not revving over 4k

[trendyslide]

i jus don't get it anymore.

new plugs, wires, fuel filter, octane booster, air filter, the works...but the car still doesn't rev over 3-4k....sometimes it will but sometimes it won't.

you can hear the intak filter sucking in air but the car isn't firing properly...any ideas?

[killakingquan]

MAF it will still suck in air but malfunction , check that , sounds like the problem

[Clarkbar]

not your maf take your fuel pump out and check, may be rust or dirt in tank,

[Camo]

+1 on fuel pump. may also be a bad ground. When we got Katies hatch it wouldnt go over 3-4k until I replaced the missing body ground. Check for a good connection and clean

[trendyslide]

which ground>?

[pete240]

did you check the flux capacitor they like to go out in the summer.......

[mazdarati]

+1 on checking fuel pump. when it gets up to 4k, does it just feel like its out of power? are you misfiring? have you checked what shape the plugs are in? I had the same problem with the RX, only between the 6-8k range and it was mostly TPS and timing, the other part of it is in the manifold, but that doesn't relate to a 240

[trendyslide]

misfiring yes, it jus sounds like no fuel is getting in, but i know there is cause i changed the fuel filter and there was pressure and fuel.

[Camo]

just because there is pressure doesnt mean there is enough volume. We get that all the time at work. Even though the pressure reads within spec, itll die off w/ rpm. If you have another pump, swap it, its easy

the ground I fixed on Katies car was the main ground. Goes from battery to fender to engine