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| 2004 to 2008 F-150 and Mark-LT 4.2L, 4.6L and 5.4L equipped F-150s and Mark-LTs. |
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#1
Fri, December 10th, 2010, 05:17 PM
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With a CAI installed in conjunction with a slot style MAF=Custom tunes are a must.....
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#2
Sat, December 11th, 2010, 01:54 AM
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I recently became concerned. I hit the gas the other day, at around 30mph, and as it accelerated I heard a misfire. I have a 06 F150 SCrew FX4 5.4L 3V with 54K miles. I would not expect a misfire at 54K...am I correct to expect that I am running lean? How bad is this for my truck? (probably a stupid question) This misfire has happened twice...especially since the temp has dropped and the fuel switched to 89 octane winter gas
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#3
Sat, December 11th, 2010, 09:24 AM
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You need to drive like somebody's grandmother if you want to avoid damage. Do you still have the original stock intake? You might want to switch back to that.
Do you have any trouble codes?
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#4
Sat, December 11th, 2010, 11:19 AM
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No trouble codes ever. I do have the stock intake. Honestly, should I just put the stock intake back in and bring it to the shop to hook up to a meter...or should I leave the intake on and quickly order my Gryphon? The last thing I want to do is blow out a cylinder because its running lean
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#5
Sat, December 11th, 2010, 11:23 AM
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I would put the stock intake back on until you have custom tunes.
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#6
Mon, December 13th, 2010, 10:07 AM
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Popping sound during acceleration
The popping sound has only happened twice, down the same stretch of road, 2 minutes apart. Both were right after I really whomped on it. Could it have just been bad gas (most of the fuel I use is 89 octane 10% ethanol) or am I most likely running lean? Can a local shop check to see if I am running lean?
I have the stock intake but it is 3 hours away and is a pain to reinstall...it would take me at least a month or two to get my Gryphon if I tried to order it now with the holiday. Thanks for your help guys
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#7
Mon, December 13th, 2010, 10:43 AM
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It might have been bad gas, might be overly lean, there are a bunch of possibilities. I wouldn't be romping on it too much because you are for sure running leaner than you were before adding the intake, no way to avoid that on a stock vehicle. You are going to need that MAF sensor recalibrated to compensate for the larger diameter tube around it.
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