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I have an 02 spec v 2.5 which overheated. I replaced the headgasket, put everything back together and the damn thing wont fire up!!!! I checked the fuel pressure and it read 54 psi and it holds fuel pressure. Scanned the ECU and and it gives me ETC codes and TP sensor codes. But no crank or cam sensor codes or MAF codes. The damn thing is flooding the engine with fuel!!!!! I spray starting fluid and it starts if you accelerate it. But I wont accelerate once its running, due to excess fuel. I dont think its the pump or crank sensor, I am leaning towards the ECU causing the injectors to stay open. What do you think??? I have also replaced the ETC Unit. Please help I have been fighting with with car for more than 2 weeks now!
did u time it right? ETC code would throw if timing is off.
Yeah I get Throttle position signal high, Voltage high.
I also get Throttle actuator problem, Throttle voltage high
If the timing is off, would it cause the engine to flood??? What controls how much fuel is being injected??? Because the damn thing is flooding like there in no tomorrow!!!!!! I mean you can see it in the oil where it gets diluted with excess fuel.
Sounds like your Throttle position sensor is bad. Judging from your codes and flooding.. sensor may have shorted to WOT. Don't know if it will work, but you can try unplugging it see if it will start if not for a breif second or so. Or you can check to make sure its even plugged in heh. Either way, if its plugged in and bad, your gonna need a whole new throttle body, the sensor is part of the throttle body. Think its like 150-175 for a remanufactured at the dealer.
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Modifications/Upgrades:
Magnaflow Catback, RevAuto Torque Dampner and Mobil 1 Full Synthetic, Painted Engine Cover
Sounds like your Throttle position sensor is bad. Judging from your codes and flooding.. sensor may have shorted to WOT. Don't know if it will work, but you can try unplugging it see if it will start if not for a breif second or so. Or you can check to make sure its even plugged in heh. Either way, if its plugged in and bad, your gonna need a whole new throttle body, the sensor is part of the throttle body. Think its like 150-175 for a remanufactured at the dealer.
That is what I thought, so I replaced it and programmed it. Still no start and it keeps flooding. I checked fuel pressure and it reads 54. I checked the ecu and it "looked" ok. But I still think that the ecu needs to be reprogrammed. I checked the connectors at the injectors and they are pulsating. The thing is like I said before the damn thing keeps flooding itself. What do you think it could be???
So you changed out the entire throttle body assembly already and its still doing the same thing? Cam/Crank typically won't cause it to not to start, unless they're both dead.
Do you still happen to have your old throttle body? I know this sounds odd, but put it back on and see what happens. Its a shot in the dark, but we've had issues with the remanufactured throttle bodies not working properly and for some odd once we reinstall the old one it works fine. Dont ask me why it just a oddity.
If that doesn't work, I dunno. Hard to diagnose over the internet ya know. May have to take it to a dealer and get em to look at the data with our scanner. Unless you know someone with a MAC, Snap-On Quality Scanner that can do it.
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Modifications/Upgrades:
Magnaflow Catback, RevAuto Torque Dampner and Mobil 1 Full Synthetic, Painted Engine Cover
So you changed out the entire throttle body assembly already and its still doing the same thing? Cam/Crank typically won't cause it to not to start, unless they're both dead.
Do you still happen to have your old throttle body? I know this sounds odd, but put it back on and see what happens. Its a shot in the dark, but we've had issues with the remanufactured throttle bodies not working properly and for some odd once we reinstall the old one it works fine. Dont ask me why it just a oddity.
If that doesn't work, I dunno. Hard to diagnose over the internet ya know. May have to take it to a dealer and get em to look at the data with our scanner. Unless you know someone with a MAC, Snap-On Quality Scanner that can do it.
Ok but answer me this, what controls how much fuel is entered The computer or the throttle body??
its not 1 thing or another. Its a mix of things that determines how much fuel is added. You've got the MAF telling the computer how much air is supposed to be entering the engine and then telling it how much fuel should be added, engine temperature, whether its cold or at operating temp. It Will add more gas when its cold than when its at operating temp to heat up catalyst quicker. Throttle position, at what percent the the TP sensor is at. WOT, idling, cruising. And other things that vary from engine to engine.
All these things are sent to the ECM, for it to compute and act accordingly. Though sometimes if the ECM is somewhat messed up it will throw a code.
The throttle body itself has no control on fuel, it just meters air coming into the engine. The throttle position sensor thats built into the throttle body has an effect on fuel though.
__________________
Modifications/Upgrades:
Magnaflow Catback, RevAuto Torque Dampner and Mobil 1 Full Synthetic, Painted Engine Cover
I'm assuming it ran fine before you tore it apart aside from overheating. Go back and see what you didnt get right. If the cam timing is off every bit of fuel injected will fail to ignite and essentially flood the motor.
Don't think that something mysteriously stopped working after you do major work, go back and check your work. Pull the vacuum line off the pressure regulator and crank, if you have fuel coming out the vacuum tap it's no good. Check all your sensor connections, you may have some transposed, I don't know of this is possible with Nissan as I haven't messed with mine yet.
Hey man I have the same problem and havent figured it out yet. But if you press the gas pedal down about a half inch or an inch during cranking it may fire right up and run just fine. Thats what mine does. I've gotten really good at starting it with the problem. There is a sweet spot. I havent had the money to get the problem diagnosed yet so thats what ive figured out with it so far. Ive replaced: starter with ECM reprogram, o2 sensor, throttle body, and even the fuel pressure reg. assm., still no luck on fixing the problem. All those parts have service bullitins.
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