Question about 1990 Nissan 300ZX

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300zx leaking fuel injector

I recently installed 6 brand new fuel injectors on my 1993 300zx NA. One of them leaked. When I took the injector out the o ring was torn I replaced it and it happened again (same thing it was torn). What could I be doing wrong? Mind you after each time I installed the injector it did not leak immediately but started leaking after I test drove it.

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You need to lubricate the o ring prior to fitting the injector. Without the lubrication the injector does not slide into the fitting and can roll in the groove and get snagged and damaged. A thin film of engine oil will fix it but also check the sleeve where the injector sits in case it has a burr or was nicked during the removal process first time.

Posted on Sep 06, 2009

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My 1993 Geo tracker fuel systen is not working, the injector is not spraying. now it is sprayin on the inside of the carborator and filling the carborator up.. how do i fix this problem//


there is no CARB on this car.
that must be the throttle body engine, TBI EFI.
1 injector engine not the 4 MPI engine.
G16a is TBI G1b is TBI and both sold day 1 , new.
its is supposed to spray, but you forgot to say when.
just key on over and over not running, (not spray is correct)
it sprays cranking and running,, that be its job1.

lets say it sprays key one.
That means:
1: injector leaks.
2: injector - o-rings are bad. (cracked)
3: ECU injector drivers shorted (bad ECU)
you can look at the inject on this car, air pipe off TBI horn.
see if the seals leak or injector tip leaks ?
if the injector actually leaks.
unplug the injector connector (4pin plug)
leak now.
yes, injector is bad or just o-rings
no, the ECU is bad. (common on this car)
i can even tell you which transistors are bad.... etc.....ask.

both engines covered here.
http://www.fixkick.com/INJECTORS/injectors.html

Dec 09, 2015 | 1993 Geo Tracker

2 Answers

Po 306 engine missfire on no 6


If all you say is correct, then smoke test the intake
& you should have a vacuum leak next to #6

Next do a cylinder leak down, verse a compression test

Always do leak down,don't care about compression until
you fail the leak down

Feb 08, 2013 | 2001 Ford Ranger Regular Cab

1 Answer

How do I replace the fuel injectors in a 300zx


have a 1993 300ZX N/A and have had two injectors go out on me at different times. This is an expensive fix for two reasons; 1) the injector. 2) the installation process.

If you're lucky you can find a shop or eBay seller with new or reconditioned injectors at an affordable price. $150~$275/injector is steep. Worse is the cost of removal and installation since the upper plenum and fuel rails must be removed. This is a design flaw by Nissan since you can see both screws to remove the injectors, but one is partially covered by the aliminum upper plenum (big silver colored aluminum air intake over the block). There are some sites that will talk about drilling or filing the plenum to allow access to the second screw, but this is highly frowned upon and you run the risk of putting a hole in the plenum. Best to leave this as-is.

It's cost effective to replace these yourself if you're handy with a wrench and a screwdriver. the cost for a shop to do this job is between for one injector. Most of the cost is the labor to remove and replace the plenum and fuel rails.

If you want to do this yourself, start with using a voltmeter and check each injector to find the bad one. Set the voltmeter to Ohms, disconnect the electrical from the injectors, and check the resistance between the contacts of each injector. They should read between 10 and 18 Ohms. Here's how:
http://www.2carpros.com/how_to/how_to_check_fuel_injector.htm

Here's a step by step process for replacement:
http://wiki.answers.com/Q/How_do_you_install_fuel_injectors_in_Nissan_300_ZX

Like I said, I paid for this twice and never again. Too much money for such a small part that I can do myself in my spare time.

Sep 11, 2012 | 1991 Nissan 300ZX

1 Answer

I have fuel leaking from the fuel rail at the 2nd injector from the front. The leak seems to be coming from where the metal of the fuel rail conects to the plastic....


Maybe an O-ring is leaking. Try a new injector that comes with an o-ring to be sure it's not the injector itself.
Fuel Injector - for V8

REMOVAL & INSTALLATION


  1. Before servicing the vehicle, refer to the precautions in the beginning of
    this section.
  2. Relieve fuel system pressure.
  3. Remove or disconnect the following:

    • Negative battery cable
    • Fuel rail
    • Fuel injector retaining clips
    • Fuel injectors

    To install:

  4. Install or connect the following:

    • Fuel injectors, using new O-rings
    • Fuel injector clips to the fuel rail
    • Fuel rail
    • Negative battery cable

  5. Start the vehicle and check for leaks, repair if necessary.

Oct 30, 2010 | 2002 Jeep Grand Cherokee

1 Answer

My Audi 500 SEL 1993 model is difficult to start - as if there is not enough fuel injected when the engine is cranked. Agents tell me that the injectors are leaking and needs replacement. I don't agree...


bad fuel, bad fuel pump, clogged fuel fiter, injectors or fuel fiter. If injectors are leaking at o-rings on rail or cylinder head your sucking in air and changing mixture ratio, computer can't compensate. Try all these things before proceding further... also when cold thew seals may be holding but when warmed up this is can be a very dangerous fire condition!

Sep 16, 2010 | 1993 Audi 100

1 Answer

How do i install fuel injectors on a 1993


Your problem doesn't make sense to me , but I can almost guarantee you that replacing your injectors won't cure it. I am sitting here trying to figure out how fuel could be getting into your oil and not coming up with an answer. A blown intake manifold gasket , or head gasket would do it , but would cause other very noticeable problems

Apr 08, 2010 | 1997 Infiniti.5 Q45

1 Answer

How much is it to change a fuel injector if its one or all 6 on the non turbo 1991 nissan 300zx V6 ?


Oh this is fun...

I have a 1993 300ZX N/A and have had two injectors go out on me at different times. This is an expensive fix for two reasons; 1) the injector. 2) the installation process.

If you're lucky you can find a shop or eBay seller with new or reconditioned injectors at an affordable price. $150~$275/injector is steep. Worse is the cost of removal and installation since the upper plenum and fuel rails must be removed. This is a design flaw by Nissan since you can see both screws to remove the injectors, but one is partially covered by the aliminum upper plenum (big silver colored aluminum air intake over the block). There are some sites that will talk about drilling or filing the plenum to allow access to the second screw, but this is highly frowned upon and you run the risk of putting a hole in the plenum. Best to leave this as-is.

It's cost effective to replace these yourself if you're handy with a wrench and a screwdriver. the cost for a shop to do this job is between $600 and $1000 for one injector. Most of the cost is the labor to remove and replace the plenum and fuel rails.

If you want to do this yourself, start with using a voltmeter and check each injector to find the bad one. Set the voltmeter to Ohms, disconnect the electrical from the injectors, and check the resistance between the contacts of each injector. They should read between 10 and 18 Ohms. Here's how:
http://www.2carpros.com/how_to/how_to_check_fuel_injector.htm

Here's a step by step process for replacement:
http://wiki.answers.com/Q/How_do_you_install_fuel_injectors_in_Nissan_300_ZX

Like I said, I paid for this twice and never again. Too much money for such a small part that I can do myself in my spare time.

Hope this helps!

Feb 20, 2010 | 1991 Nissan 300ZX

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