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DESPRET Oil Pressure and Vtec question

 
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Old 04-04-2009, 11:09 PM
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DESPRET Oil Pressure and Vtec question

I want to start by apologizing for another vtec thread, i know there are lots out there and i am sure i have read most of them but still cant solve my problem. please help me get my vtec back!

So my problem is that my vtec does not kick in.
stopped working out of no where

diagnosis:

After rebuilding the vtec solenoid, cleaning it out making sure all is ok and cleaning the gasket/screen my vtec still did not work.

i went out and bought a new solenoid off a friend that i know works, cleaned it, installed it and still does not work.

i then wanted to check continuity and the ohms on the resistance, now i admit i am still new at this and using a multimeter but i think i did it correct. but on my new vtec solenoid installed, i checked the resistance to the solenoid itself and it meassures 15.8 (within the specs range of 14-30) so the solenoid is good, i double checked the solenoid is good by connecting it to the battery and it clicks.

I then proceeded to check for continuity on the wire that is part of the wiring harness that leads to the vtec solenoid switch and as suspected there was none because the motor was off and im pretty sure my car has to be above 5500 for my vtec to actually engage.

next i checked for continuity to the vtec oil pressure switch and did not get anything, the car was running but in idle so im not sure if this is correct.

the resistance of the vtec pressure switch (green switch) itself measured to be about (00.6 ohms), once again not sure what it is suppose to be.

most recently i just went for a drive and tried to rig up my own test to see if it is getting continity to the vtec solenoid switch. so what i did was unplugged the solenoid switch (gray) and from the wireing harness i plugged in a continuity tester (test light) and went for a drive to see if it lights up when in vtec range. (yes it has full oil and yes the screen is clean.) but the light did not light up indicating the switch is infact not being activated form the ecm.

now sorry for rambling on but i wanted to give all the info i could.
the last thing i can think of is that my oil pressure is bad. i dont know how it would be because i have no leaks (rebuilt head and replaced all seals ps vtec worked fine for about 5000km after), so my question is how do i check the oil pressure? also where would i hook up a oil pressure gauge? lastly any other suggestions why my vtec doesnt engage?

thank you anyone who sat through and read this all and reply's.
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Old 04-05-2009, 10:26 AM
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Re: DESPRET Oil Pressure and Vtec question

could it be a fuse? lmao
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Old 04-05-2009, 11:03 AM
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Re: DESPRET Oil Pressure and Vtec question

vtec doesn't have a fuse. And you cant check continuity/ohms is the circuit is completed. As in....power and ground need to be removed from the component. (isolate the component from the circuit)

What year is the car?
What motor is in it?
Was it a swap?
Did they have to wire vtec pressure switch, and/or solenoid from the ECU to the engine?
Do you have any check engine lights?
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Old 04-05-2009, 11:46 AM
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Re: DESPRET Oil Pressure and Vtec question

the car is a 1997 prelude, base model, standard, h22a4 stock motor, i had a check engine light once when on the highway in vtec range, the light came on and my car shut off while driving. i got it read at honda and they said it was the vtec solenoid, code 22 i believe. since i have put the 'new' solenoid in i have not been able to trip the code again.
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Old 04-05-2009, 11:53 AM
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Re: DESPRET Oil Pressure and Vtec question

okay dumb question... is your oil a little low.... ????
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Old 04-05-2009, 11:59 AM
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Re: DESPRET Oil Pressure and Vtec question

its not that dumb of a question, i always see people thinking something major is wrong and it turns out to be there oil, but no it is not low at all.
how can i check the oil pressure? also i have a oil pressure gauge, where do i hook it up? how can i determine if my vtec oil pressure sensor is the source of the problem ( i doubt this because i have tried two sensors)?
lastly, does it make sense to have low oil pressure even though i have no leaks and all new seals in the motor?
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Old 04-05-2009, 01:03 PM
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Re: DESPRET Oil Pressure and Vtec question

check your wheel speed sensor, do you have a abs light on, remember for vtec to kick in, the car has to be going 20mph
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Old 04-05-2009, 02:22 PM
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Re: DESPRET Oil Pressure and Vtec question

i have not yet checked the wheel speed sensor, although my speedometer works fine. could the speedometer work even though the sensor is screwed? also my abs light is not on
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Old 04-07-2009, 01:42 PM
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Re: DESPRET Oil Pressure and Vtec question

bump.
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Old 04-07-2009, 03:22 PM
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Re: DESPRET Oil Pressure and Vtec question

no VTEC wouldn't work if your speedometer/VSS wasn't working. If your speed sensor is messed up, it will throw a code. If your speedometer works, your speed sensor is ok.
I get a check engine light for my VSS (vehicle speed sensor) and i lose VTEC, but that's if I let it engine brake for 2000rpms. But I don't have a speedometer.

I hooked my oil pressure gauge to the oil pressure sending unit location under the oil filter on the back of the block.
I used a fitting that has the right thread pitch for honda motors, and i can even use my stock sending unit for the dummy light on the dash...plus it has 2 ports that can be used for accessories like an oil psi gauge or a turbo feed, or a VTEC conversion on B-series.

And yes its possible to have low oil pressure with new seals.... it can be caused by excessive bearing clearances.

I don't think a faulty vtec solenoid would cause the engine to shut off while driving.
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Old 05-05-2011, 08:31 AM
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Re: DESPRET Oil Pressure and Vtec question

Is your car lowered? You might have dented your oil pan
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Old 05-05-2011, 09:13 AM
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Re: DESPRET Oil Pressure and Vtec question

Quote:
Originally Posted by ShoofIsLudin View Post
no VTEC wouldn't work if your speedometer/VSS wasn't working. If your speed sensor is messed up, it will throw a code. If your speedometer works, your speed sensor is ok.
I get a check engine light for my VSS (vehicle speed sensor) and i lose VTEC, but that's if I let it engine brake for 2000rpms. But I don't have a speedometer.

I hooked my oil pressure gauge to the oil pressure sending unit location under the oil filter on the back of the block.
I used a fitting that has the right thread pitch for honda motors, and i can even use my stock sending unit for the dummy light on the dash...plus it has 2 ports that can be used for accessories like an oil psi gauge or a turbo feed, or a VTEC conversion on B-series.

And yes its possible to have low oil pressure with new seals.... it can be caused by excessive bearing clearances.

I don't think a faulty vtec solenoid would cause the engine to shut off while driving.
Quote:
Originally Posted by muteperu View Post
Is your car lowered? You might have dented your oil pan
Well reasoned. Both very knowledgeable replies.


The other sensor input that the ecu checks for before it allows vtec to engage is coolant temp. It must be at least 158 degrees (don't quote me) before it will allow it to engage.

Check out your ECT sensor for proper function. Remember, its an NTC thermistor, so resistance will go down as temp. goes up.
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