Ok here we go i had this problem before i took off the turbo now it is NA again and the problem is back. At 5,000 rpm it falls flat on its face with no gas, AF gauge goes flat.

Replaced computer 3 times
replaced fuel injectors 2 different sets
replaced fuel filter
replaced Fuel Reg,

Did every thing but replace the fuel pump
its is a NA DOHC ZC

Just as a second, third fourth ect opinion. I have replaced everything BUT the motor replace the Fuel Pump?

TIA

 

this happens in any gear at and engine temp?

any popping noises from exhaust? any other noises?

WAS turbo, so do u have a AFC w/ 450cc's or the OEM Inj back on?

 

no popping also have to turn the key on and off 3 times on a cold start up. No AFC stock injectors in. No other noises that would be odd. I think It is the stock fuel pump that has about 246,000 miles on it or close to that

 

i not so sure the fuel pump is you problem but id definately change it out

 

you have to prime the thing 3 times before starting it? do you try to crank it each time or just on -> off ?

noticed any bad fuel milage?

 

fuel miladge never was great. Turn on let it cycle (check engine light off and fuel pump stops) crank no start. stop trun key on off cycling 3 times then it fires right up. no fuel leaks.

 

that 3x and then it finally starts?

how new are the plugs, wires, cap, rotor, ignitor, coil?

 

Sounds like your fuel pump cant hold pressure when its turned off.Its leaking it back into the tank. Falls on its face do you mean it wont go beyond 5k. can you just rev it with the car parked to 5k and beyond if it doesnt sqirt some carb cleaner in their and see if it revs beyond that then.

 

plugs ect brand new. ignitor, coil havent tested them.....


Car parked its great Just under ANY load like driving falls on its face around 5,000 rpm

Checked the TPS about 5 times. Um i think thats it lol

lets diagnose this puppy lol

 

man.. so many "could be this" things to change/check.

things i would replace, whether or not they solve the problem can't hurt to be new.

start w/ pump, its old like you said.
then coil/ignitor (after market?, MSD?)
check injector seals for leaks.

whats the vac/boost gauge read, SB 0vac