1991 nissan sentra - whats my next step...

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Robbie Wilson - 27 Feb 2009 00:42 GMT

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.

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Kenny - 27 Feb 2009 03:07 GMT

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.

You probably have a bad injector

>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
[quoted text clipped - 5 lines]
> kind of checking can i do?
> THANKS guys, i know i will get great answers from the group.

Reply to this Message

codifus - 27 Feb 2009 03:18 GMT

> If it's not spark and not compression it has to be fuel.
>
[quoted text clipped - 10 lines]
> > kind of checking can i do?
> > THANKS guys, i know i will get great answers from the group.

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

CD

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Kenny - 28 Feb 2009 02:56 GMT

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

On Feb 26, 10:07 pm, "Kenny" <The RedSoxS...@verizon.com> wrote:

> If it's not spark and not compression it has to be fuel.
>
[quoted text clipped - 17 lines]
> > kind of checking can i do?
> > THANKS guys, i know i will get great answers from the group.

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

CD

Reply to this Message