I just replaced the fuel pump on my car..... but for some reason the damn thing still wont run right.....What are the correct ways to diagnosis the fuel system, fuel pressure regulator, or could this be a o2 sensor problem.. and is there a particular way to test the o2 sensor, besides buying a new one a putting it on. THanks

 

whats it doing

 

when i turn the car over it will idle a little eraticly, and when i press the gas the car doesnt jump in revs, it sounds like theirs a fuel problem, matt if i cant figure it out how much u want to come over and take a look at it?

 

the ecu is giving me a 13 engine temp sensor code........but someone on the other forums said it cant be that?????

 

no code just 55 for normnal...... now when it turns it just idles out even if i manually throddle it.........???? something is not letting it idle???

 

is your mafs plugged in?

 

yeah, all that wiring i just replaced, so the connections have been throughly checked.......

 

how about vac leaks. thats what it souns like it is

 

the only ones that matter are the ones after the throddle body, correct? If that's the case than I don't think there is any..

 

Ther is your problem right there. Nissans will NOT run very well...if at all with the Engine coolant Temp sensor not connected. check the connector, and make sure it is on tight. if it still throws code 13 then go get a new Engine coolant temp sensor (2 pin) from the dealer. make sure to tell them its for the ECU not for the guage cluster. the motor has 2 sensors, one small single pin fo rthe guage cluster, one 2 pin sensor with a clip liek a fuel injector. they will both be located right near the thermostat housing.

Scott