Hello all,

This is my first post, please does any one have answer for my symptoms:

While stopped at signal lights only some times the motor RPM drops lower than the idling RPM and the oil light comes on. (Neon 01)

A slight touch on the gas pedal brings the RPM up and the light goes out.

This happens not at all light stops. When all is ok the idling RPM seems to be normal.

Oil level is at full and new filter in last week (she did this with the old filter also)



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Not leaking oil? If oil level is full and everything is good there I would take aim at the oil pressure sensor cause that is what is tripping the oil light off. Maybe replace it? I don't know how much they run, but it shouldn't be that hard to replace yourself.

 

Definately she is not leaking oil and oil level is full. Yes the oil pressure sensor is the first I am going to replace.

Shall update when done

 

The problem is the idle dropping not anything to do with the oil. Now why your idle is dropping I have no clue.

 

Something on the throttle boddy perhaps? But even if the idle drops a bit it shouldn't be enough to trigger the oil pressure sender. The dummy light is set to go off when the oil pressure is rediculuously low.

 

At a low enough RPM the engine is not spinning fast enough for the oil pump to make enough pressure and the the oil light will come on. Try pulling a spark plug wire or 2 while the car is running and watch the oil light come on as the RPMs drop.

 

1) Pulling spark plug wire did not help, the rpm dropped and vibration increased but no oil light.

2) Got a friend to connect his OBD II scanner and no codes active or present.

3) Found one sensor plug (The sensor above the oil switch) loose or almost out. Cold Idle rpm is much higher and reduces when the engine heats up.

4) To work at 6 am ambinet temp is low and fast commute no alarm. On way back at 3 pm ambinet day time temp (Vancouver) and lots of stop and
start at lights the oil light is back as before but the idle rpm seems not to drop as much.

5) Connected Radio shack batter/alternator tester all leds' upto 14.v led remais lit all time.

6) Have found tsb 18-017-01 REV.A Engine Idle Undersoot/Performance Repair Recommend to reprograme the PCM. All local delars have no appointment
avaliable till next week. (No upgrade Label in my vehicle for above)

 

I had the same problem last winter with mine, didn't feel like paying $90 (u.s.) to have it reflashed, took a shot at reseting the pcm, that solved it.

FYI: Reset PCM by disconnecting negative battery terminal for 15-30 minutes

 

Reset PCM same problem persists.
P1684 code present now- battery loss - normal shall go away after 50 strats
Read on some other forum its caused by the butterfly flap in the throtle body. you need to drill a very fine hole in the middle.

 

You should not need to drill a hole in the TB, and if you do, make sure you take it off the car and clean it well to be sure you don't get any metal chip in the intake.