ok i have a 1999 4x4 5.4 with true duels and flowmaster 40s no cats.........it fells super sluggish at ne rpm under 2grand like its going to bog down no low end.....im guessing this is lack of back pressure......so do i just need to add some hi flow cats? what should i do?
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Last edited by RideRed31B; 10-25-2009 at 04:58 PM.
__________________ 2006 F150 XLT 5.4 4x4 Performance: Cheap ebay CAI w/ K&N filter, Delta Force tuning Exhaust: Stock manifolds, NO cats, 2.5" true duals, Magnaflow X pipe, Original 40 Series Flowmasters, 3.5" stainless tips Other mods: Nathan Airchime K3LA locomotive horns Exhaust videos: Idle, rev and hammer it! Cruising by Pulling up to an idle Inside accelerating and cruising
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just after geting this, i had true duels with glass packs and the cats on when i got the truck and it ran fine....i think there 2.5s or 2.25 im not 100%....it seams like its geting worse the longer i have this set up but it has a bad chugging sound/ fell when ur doing about 30 and barly on the gas.....if u get on it hard it fells great tho
__________________ 2006 F150 XLT 5.4 4x4 Performance: Cheap ebay CAI w/ K&N filter, Delta Force tuning Exhaust: Stock manifolds, NO cats, 2.5" true duals, Magnaflow X pipe, Original 40 Series Flowmasters, 3.5" stainless tips Other mods: Nathan Airchime K3LA locomotive horns Exhaust videos: Idle, rev and hammer it! Cruising by Pulling up to an idle Inside accelerating and cruising
MAF? gussing something air flow? i also have a k&n kit if that could afect nething and i never changed nething with my o2 sensors on check engien light is still on
CELs on cuz you dont have any cats, MAF-mass air flow. get some MAF cleaner and clean that first, sometimes the oil from the K&N filter gets on the little wires and messes up. try that first before you buy a MAF
You really need to tune that truck if you don't have cats, or buy o2 simulators if they make them for your truck.
__________________ 2006 F150 XLT 5.4 4x4 Performance: Cheap ebay CAI w/ K&N filter, Delta Force tuning Exhaust: Stock manifolds, NO cats, 2.5" true duals, Magnaflow X pipe, Original 40 Series Flowmasters, 3.5" stainless tips Other mods: Nathan Airchime K3LA locomotive horns Exhaust videos: Idle, rev and hammer it! Cruising by Pulling up to an idle Inside accelerating and cruising
ok well i cleaned the maf and drove it around the block and there was no difference.....eather it takes time or the maf is shot......and im gota look for o2 simulators or a cheap tune what do yall recomend?
I ghave 2.5" duals and pre-cats on my truck and it runs fine at 80k, your probably due for a tune up. Have you changed your fuel filter, spark plugs/wires, cleaned your throttle body? Have you ever over oiled your filter?
Theres no real such thing as a cheap tune, its best to have it done customly to your truck. Power Hungry Performance will hook you up well with a programmer for $399 and $30 per custom tune.
well when i cleaned the MAF the wire was orange the same color as the k&n oil i cleaned it and it looks good as new but it didnt help at all......after all yall have said im thinking get a tune up and check the throtle body, fuel filter and pump and MAF....how can i go about haveing theses checked so i dont end up haveing to buy stuff i dont need untill i get it right?
well when i cleaned the MAF the wire was orange the same color as the k&n oil i cleaned it and it looks good as new but it didnt help at all......after all yall have said im thinking get a tune up and check the throtle body, fuel filter and pump and MAF....how can i go about haveing theses checked so i dont end up haveing to buy stuff i dont need untill i get it right?
A dealership diagnostic would be the best solution. They find anything. But with no cats they may try saying thats the cause, but the computer does not lie. I had a CEL last winter, took it in and it was the fuel filter, insufficient fuel flow
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