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2004 V6 Oil pressure warning only on rough ground

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oil pressure warning indicator
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18K views 46 replies 4 participants last post by  Ckeeler1  
M
#1 ·
My 2004 V6 is showing an oil pressure warning only when I drive over rough ground.

Just changed oil, hoping to see an end of the warning, alas it was back as I encountered the savage potholes (more like moguls) in a driveway.

Any possible suggestions?

PS the warning to stop the vehicle flashes only for a moment, blink and you miss it, but the oil can stays for a little longer, them goes.

Thanks.
 
T
#6 ·
But oil pressure can be tricky. I've had a real oil pressure on my other car (Audi) and it was the PCV gone bad.
The stop warning engine came on when I decelerate. Here is how you test it: get on a road in good condition, go over to 80-90 km/h then apply the brakes. You don't need to apply the brakes like an emergency stop, just going from 90 to 40 for example. I was able to reproduce my issue this way and it ended up being the PCV.
For the V6 3.2 Treg the pcv 022103765A => 110€. You can buy a knockoff to test. It's easy to replace.
It might not be your issue but it would be worth investigating in case the sender/wiring solution does not yield good results.

https://fr.aliexpress.com/item/PCV-...87e4db411410-0&algo_pvid=cf445779-222f-431c-ac87-87e4db411410&priceBeautifyAB=0
 
M
#7 ·
Thank you for the great responses.

I have had a chance to wiggle most connectors. Still getting error.

But I have noticed a new issue and an observation.

The warning light seems to come on when I head downhill, maybe not always bumpy road, and this sounds more like ?? (oil pickup? PCV?) I have not been able to replicate the error when doing 90-40 klms but there is a sense that it's more likely to occur when you take your foot off the accelerator (ie when the car starts down a hill)

The new issue had occurred before but was only once or twice, this was the car when in "P" with the engine running starts to rev up to around 1500 RPM then down again, the back up to 1500...

Paul
 
T
#22 ·
mountainreg2 said:
Thanks, TRespect Really great, looks like I'm a 3.2, that was the only one sold in Australia, it looks like diaphragm should fit?



Paul
Click to expand...


On the 3.2 you cannot change the diaghragm part only. You can find a compatible upper part assembly but my advice is to stay oem and get the whole pcv unit at about 120/130€.


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M
#20 ·
Thanks, TRespect Really great, looks like I'm a 3.2, that was the only one sold in Australia, it looks like diaphragm should fit?

(I seemed to have posted this to the wrong thread.)

In the meantime, yes, PCV diaphragm has a tear, but I'd say I'm up for the whole unit as the plastic was very brittle and one of the lugs broke and the host snapped. Or I'm really clumsy.

Paul
 
M
#23 ·
Sorry can't send PM's yet, here's the late reply,


Before I had a chance to photo I put it back together with some silicone, been waiting for the silicone to dry, before installing.

Probably won't work, but I will test tomorrow. When I opened it up the diaphragm was only torn on the outer edge, it was very small, maybe 2 cm's centre = no problem.

After handling it broke some more, so we will see. I have ordered a replacement. but I may need the car for an emergency.

I didn't notice any strange sounds. but I did notice that there was air blowing out when the car was idling.

Paul

TRespect said:
Hi,

Can you please post or send me pics of the torn diaphragm?
I need to compare and see if it looks like the one I have, especially at the center.
Thanks.




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Click to expand...
 
T
#24 ·
Punctured or torn pcv diaphragm = problem :) whenever you're breaking/releasing the throttle you need the diaphragm to be drawn down by the intake vacuum and thus close or balance flow from engine to intake. If it is torn it won't perform the job and too much engine pressure is released/sucked through the pcv to the intake. You can get away with a torn diaphragm when the engine is on load only I guess. At least that's what I understood from my digging about the subject.
Be careful as the pressure can blow the silicone. Add some zip ties if you have any to hold the top part to the bottom part. And also be careful not to add any silicone inside the pcv as it will be swallowed by the intake and this can cause major issues. Better wait for the replacement.


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T
#27 ·
Yes. That's another valid cause if you don't do oil services or if you don't use the right oil and filter. A faulty oil pump can cause this too.
On my audi I was using castrol and doing oil changes every 10k km since i bought new so I rejected this oil screen clogged idea and looked for other causes till I found the pcv.
On a second high mileage car I would have checked the oil screen too.
But let's hope it is just the pcv especially that Paul found a punctured/torn diaphragm.


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