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Thanks to everyone who replied. Mysteriously the miss is gone and the
car runs good now. No idea what caused it. Friday it was fine, Sat &
Sun had a miss, Monday was fine. I imagine some moisture might have
been somewhere it wasn't supposed to be and when it dried out, it was
fine. I am going to throw a new cap, rotor, plugs, wires and fuel
filter just as preventative maintenance since I have no idea how old
they are. Thanks again to all who replied.

Derek

Bill G wrote:
> > wrote in message
> oups.com...
> > Hey everyone,
> >
> > First of all, sorry for the cross posting but I believe it's relevant
> > in all groups posted to. I have a 91 nissan maxima GXE with 190k, V6,
> > 5sp. This car has driven great until 2 days ago. All of a sudden
> > (literally overnight)it developed a miss that is noticeable throughout
> > the entire RPM range. Car ran great Friday and then Saturday when I
> > started it, the miss was noticeable. The idle is down to about 600 vs
> > 800 it was before and power is down. I checked the plugs, wires, cap
> > and rotor and they all look good. They are about 2 years old with
> > roughly 15k on them. The miss seems worse when the engine is cold. I
> > can't see any wires arcing and have verified that there is spark at
> > every wire using a timing light. The check engine light is not lit.
> > The car shakes mildly at idle and has kind of a pfft pfft sound at the
> > exhaust pipe. Anyone have any ideas on what else to check? I am at a
> > loss and need to get her running right again asap.
>
> How old is the fuel filter? Replace it if it's old. Since you have spark
> at each plug, the other necessities are fuel and air. Check the air filter,
> and then check the injectors.
>
> You can use a piece of rubber hose to listen to each cylinder as the engine
> runs, and each injector should make a "pfft pfft" sound. Another test is to
> unplug each injector (engine off) and put an ohm meter across the two leads.
> I don't know what it should read, but they should all be the same. If one
> is wildly different, it's probably bad. But, you should have a Check Engine
> light if one of the injectors has failed. You could also unplug each
> injector and see if the car's performance changes. If one is bad, and you
> pull another cable, you'll probably stall the car.
>
>
> Bill G
> '91 SE Auto
>
>
> >
> > Thanks in advance
> >
> > Derek
> >