2004 V35, Oil light on under braking

[Lachlan S]

2004 V35, Oil light on under braking

Hey guys,

 

I just noticed this today, but under somewhat hard braking, my oil light came on. Now I checked the oil before and it seems full, and it was full about a week ago (will check again on cold engine tomorrow morning).

 

The oil light only very briefly comes on, and goes away when stationary, it never comes on under accelerating, holding speed or normal braking, only hard braking, and if i hit the clutch when I do. 

 

The car is very low km (53000), and had all fluids changed at 52000kms, so I don't think it could be low.

 

Any ideas?

 

Thanks

 

p.s. car is 04 V35 non rev up VQ35DE

[Lachlan S]

might want to add, it only seemed to happen under heavy braking and depressing the clutch pedal

[ka86]

If it's not happening when accelerating dare say that you're building enough oil pressure which goes when braking.

I'd say oil pump and or oil sender unit.

[Lachlan S]

5 minutes ago, ka86 said:

If it's not happening when accelerating dare say that you're building enough oil pressure which goes when braking.

I'd say oil pump and or oil sender unit.

Would that happen on such a low km engine, and it only happens for a second after I put my foot on the clutch while braking.

[ka86]

It can happen on a brand new engine. Unfortunately mass production can have some parts fail however haven't heard of these failing often.

If you're 100% sure your oil level is correct I would look at the sender (including wiring) and pump as a start.  

On a separate note when you imported it, were the Kms verified/checked thoroughly to condition etc?

 

[Lachlan S]

16 minutes ago, ka86 said:

It can happen on a brand new engine. Unfortunately mass production can have some parts fail however haven't heard of these failing often.

If you're 100% sure your oil level is correct I would look at the sender (including wiring) and pump as a start.  

On a separate note when you imported it, were the Kms verified/checked thoroughly to condition etc?

 

Yep, full dereg and genuine kms, not worn out like a high km car, I'm going to drive it down to my mechanic tomorrow to see if he can mechanically check the pressure, its only a short drive and the car isn't making noises nor is it low on oil so should be ok i think. I'm leaning toward thinking its the sensor. 

[steventt]

The engine idle is dropping too low to activate the oil pressure sensor circuit and keep the light off. What is causing this low idle at deceleration/no load? Any solid or intermittent checklight Secondary O2 sensor bad? Tps/thottle body good/needs cleaning? Vqs are throttle by wire right? Coilpack failing/misfiring? What does the idle drop to? Seeing that you went through the trouble of changing all the fluids do you mind getting a new crank sensor and using the original as a spare? Oil light=car on engine not running/oil light wire short/engine idle too low(see above questions)/clogged oil strainer/very old oil/faulty or ailing oil pump(ailing and dead are the same it wont gush oil on the cams due to not enough oil pressure). If either O2 sensor is bad/very very dirty the ecu will compensate fueling and timing on deceleration wrong it would run rich and pull timing. If the throttle body or idle valve is "sick" it wont give correct air compensation on deceration. Coilpacks love to give trouble off load and idle. If ur crank sensor is on its way out on deceleration it would pick up wrong and bog. When you depress the brake and clutch pedal, individual signals go to the ecu to help with transient compensation, load to off load, off load to load etc. Hope this makes sense and helps to understand how various problems occur.

[sonicii]

I Would agree with the others, possibly rpm dropping too low, or it could be a sender issue, if you can confirm the RPM isn't dropping below 650rpm when you press the clutch, then perhaps have the mechanic fit a pressure gauge and take it for a drive to check oil pressure figures.