VTEC Issues

[Fallenangel]

I've done a little more diagnosing

No ECU codes came up when i checked it last night.

Oil Pressure is as follows at WOT

2500rpm - 75psi
3000rpm - 80psi-85psi
4500rpm - 85psi-90psi
6000rpm - 90-100psi (vtec not engaged)
Didn't go any higher than that.

I've also attached pictures of the engine bay on the first post if that helps

[tinkerbell]

I've done a little more diagnosing

No ECU codes came up when i checked it last night.

Oil Pressure is as follows at WOT

2500rpm - 75psi
3000rpm - 80psi-85psi
4500rpm - 85psi-90psi
6000rpm - 90-100psi (vtec not engaged)
Didn't go any higher than that.

I've also attached pictures of the engine bay on the first post if that helps

it should not be raising that high, particularity after ~3000rpm...

too high pressure is bad.

you need to work out whether it is the location of the sensor that is giving bad readings, but you might have a problem with your oil pump...

or a problem with your oil cooler system, or your oil cooler relocation setup, or somewhere else there is a blockage in your oil path, which is making the pressure too high (and thus the 'flow' too low)

changing to thicker oil might help this, but it might not if you have a blockage somewhere...

[tinkerbell]

you also need to fix your sump as it sounds like it has been hit.

[tinkerbell]

Oil Temp/Pressure sensor is in the sandwich plate and the back of the block

the questions was more 'what part of the oil circuit does the sensor measure'

i.e. is it on the outlet or the return side?

[ChargeR]

the questions was more 'what part of the oil circuit does the sensor measure'

i.e. is it on the outlet or the return side?

it should not be raising that high, particularity after ~3000rpm...

too high pressure is bad.

you need to work out whether it is the location of the sensor that is giving bad readings, but you might have a problem with your oil pump...

or a problem with your oil cooler system, or your oil cooler relocation setup, or somewhere else there is a blockage in your oil path, which is making the pressure too high (and thus the 'flow' too low)

changing to thicker oil might help this, but it might not if you have a blockage somewhere...

Tinkerbell echoes my thoughts, that's where I was leading with my query on the pressure sensor location. That pressure seemed too high from what I have read, Karl's numbers seem normal. Something could be up with your oil system downstream of the pressure sensor as tinkerbell says.

[Karl]

Tinkerbell echoes my thoughts, that's where I was leading with my query on the pressure sensor location. That pressure seemed too high from what I have read, Karl's numbers seem normal. Something could be up with your oil system downstream of the pressure sensor as tinkerbell says.

yer mine must have a pressure limiter valve or something to that affect. As it hits 80-85 psi and the needle seats there through the hole rev range above around 3000-4000 rpm. And my gauge is fine as it sweeps through the hole range when turned on and off!


This may be stuck closed. hence the pressure continues to build

[tinkerbell]

looking at the pics - it looks like the pressure sensor is on the relocator plate, not the back of the block??

[Fallenangel]

you also need to fix your sump as it sounds like it has been hit.

I'll buy a new sump over the weekend. Any other suggestions to replace at the same time?

the questions was more 'what part of the oil circuit does the sensor measure'

i.e. is it on the outlet or the return side?

Tinkerbell echoes my thoughts, that's where I was leading with my query on the pressure sensor location. That pressure seemed too high from what I have read, Karl's numbers seem normal. Something could be up with your oil system downstream of the pressure sensor as tinkerbell says.

I'll have to get back to you on that one, i'm can't remember which side i've put it on. I'll have a look tonight and report back. Ideally, which side should it be placed?

[Fallenangel]

looking at the pics - it looks like the pressure sensor is on the relocator plate, not the back of the block??

That sensor isn't connected up to anything at the moment. I just haven't bothered to take it out and plug it up. Would that cause an issue?

[Fallenangel]

yer mine must have a pressure limiter valve or something to that affect. As it hits 80-85 psi and the needle seats there through the hole rev range above around 3000-4000 rpm. And my gauge is fine as it sweeps through the hole range when turned on and off!
This may be stuck closed. hence the pressure continues to build

Is there a way to test my gauge to see its working properly? It seems to rise and fall at the right places but i'm not too sure that its accurate to be honest

[Karl]

For oil pan . Moroso 20911 is what im running. But if you want i also have a genuine one for sale in good nick!

For testing. Disconnect the stock oil pressure sensor next to the oil filter " stock oil filter location". And connect a mechanical gauge!

[tinkerbell]

yer mine must have a pressure limiter valve or something to that affect.

everyone has it - it is the 'pressure relief valve' that prevents the oil pressure continuing to rise after it is as high as it needs to be (around 80 psi) - but not really sure how to test/rule-out this as the problem,

and the problem we are diagnosing is the VTEC cutting out when teh oil is hot...

so as the oil thins out when it gets hotter, the VTEC does not engage properly.

it could be the sump as only a few MM of difference could make the oil harder to suck up into the oil pickup?

[Karl]

everyone has it - it is the 'pressure relief valve' that prevents the oil pressure continuing to rise after it is as high as it needs to be (around 80 psi) - but not really sure how to test/rule-out this as the problem,

and the problem we are diagnosing is the VTEC cutting out when teh oil is hot...

so as the oil thins out when it gets hotter, the VTEC does not engage properly.

it could be the sump as only a few MM of difference could make the oil harder to suck up into the oil pickup?

I wasn't referring mine is different. As for testing, disconnect the stock pressure sensor. Install a mechanic gauge and see if it raises higher then the cut off point. Give or take 10%




Id start by disconnection the oil cooler and oil filter relocation.
Install the oil filter in the correct spot and test drive car!

The interesting thing is adding all that stuff would have created oil pressure loss!. So either your gauge is stuffed, pressure relief valve is stuffed, block on a line or oil cooler.

You may have to much of a pressure loss that's creating the problem and the gauge is reading wrong!

[Fallenangel]

The weird thing is, this setup has been on the car for about a year now. No problems before, even at the track. All just happened all of a sudden.

[tinkerbell]

maybe you broke something at the track because you were running low oil, and now all the metal particles are clogging up your oil system?

(worst case scenario)

maybe you need to detail more of what happened at the track???