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?

 

Has it always ran like that with this setup?

 

what size pipe???

 

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

 

Mine did that some. I have a Magnaflow SIDO and HiFlowCats. Turned out to the the MAF. Got a refurbished one. Runs like a champ now.

 

Ya that's not exhaust related

 

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.

 

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?

 

if you have 2.5" you lost a little low end tq. check ur throttle body also, could be clogged up and ready for a cleaning or a new bigger one.

 

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?

 

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

 

dont they have those diagnostic things at pepboys and autozone?