1991 nissan sentra - whats my next step...

- R
- Robbie Wilson
  
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posted
15 years ago

Fri, Feb 27, 2009 12:42 AM

i have 220k miles on the clock, and finally have an issue- not getting any power from cylinder 3. at first i guessed no fire and replaced plugs, wires, rotors, and distributor. no love for cylinder 3. then i made sure the compression was ok - got 160psi on compression guage. the injector is making the injector noise like the other three when running, so my question remains- what should i check next? is there a chance of a stuck closed intake valve? if i take the valve cover off what kind of checking can i do? THANKS guys, i know i will get great answers from the group.

- K
- Kenny
  
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posted
15 years ago

Fri, Feb 27, 2009 3:07 AM

If it's not spark and not compression it has to be fuel.

Just because the injector is making "injector noise" does not mean its spraying fuel.

- C
- codifus
  
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posted
15 years ago

Fri, Feb 27, 2009 3:18 AM

- K
- Kenny
  
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posted
15 years ago

Sat, Feb 28, 2009 2:56 AM

First thing is to make sure the ECM is commanding the injector to fire, to check this you want to use something that will indicate the injector is getting power and a ground signal from the ECM , there is a tool called a noid light that will flash to indicate the command signal is being sent.

Chances are the ECM is giving that command, another way is to get a DOVM (digital Volt/Ohm Meter) and check the coil circuit of the injector. do this by unplugging the injector connector and touching the leads of the meter to the terminals of the injector, the reading should be about 10-15 Ohms, anything more is a problem

Good suggestion....and a good test? Switch injectors around and see if the problem moves with the injector.

CD