Re: Nissan Maxima V6 intermitant engine fault


"AJH" <sylva@xxxxxxxxxxxxx> wrote in message
news:n5var11feo349e5t1vdrgr3j1ef367qi8i@xxxxxxxxxx
>
> I received this 1994 car from a friend, it is an automatic, and
> everything works but it has developed a problem. At first it was just
> uneven idling with jerks and hesitancy as it warmed up followed by
> intermittent jerking when hot. A local garage checked the flash codes
> and there is nothing showing up. I was fairly certain it was all
> cylinders or one bank failing for a few revs but changed the ignition
> leads, distributor cap and rotor arm just in case.
>
> The problem is still there and in this cold weather the car
> occasionally stalls when pulling up to junctions after a 2nd cold
> start. This is a bit awkward with an auto as you lose steering and
> brake power assist with no overrun to help out, so my daughter who is
> the main driver is wary or using it..
>
> I just need an idea as to what else to check. The fact that it starts
> and runs faultlessly for the first start each day may be significant.
> The problem always seems worse after a warm or second start. This
> makes me wonder if there is a fault either in a temperature sensor or
> its wiring to the ECU, except I don't know where to look as the only
> manual or diagrams I have is from a 2000 model.
>
> Also the engine runs cool on the temp sensor and the heating is poor,
> yet under bonnet everything seems hot enough. I wonder if a faulty
> thermostat could fool the ecu?
>

Your first problem sounds like either a faulty main relay jumping in and
out, OR a bad connection at, OR a faulty ignition amplifier (called an
Ignitor on jap cars) all of which would give you intermittent but violent
loss of power.

Does the rev counter plumet with the loss of power, or does it continue to
read the dying engine revs? If the former, then its definately loss of power
to the ECU or ignition primary problems.

Your low running temp is more than likely a lazy 'stat. Change it. Not
connected to the first problem-though you may find the engine running hotter
will agrivate the spluttering. If so then i'd change the amplifer straight
away. Some freeze spray may help here to double check.

Tim..


.

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