car running like crap after tune up...WTF?

[bigDogs02GT]

Changed the plugs (Bosch Platinum 4+), fuel filter and cleaned the K/N filter, now the damn thing surges and bucks. It does it mostly if I'm going like 25-30mph and lightly on the gas (have to go that slow on post) and when on the highway and let up it surges and jumps too. Almost like it's starving itself of fuel. What's going on? Anyone got a clue............

 

[codered97]

get rid of the spark plugs. You can run those on your car. I would just stick with motorcraft or ngk.

 

[stangman]

Changed the plugs (Bosch Platinum 4+), fuel filter and cleaned the K/N filter, now the damn thing surges and bucks. It does it mostly if I'm going like 25-30mph and lightly on the gas (have to go that slow on post) and when on the highway and let up it surges and jumps too. Almost like it's starving itself of fuel. What's going on? Anyone got a clue............

did you let the k&n dry before you put it back on?


if you didn't... it's your MAF, i guarantee it. that liquid cleaner from k&n will get on your maf & jack it up if you don't let it dry for quite a while

 

[bdcardinal]

did you put the fuel filter in backwards? also why did you use those plugs? they suck ass on the 4.6 motors. stick with motorcraft or autolite.

 

[bigDogs02GT]

That's what Advance recommended. I dont think its the MAF. I let it dry real good for a few hours. I checked to see if it has any codes even though the light isn't on and there are no codes. Didnt mess up the fuel filter. Arrow points towards the front of the vehicle. Any more ideas, I am really dumbfounded and getting P***ed off.

 

[bigDogs02GT]

If it might be the MAF, what should I clean it with. I have some Valvoline Carb and throttle body spray.

 

[stangman]

That's what Advance recommended. I dont think its the MAF. I let it dry real good for a few hours. I checked to see if it has any codes even though the light isn't on and there are no codes. Didnt mess up the fuel filter. Arrow points towards the front of the vehicle. Any more ideas, I am really dumbfounded and getting P***ed off.

MAF

take the filter off & check the inside of the maf, the oil has gotten on it. that or did you wash the engine off with a hose?

 

[bigDogs02GT]

What can you clean the MAF with? All I have is Valvoline Carb/TB spray.

 

[bigDogs02GT]

Havent washed the engine in quite awhile. It ran fine until I changed the plugs, fuel filter and cleaned the K/N

 

[bdcardinal]

take those plugs out and bring them back. they dont run well in the 4.6 motors. just run autolite coppers or the autolite OEM equivilants. and for the love of god stop taking advice from people at Advance Auto Parts. never take advice from parts people. they are told to always upsell to platnium plugs.

 

[Big Steve]

That's what Advance recommended. I dont think its the MAF. I let it dry real good for a few hours. I checked to see if it has any codes even though the light isn't on and there are no codes. Didnt mess up the fuel filter. Arrow points towards the front of the vehicle. Any more ideas, I am really dumbfounded and getting P***ed off.

I let my K&N dry for a couple of days. If you oil it while the cotton is still wet the oils traps the water in the media and restricts flow. I keep a paper filter around to use for cleaning days. I only use electric contact clener to clean my MAF since it leaves no residue. Carb clean and brake clean leave residue no matter what the can says. Oh, and get those damn Bocsh plugs outta there like the other guys say. They aint worth a rat's ass.

 

[bigDogs02GT]

Cleaned the MAF with contact cleaner and it still the same. Guess tomorrow I'll change the plugs again. Any part numbers you guys recommend?

 

[bdcardinal]

Autolite 764 if you want performance, or Autolite APP764 if you dont want to change then for 100k miles

 

[bigDogs02GT]

Could it really be because of the plugs? Didn't know the bosch's were crap. The guy tried to sell me the Denso's for $108 but I caved to the bosch's

 

[bigDogs02GT]

I'll get the 764's tonite, although I gotta go back to Advance to get em, no other parts places near me.

 

[bdcardinal]

Could it really be because of the plugs? Didn't know the bosch's were crap. The guy tried to sell me the Denso's for $108 but I caved to the bosch's

the bosch's work great in cars they were designed to be used in. with your mods, i dont see a need to use anything other than stock or copper.

 

[bigDogs02GT]

I know this thread is gettting old and I really appreciate the help. I really didn't know plugs could cause a stock motor to run so shi**y.

 

[bigDogs02GT]

Oh almost forgot should I gap the 764's to the specs in the Haynes manual?

 

[Will Smith]

double check the plugs. onbly plugs I would use are Autolite or motocraft for regular usage or if u have a supercharge/turbo/nawz use either Denso or NGK Iridiums.

 

[bdcardinal]

Oh almost forgot should I gap the 764's to the specs in the Haynes manual?

yup. they are copper so they are safe to gap.