Low oil pressure at Vtec port (no Vtec)
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Low oil pressure at Vtec port (no Vtec)
hello ya'll!
Since rebuilding my JDM DB8 I have a problem with my Vtec not engaging..
First I checked all electronical bits.. (I have no Vtec oil pressure switch)
-the ECU is giving de 12v signal to the solenoid at 5500rpm
-the solenoid clicks when I apply 12v to it
-solenoid gives 17+ ohm at 1pin connector
- No CEL codes
So today I decided to check the oil pressure at the vtec port left on the head and on the block at the oil pressure sensor.
At the block I got a nice 20psi at idle and 70psi at high rpm.
At the Vtec port I only got 20psi at 5500rpm.. I used both methods; first applied 12v from battery to solenoids 1pin connector.
Also had the car on jack stands in gear at rpm to make sure solenoid is getting 12v.
So the question is; What are the possible causes for the low oil pressure when vtec is supposed to engage?
Thanks
Since rebuilding my JDM DB8 I have a problem with my Vtec not engaging..
First I checked all electronical bits.. (I have no Vtec oil pressure switch)
-the ECU is giving de 12v signal to the solenoid at 5500rpm
-the solenoid clicks when I apply 12v to it
-solenoid gives 17+ ohm at 1pin connector
- No CEL codes
So today I decided to check the oil pressure at the vtec port left on the head and on the block at the oil pressure sensor.
At the block I got a nice 20psi at idle and 70psi at high rpm.
At the Vtec port I only got 20psi at 5500rpm.. I used both methods; first applied 12v from battery to solenoids 1pin connector.
Also had the car on jack stands in gear at rpm to make sure solenoid is getting 12v.
So the question is; What are the possible causes for the low oil pressure when vtec is supposed to engage?
Thanks
#2
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Re: Low oil pressure at Vtec port (no Vtec)
Did you take apart the head?There are these little o-rings under the cam caps that sometimes are forgotten.Atleast in my motor there are I am not 100% sure if you have them but check.They cause oiling issues.The solenoid also has a small screen that needs to be checked it can become clogged.I am guessing this may not be the problem but you might as well check to make sure.
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Re: Low oil pressure at Vtec port (no Vtec)
Did you take apart the head?There are these little o-rings under the cam caps that sometimes are forgotten.Atleast in my motor there are I am not 100% sure if you have them but check.They cause oiling issues.The solenoid also has a small screen that needs to be checked it can become clogged.I am guessing this may not be the problem but you might as well check to make sure.
The screen and solenoid gasket are brand new.
Thanks
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Re: Low oil pressure at Vtec port (no Vtec)
This is the O-ring underneath the nr.3 camcap, of which there is only one
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Re: Low oil pressure at Vtec port (no Vtec)
Check in this thread maybe something in here will help?
https://honda-tech.com/all-motor-nat...-port-2486207/
https://honda-tech.com/all-motor-nat...-port-2486207/
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Re: Low oil pressure at Vtec port (no Vtec)
Thanks, but unfortunately that thread doesn't come up with a solution, like all treads about vtec oil pressure problems..
I was thinking.. Could it be because of a bad oilpump? It does give proper pressure at the block but maybe its a little worn and cant get the pressure to the head anymore.. Just guessing here.
I was thinking.. Could it be because of a bad oilpump? It does give proper pressure at the block but maybe its a little worn and cant get the pressure to the head anymore.. Just guessing here.
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Re: Low oil pressure at Vtec port (no Vtec)
Will do the air-pressure test up next.. If all seems to work ok I'm just gonna start replacing s**t! starting with the solenoid
Thanks for the input guys
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Re: Low oil pressure at Vtec port (no Vtec)
So I may have found the problem!
Today I did the Vtec airpressure test.. put something like 70Psi of pressure on the check port. huge leak between the first rockers!..
Video: (not blocking the little hole here cause oil would have been hitting my phone if I would, but it shows the leak)
Vtec piston stuck or worn?
Today I did the Vtec airpressure test.. put something like 70Psi of pressure on the check port. huge leak between the first rockers!..
Video: (not blocking the little hole here cause oil would have been hitting my phone if I would, but it shows the leak)
Vtec piston stuck or worn?
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Re: Low oil pressure at Vtec port (no Vtec)
The piston of the Vtec rocker nearest to the solenoid was lying loose in the head!
I seriously F***d up when assembling the head..
Glad the little piston didnt do any damage tho!
Thanks for the help y'all!
I seriously F***d up when assembling the head..
Glad the little piston didnt do any damage tho!
Thanks for the help y'all!
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Re: Low oil pressure at Vtec port (no Vtec)
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