Stop Light At High Revs

[skinner2k3 3]

Hi

 

I had the stop light come on last night whilst at high revs (Approx 6500 to 7000), whilst testing the limiter was functioning. Gauges looked fine, good oil pressure etc.

 

A search confirmed only low oil pressure or high coolant temp should cause it. As said, oil pressure was good, coolant normal.

 

The stop light was not accompanied by either the oil pressure gauge light or the coolant gauge light, as some searches suggested was the norm.

 

Oil is new, 10w40 semi synth, not low. Coolant level is on the red filler insert.

 

What next?

[pug_ham 245 3 Cars]

Is the sender a known good one?

 

If you can I'd swap the stop sender or check the wiring.

 

g

[skinner2k3 3]

I do have others I could try. I suppose I could also disconnect it, tape it up and rev the car again. See if the light stays off.

 

My main concern was the pressure gauge not dropping, sure it didnt but will keep an eye on that next time to double check.

[kyepan 291]

could there be any mechanical reason why the pressure would drop as the speed of the engine and pump increases?

[Anthony 1,003]

The stop light was not accompanied by either the oil pressure gauge light or the coolant gauge light, as some searches suggested was the norm.

Do all three lights - STOP, oil pressure, coolant temp - come on correctly with the ignition (but engine off) thus confirming the bulbs are OK?

 

Did the STOP light come on suddenly and at full brightness, or did it sort of slowly and dimly illuminate? Did it go out as soon as you came off the loud pedal and the revs dropped?

 

Certainly I'm not aware of a circumstance where the STOP light comes on alone on a 205 - the only two conditions that I'm aware of are:

 

• Low oil pressure = STOP, low oil pressure, high coolant temp warning lights all lit.
  
• High coolant temp = STOP and high coolant temp warning lights lit.

That said, I vaguely recall reading of a couple of instances where the dash cluster has a fault and allows backfeed from another circuit to falsely illuminate warning lights, although that would still suggest that something would have had to act as a trigger, and the only thing I've generally heard of / experienced at high revs/load is the Phase 2 low coolant light getting falsely triggered - but that doesn't and shouldn't illuminate the STOP light.

[skinner2k3 3]

Do all three lights - STOP, oil pressure, coolant temp - come on correctly with the ignition (but engine off) thus confirming the bulbs are OK? - I will check, cant say I paid much attention!

 

Did the STOP light come on suddenly and at full brightness, or did it sort of slowly and dimly illuminate? Did it go out as soon as you came off the loud pedal and the revs dropped? - Straight on full brightness, once revs dropped back below about 6k it went out.

 

Thanks guys gives me a few things to look for.

[skinner2k3 3]

OK, just checked lights with ignition on and the warning light on both gauges work. But, having sat there staring at the lights I think maybe it was the pair below for the brakes that came on

 

Checked the oil (full) coolant (inside the red filler insert) and brake fluid......which was on the low markers! I think under acceleration the fluid may have swished to the back of the reservoir!

Edited September 8, 2011 by skinner2k3