1999 Nissan Maxima Fuel injectors

DSALBERTSON

MEMBER
1999 NISSAN MAXIMA
6 CYL
2WD
AUTOMATIC
170,000 MILES

After parking her 1999 Nissan Maxima in the Garrage, my girlfriend attempted to start it the next morning without success. After determining it was getting spark to the plugs we turned to fuel system. We have replaced the fuel pump and the fuel filter the car still won't start. I have pulled the fuel injectors on the front row, nearest to the front of the car and it appears that there is too much fuel in the intake. I have noticed that there is a plastic ring at the end of one of the injectors missing, also I have put an injector pulse tester onto the the electrical connecters and get nothing. (The light does not light when turning over the engine) trhe test light shows a direct connect to one side9lights up) but the pulse light does not. What do I do Now? Thank you, Sam

Wednesday, March 3rd, 2010 AT 4:38 PM

1 Reply

ERNEST CLARK

MECHANIC
1,730 POSTS

Test your components before replacing parts. This'll save you time and money. And if there's a check engine light on, have your computer scanned before proceeding.

After you changed your pump and filter, I assume you have fuel pressure. (?)

fuel in your intake manifold, with no injector pulse means one/more of your injectors is leaking and/or your fuel pressure regulator is leaking.

You'll have to isolate this and replace as needed.

As for your "No pulse", first check your wiring/connectors to the injectors. If they check out, then check your crank/cam position sensors. (Reference voltage and signal voltage) If there's no reference voltage, check wiring/connectors. Replace as needed. If the wires/connectors check out fine, but no reference voltage, then your computer is shot. If there's a reference voltage, but no signal voltage, then the sensor is bad.

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Friday, March 5th, 2010 AT 8:16 AM