YoungKadafi

Ive been having this problem for about 2 years now, when i put down 1/3-WOT of gas, my car just gets really really loud (exhaust,intake) but doesnt climb in RPMS at all. The problems are mostly in 2nd-5th. Lately its been in all rpms. Almost as if when I floor it, i start slowing down, but my engine is getting louder, like the breaks are being applied. RPMS stay the same. It does it worst when the car is warm.

I have replaced:
5 different intakes
throttle body
4 different fuel filters
6 different dizzy caps and rotor
spark plug wires
10 different spark plugs sets
Exhaust system (which helped a bit)
K&N air filter
motor mounts
wheels and rims
o2 sensor

Im running mobil1 syntheticfull 5w30 wiht mobil1 filter
I also run seafoam or cheveron through the gas tank every 3k miles.
I have seafoamed the car about 8 times since i had it, and still no help.
Only thing i noticed, was after running a bottle of seafoam through the gas tank, it seems to help alot.

I noticed lately, when my car is cold (water temp is not yet up to normal running temp), My car runs very smoothly, and accelleration is fine. But like the second its at normal running temps, im driving a tractor with a huge trailer on the back, and my 0-60 times are like 30 seconds. When cold my 0-60 is like 7 seconds. Is it a sensor of somesort? its either ignititon or fuel, ive upgraded all my air (intake exhaust header).

Its wierd i can be driving along fine, but the second i smash on the pedal, even at 5k rpms, NOTHIGN! just noise and it feels like I lose speed, untill i let off the pedal. Ive already replaced the TPS. Anybody know why my car is doing this when cold? thanks alot!

YoungKadafi

And i dont have any CEL, im thinking its my knock sensor because my car does vibrate ALOT because of the custom make motor mounts. Can I dampen the sensor at all?

DelSolMarine

injectors?

YoungKadafi

if they were bad, would they clog like 200 miles after you dumped a bottle of seafoam through it? cuz thats what it seems like

YoungKadafi

anybody?

99ctr

try replacing the speed sensor. i had a similar problem with my 99 si when the speed sensor/alternator fuse blew when i bottomed out my car and broke the o2 sensor. when i hit the gas it went nowhere, but sounded like it was accelerating