.
Also, check out rock auto or the local autoparts places. IMO.. this type of part is not worthy of standard ford service pricing. It's not like they are rebuilt and wear out. No matter what you buy it's going to be new with a warrenty.
Rich
Also, check out rock auto or the local autoparts places. IMO.. this type of part is not worthy of standard ford service pricing. It's not like they are rebuilt and wear out. No matter what you buy it's going to be new with a warrenty.
Rich
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