so about a month ago i got in my truck and my low end power just wasnt there, the problem seems to be getting worse with time. my buddy said it mite be the tps, so i figured i would unplug it to see if it ran worse and it ran the same with the exception of some crazy shifting, shouldnt it not run right without a tps? and im thinking my throttle bodie and elbow between the throttle bodie and the plenum need to be cleaned, with 125xxx miles should i look into that?

o i got an 01 5.4

 

when is the last time you changed the cops? plugs? cleaned the tb and elbow? have you done a compression test? when is the last time your truck had basic maintainence?

 

just changed the plugs a week ago, with motorcrafts, changed the fuel filter at the same time, i never cleaned the throttle bodie or the elbow since i owned it. i didnt do a compression test but im wishing i did when the plugs were out. i just put in highflow cats, it has a flowmaster 40 series, electric fan and a cold air intake and a transgo shift kit

 

unplugging the tps wont do anything but make it run bad. Did the torque loss happen right after the highflow cats?

 

well thats wat makes me worried about the tps it didnt change anything other than the shifts it still had the same power, and no the cats didnt affect it

 

leave it plugged up and look at other options. see if you have any codes. sometimes you do, and the cel isnt even on

 

i didnt have any codes when i scanned it when this first started happening, im gunna try again to see if one popped up without a cel, could it be front 02 sensors?

 

those would cause idle issues mostly..

 

The TPS sensor is mainly for the transmission... but it does play a role in some regard to the engine's performance. However unplugging it will not attempt to fix the problem. I'm surprised you didn't get a CEL for driving it around unplugged.

It sounds like you need to run some fuel injection cleaner through it. I highly recommend BG44k.

 

that i did get a cel from but it happened soon i as i started it so i knew exactly what it was, and were can i get this injector cleaner

 

That BG44k is kind of hard to find... your local Ford dealer should have some... or if you call around, ask if they sell BG products, specifically that BG44k engine cleaner. That is what Ford uses at the 100k tune up. I think you run it when there is a 1/2 tank or less. I've ran it in my truck at less than 1/4 of a tank and then drive it like a maniac... or if you want to do it a little safer, just keep it in 1st, and floor it around a little bit... between the high rpms and such, it will flush all the gunk out of there.

 

so today i ran some sea fome through the brake booster hose, cleaned my mass air sensor and changed my pcv valve and it seems better but know i think im hearing a vacume leak, how could i find somethng like that and do these plastic plenums crack at all

 

How big does that vaccumn leak sound? Did you check the PCV elbo behind the throttle body?

Sometimes the aerisol spray test can identify a leak. Just spray a vapor of carb cleaner or similar flamable product around the intake manifold while it's running, and see if the rpm's change.

 

You can gain some from TPS adjustment. But first you have to check to see if it's out. Mine was. I had to slot and tip it down because it wasn't adjustable. Heres how much I had to tip it to bring within spec - You adjust KOEO .99 or lower. Mine was 1.03 before adjusting.



I used Coil bolts to hold her down.

 

it doesent sound to big but what is the pcv elbow behind the tb? i only thought there was one pcv on the valve cover