losing power furthur up the tach

so my saturn is doin something ive never seen before. i have a 2000 SL2 with the DOHC engine and a 5 speed tranny. i got the car a few months ago and so far i have put it a timing chain, gears, tensioner, and guides. the diff pin went so i managed to get another 5 speed WITH a clutch, pressure plate and throw out bearing for 350 bucks. anyways whats goin on now is when i floor the car it runs fine until you get about 4500 rpms then i noticed a power loss, once it hits 5500 the power loss is so noticable that it wont pulls the car past 5500 rpm in any gear. i cant figure it out. i cant remember if it did it before i put the timing chain on, or before i put the trans in. the car runs fine and has plenty of power as long as its below 4000 rpms. I know i put the timing chain in right. how ever wheni was putting the trans in my friend didnt disconnect the speed sensor and may have put the 2 wires in backwards. would that make a difference? im kinda lost here. i definitly dont wanna pull the motor AGAIN. any help would be greatly appreciated. thanks guys!!!

Your car has a pre-cat. This sometimes falls apart and clogs the pipe. Remove the o2 sensor and run the car. See if it runs better. If it does, it is something with the exhaust.

I dont think the VSS wires matter. Not positive though

Your car has a pre-cat. This sometimes falls apart and clogs the pipe. Remove the o2 sensor and run the car. See if it runs better. If it does, it is something with the exhaust.

I dont think the VSS wires matter. Not positive though



are you talking about the little canister one immediately after the collector on the manifold? if so, i already cleaned it out when i had the motor out for the timing chain. im gonna clean the other one out in a bit to see if that helps. ill keep you posted. a nice thing about this county is we dont have emissons yet

i took off the catalytic convertor and punched it out, and removed the resonator also. car runs great and has alot more snap to it. when we unbolted the cat, there was a bunch of dust from the pre-cat so i think thats what was cloggin the main cat.

i took off the catalytic convertor and punched it out, and removed the resonator also. car runs great and has alot more snap to it. when we unbolted the cat, there was a bunch of dust from the pre-cat so i think thats what was cloggin the main cat.

Nice.

Unfortunately your SES may turn on since you long longer have a CAT. The rear o2 sensor is designed to make sure the cat is working. Start saving up for a high flow cat :D