5sfe stops pulling above 4k rpms, :[ All you gearheads help me out! Options

[Mycurse180]

There's not much else I can say to describe the problem. The engine runs amazing from idle to 4000, but then at 4k I can feel it stop pulling [as in the power just seems to stop] and it just kind of hesitates there and bucks a little bit. I dont want to blow it up so I upshift as soon as it starts doing it.

I currently have no CELs, I checked the plug wires earlier and they look basically brand new and all seem to be connected properly. The prev owner was a member here and had NGK plugs put in. I'm thiking of replacing the plugs but not sure what else would cause this problem.

Thanks for any input.

[presure2]

can you take a vid of it happening?

the 5s really runs out of steam above 4400rpm, but sounds like your having more of a problem than just the normal 5s choking out up top.

[95CelicaST]

Know the previous owner's username?

[Smaay]

that is exactly what my Supra did when the timing was off by 1 tooth. maybe your belt slipped

[Mycurse180]

@ PRESURE No chance of a vid at the moment bro. I understand about it running out of power at 4000+, that's what the PO told me when I was raging about this. But I also know it's not a diesel truck and if I want to rev it to 6000 it sshould do that no problem. Everything just seems to come to a halt at 4000 though.

@ 95CELIST Not a clue man. The car is stock except for intake.

that is exactly what my Supra did when the timing was off by 1 tooth. maybe your belt slipped

How do I check the timing?

[Bitter]

that is exactly what my Supra did when the timing was off by 1 tooth. maybe your belt slipped

It sounds possible, given that its probably got higher miles or could be over due for timing belt.

[injection]

I had a mazda rx-7 that did the same thing @ 5000rpm the plugs looked fine but changed them anyway, and the problem was resolved....I know a rotary engine is very diff from 5sfe, but it mightbe your problem. combustion is combustion.

[Smaay]

get a timing light and hook it up to your battery and the the flasher up to the #1 spark plug wire. it will flash each time that plug fires. point it at the crank pulley and see where the timing is. oh before you do that you have to jumper Te and E1 on the diagnostic box, that will put you in test mode

[Bitter]

And it should flash at the 10 mark if its all in time correctly, just FYI.

[stephen_lee]

yeah im willing to bet its a timing issue. i've done many t-belts (one on a 5s) and if they're off one tooth they either idle like shiit, and run great at high rpm, or they run great at low rpm, and like shiit at higher rpms (the 5s bogged around 4000-4500 when it was a tooth off, btw)

[Tigawoods]

well mine does the exact same thing, but everything is timed right. changed the plugs too.
runs like normal in the midrange

[Mycurse180]

well mine does the exact same thing, but everything is timed right. changed the plugs too.
runs like normal in the midrange

What the hell could this be man?

[bloodMoney]

well mine does the exact same thing, but everything is timed right. changed the plugs too.
runs like normal in the midrange

I'm really surprised to hear that especially with the new cams.....

[Mycurse180]

bump

[stephen_lee]

guys the 5s is at an angle, so the cams will be a bitch to set. PLUS you have to make sure theyre lined up with eachother. im betting thats both your issues

move timing one tooth forward, test
move timing back 2 teeth, test.

[b22ri22an]

had a problem similar to this in a 280zx, ended up being a clogged fuel filter, the fuel pressure couldnt get high enough to push the power above 3500 rpms on my z it would lope between 3400 and 3500 rpms and not push any further. changed the fuel filter and i was able to push it into the low 6ks just fine.

This post has been edited by b22ri22an: Feb 7, 2011 - 8:30 AM

[presure2]

guys the 5s is at an angle, so the cams will be a bitch to set. PLUS you have to make sure theyre lined up with eachother. im betting thats both your issues

move timing one tooth forward, test
move timing back 2 teeth, test.

im wondering if the cams are in there correctly.

mike, did you follow the BGB for installing the cams, following the matchmarks on the slave gears?

[DGolden32]

I'm having the same problem, but there is no bucking or sputtering. I just have dramatically reduced power at 4k, and almost NO power at 5.5k. New timing belt, thrice-cleaned throttle body, and still nothing.

I DID, however, have the problem of the car lurching as if to lose all power for a split second above 3k, turns out the plug was somehow partially yanked out of the cam sensor and the sensor itself was damaged.

[DGolden32]

FIXED!!!!!! Try, if you have not already, replacing the fuel filter. Mine was so clogged one could hardly blow air through it. hello 30 hp :}

FIXED!!!!!! Try, if you have not already, replacing the fuel filter. Mine was so clogged one could hardly blow air through it. hello 30 hp :}

[Mycurse180]

FIXED!!!!!! Try, if you have not already, replacing the fuel filter. Mine was so clogged one could hardly blow air through it. hello 30 hp :}

FIXED!!!!!! Try, if you have not already, replacing the fuel filter. Mine was so clogged one could hardly blow air through it. hello 30 hp :}

I will have to try this. Where is the fuel filter located on the Celica?

I'm gonna try

plugs
timing belt
fuel filter