the car spudders and spits when it hits 5500 rpm in third gear,4500 in fourth only when i step on it any ideas what it could be? the vtec kicks at 5500. d16z6 is the motor

 

I'm in same boat, but I might be able to pass on a few suggestions. Are you getting any CELs?

Maybe Knock Sensor, VTEC Pressure Switch, or VTEC Solenoid Valve.

Let us know what you find out.

 

well the good news is i fixed it, i adjusted the valve lash. it was off one thousandth and made worlds of difference. i also put on a B&M adjustable fuel regulator, drove it for a while and it happend again. i was like wtf[:@]so i checked the plugs. and it turns out the number three cylinder plug was broken. dont ask me how it happend i have o i dea but i changed the plug and it runs real good.no misses. NOTHING.

mine doesnt have a knock sensor i forgot to add that i swapped in a built up Z6 thats bored 20 over,eagle rods,je pistons,gude head,golden eagle blockguard aem fuel rail,and keihin injectors. and thanks a lot for the input.

 

vtec problem is like an oxymoron. WOW. I didn't know such a problem could even exist!

 

my one buddy had a problem with his on his hatchback witha gsr motor, he had to put a new switch in it. other than that ive never either.

 

Iv got the same problem! anly mine does it as the vtec kicks in an iv lost my vtec power??? ill try anythin 2 fix it. So wat is the lash valve an where is it on the car?

 

High end sputtering is usually ignition related with plug wires being the most likely culprit.

 

would ignition leads that are faulty make the malfuction indicator lamp come on on the dash?