[Peugeot-L] Re: 87 505 STX - Stalling first thing in the morning, but battery voltage not lo

From: Paul Strickland <pstrickl_at_suffolk.lib.ny.us>
Date: 06/14/06


The Negative temperature coefficient sensor is on the right front of the engine, just below the the top radiator hose and thermostat. This is referenced as you stand in front of the car and face it, not from the drivers seat.

This NTC sensor is different than the ones in other cars as it has resistance to the housing or ground from both terminals As the temperature goes up, the resistance goes down. If you unplug this NTC temp. , you should see 4 flashes, with engine running.

The one on the back is just for the gage inside of the car to report the temperature to the driver.

You are lucky that you get over 14 volts while running. I just checked mine. If I turn on the blower and headlights, mine sinks down to 12.8 volts, just barely enough to keep the battery from discharge. Someday I have to find out what is wrong here. Probably bad connection from alternator to battery, or not heavy enough wire. But then it has been like this for years !

The problem I had with the 4 flashes was probably an intermittent ground, but for now it magically fixed itself. Before this I would do the same thing as you; turn off engine and restart an d the problem would be ok for a while.

alan5o5 wrote:

> I believe it is 4 flashes. When you say NC temp sensor, you are
> referring to the coolant temperature sensor, correct? This is the
> sensor that is located in that convenient place on the back of the
> engine, correct? (v6)
>
> -Alan
>
> --- In peugeot-L@yahoogroups.com, Paul Strickland <pstrickl@...> wrote:
> >
> > Alan,
> >
> > Interesting! How many flashes do you get when this happens ?
> >
> > I have had similar problems. I would get 4 flashes, indicating the NC
> > temp. sensor. Put on a new connector and the thing would still be
> > intermittent. When it would happen, the car would run like crap.
> >
> > Now for the last few weeks, the problem has gone away and the car runs
> > like new with 160K.
> >
> > I have measured 4 or 5 87 STX and they all have low voltage, never
> > going above 13.6 volts. Someone on the list here has stated that the
> > wiring from the alternator is inadequate. I have yet to go directly to
> > the alternator to measure the voltage. It is under the car.
> >
> > Paul
> > 87 STI 5 sp
> > 85 N9T 5 sp
> >
> > alan5o5 wrote: I am experiencing some initial stalling when I first
> > drive off in the
> > morning. Initially I chocked it up as low voltage output from the
> > alternator and/or a weak battery from A/C and high-watt H4 bulbs.
> >
> > I purchased a multimeter to experiment and found the following.
> >
> > In the morning before I start I will let the ABS system pump up. With
> > the battery showing about 12.50 volts, the ABS pump will drop it down
> > bellow 12 to approx 11.40 or less. With the multimeter still on I
> > crank it and watch the volts drop down to about 10 volts until started.
> >
> > When started it will immediately jump to about 13.40 to 13.65. When I
> > shift into drive and start to pull out it bumps up a little higher. It
> > tries to stall when I apply the brake after a few feet. As soon as I
> > felt a stall I glanced over at the multimeter and it was still showing
> > 13+ volts. Strange.
> >
> > Once I pull out on the road the voltage shoots up to about 14.30 to
> > 14.55. (This is without the A/C, fan blower, radio, lights, etc being
> > on) At times the detonation light will start to blink. I stop and turn
> > off the car and then start it back up. The detonation light will go
> > off and remain off. The voltage will also drop to below 14, and
> > remains in the 13.30+ range.
> >
> > One other thing worth mentioning is the electric fan will come on when
> > the ignition is turned on, even though the ECO button is engaged and
> > the A/C off. When this happened yesterday afternoon, the A/C CPU relay
> > buzzed for a second. (The old ECU relay burned out, this unit is a new
> > one) This morning it occurred again (minus the ECU relay buzz), and I
> > was able to turn off the electric fan off by engaging the A/C, and
> > then turning it off.
> >
> > So could this be a grounding issue?
> >
> > Is the alternator pumping out too much power?
> >
> > Could the battery be bad? (Less than 9 months old)
> >
> > I'm rather stumped..
> >
> > -Alan
> >

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