Rb20 Dying At 4500 Rpm

[smokey34]

hey i need help i have a skyline with a rb20det it is dying at 4500 rpm, it doesn't shut off it just wont rev over 4500

i tryed a new mafs and 6 new super spark coils, sometimes the car starts jerking i just put the clutch in and it stops

now i have a spare engine and i tryed changing the ignition amp the ecm the crank angle sensor and the coil harness.

i'm running out of options and hoping someone can give me some suggestions

thanks alot dave

[JiN_MaN]

All hoses hooked upto the boost controller?

[smokey34]

All hoses hooked upto the boost controller?

yea all hoses are hooked up

it's just like you turn the key off and it picks up instanly

[The Dan]

Exhaust blockage?

Fuel Pump/Filter?

[smokey34]

Exhaust blockage?

Fuel Pump/Filter?

the exhaust doesn.t seem to be blocked. i never changed the fuel filter but i did check the fuel pressure and flow it was alright.

[_Ryan_]

TPS?

[Benzino33]

tried resetting the ecu?

[B0oStEr]

It could be the coolant temp sensor.

[drf76]

the exhaust doesn.t seem to be blocked. i never changed the fuel filter but i did check the fuel pressure and flow it was alright.

if u have never changed it..just do it. simple things sometimes fix everything. pressure might be dropping of under boost. how did you check fuel pressure? mighty vac on the fuel pressure reg to test the pump over various pressures,

does it cough/splutter? does it matter if you at full throttle can you get over 4500 with half throttle? sorry for all the ? just want to help.

lucas

[smokey34]

TPS?

yea i bought a used engine and i switched the tps. it didn't seem to help, that tps might be no good.

now i set it up with the laptop at .5v now is there a nother setting using the multi meter back probing the plug.

thanks

[smokey34]

It could be the coolant temp sensor.

is that on the top rad hose. there is 2 of them side by side

thanks

[smokey34]

tried resetting the ecu?

[smokey34]

tried resetting the ecu?

no i didn't this is my 3rd ecu one would crank but not start the other had # 2 and # 6 cylinder dead and the

the last one seems to running fine except for the reving

how do you reset the ecm.

thanks

[smokey34]

if u have never changed it..just do it. simple things sometimes fix everything. pressure might be dropping of under boost. how did you check fuel pressure? mighty vac on the fuel pressure reg to test the pump over various pressures,

does it cough/splutter? does it matter if you at full throttle can you get over 4500 with half throttle? sorry for all the ? just want to help.

lucas

no the fuel filter is my next step when it dies out then it sputters, it is about 3/4 to full pedal. we checke dthe fuel pressure by tapping into the fuel line with a tee, how do u test it at the fuel pressure regulator.

thanks

[B0oStEr]

is that on the top rad hose. there is 2 of them side by side

thanks

It's the one with the injector style plug.

[Sheriff Wan]

I'd be looking at fuel related things.

Did you check the flow at idle? if so it would be very different at 4,500 rpm, could still be fuel pump

Also is the ecu standard? check that it hasnt been played with.

Also check that your timing is in check

[smokey34]

I changed the fuel pump, brand new one and it's still doing the same thing.

anymore ideas?

I'd be looking at fuel related things.

Did you check the flow at idle? if so it would be very different at 4,500 rpm, could still be fuel pump

Also is the ecu standard? check that it hasnt been played with.

Also check that your timing is in check

[smokey34]

hey i need help i have a skyline with a rb20det it is dying at 4500 rpm, it doesn't shut off it just wont rev over 4500

i tryed a new mafs and 6 new super spark coils, sometimes the car starts jerking i just put the clutch in and it stops

now i have a spare engine and i tryed changing the ignition amp the ecm the crank angle sensor and the coil harness.

i'm running out of options and hoping someone can give me some suggestions

thanks alot dave

hey everyone i would just like to thank you guys and gals for helping me fix my car

i found out that my new mafs is the problem

i swaped it out and it works better than ever

thanks again dave