Rx7MPGUY84

my 1988 turbo rx7 is having issues. not suprising. i start it up and it runs fine and when i get moving it works good 2. when the turbo kicks in its strong and it feels fine. this is gonna be hard to explain but bare with me. i do a quick run up and down the street but after the first time going up the road it spools great in all gears, but on my way back it doesnt go fast at wot. it stutters alot at only like 2200rpms. but when i shut the car off and turn it back on, it works. so what do u guys think. thanx

SonicRaT

iTrader: (6)

Did we ever check the TPS for bad spots? What pressure sensor/AFM were you using? Fuel cut is only temporary at WOT, when the boost hits ~8.5psi

Rx7MPGUY84

ur right i dont think we checked the tps for bad spots.poo. ill hook it up to a multimeter. im using the right afm. and i think the boost sensor is the right one. if its not ill pick up another one. any other ideas what it could be

TurboII2NV

how much boost are u running with all those mods u probably need a fuel cut defender

and u need a T2 pressure/boost sensor

Rx7MPGUY84

any body got the code for what the pressure sensor. the part number i mean.

Rx7MPGUY84

any body? how about this, the secondary waste gate. or w/e its called the lower one nearest to the exhaust manifold, whats the plug called that plugs into the control thing for that. could that do it. is it the twin scroll actuator plug or the boost plug. if not where the hell does the boost one go. i have no vac rack and i just threw it out without thinking, hmm where does these all go. thanx

TurboII2NV

hmmm the twin scroll wouldnt do that kind of sputtering u are explaining
it might give u a little power loss on low RPM now but no cuts
and u are saying the turbo spools good and strong

Rx7MPGUY84

okay what could it be. not injectors i think cuz it doesnt sputter when its cold and on its way of getting warm. but when it is warm it does sputter. any other suggestions. im going insane. its no way my second injectors right? i did the grounding stuff already, and when i restart the car on and off while driving and i restart it, its perfect again. im thinking its a pressure sensor problem.

SonicRaT

iTrader: (6)

Pressure sensor or water thermo sensor. Pull the error codes off the s4 ecu.

Rx7MPGUY84

what color is the wire that goes to the water thermo sensor. is it the green colored one or what. cuz the kid i bought the pressure sensor from says that it worked before he took it out. so idk whats wrong. i think ill check the water thermo senor. thanx

Rx7MPGUY84

bumpity bump bump

SonicRaT

iTrader: (6)

What's the number on your pressure sensor. N3??. Also, the water thermo sensor is on the back of the waterpump with a green connector.

Rx7MPGUY84

the connector is missing for the water thermo sensor, is it the green wire. the number on the pressure sensor is... n318 i found the sensor plug sorry. its hooked up. what to do...

Rx7MPGUY84

sonikrat why dont u ever answer ur damn aim. yeah i talked to another person with t2 and they say its the right one. u think its the profec a i have hooked up. i bet u $100 its the problem. i cant figure out how to program it. its not working right i dont think. ill see if its that.

SureShot

Rat mentioned the short range TPS way back at the start.
I'll bet you have a resistance drop out at part throttle.
At first that condition likes to hide until after it gets hot under the hood.

Rx7MPGUY84

so what do i do? switch tps's? i have like 3. so ill switch em out when its cooler out. if thats not it u owe me a rx7 sure shot.lol how far is orange park from new port richey?

SureShot

I'm up near Jax.

It's easy to test a TPS with a cheap needle type meter.
Set the meter on the 1K ohms scale and clip on to pins A & B.
(I clipped this from the FSM)


Hold off the throttle & work the TPS plunger in & out.

The needle should sweep SMOOTHLY from near 0 to near 5K.

If the meter needle jumps around during the stroke, the TPS is worn out.

OverDriven

My TII does something KINDA similar. Run it hard and it sputters in the top of 2nd, 3rd, 4th, and 5th. I'm obviously hitting fuel cut due to big exhaust/intake and not having ported my wastegate yet. I'm just going easy on the car till I can pull the turbo.

-Joe

Rx7MPGUY84

yeah urs id def prob fuel cut over. ryde or die says it might be the resistor thing for the fuel cuz the 87's were high impedence i think and the 88's were low. would that be the problem. why does it fix its self when i restart the car??? im gonna swap the tps and see if that helps at all. ill post how it goes.