so i been trying to diagnose this for a couple of days...started sunday night after a friendly street race and hitting a pretty decent bump.....anyways....after the car is fully warm and everything vtec will work for like 2-3 times then it will stop engaugeing and even at time it will be in vtec and just fall out...im thinking ots something with oil pressure but the light isnt on....ecu is good, the solenoid clicks, no check engine light.....i took a test light and hooked it up to the solenoid wire and at 4800 it lights up and lets me know juice is goin to the solenoid but there is no vtec...im running a virgen p28. no idea what to look for anymore. the oild pan has a minor dent but it has always been there and im running 10w40 oil....if any1 got any ideas please help.

 

Is the vtec pressure switch and solenoid wired into the harness and then to the ecu or is it directly from pressure solenoid to ecu?

 

they go driectly into the ecu....vtec worked fine for like 700 miles then it started acting up.

 

ok because mine used to do that and I guess after a few really hard launches it like knocked the wires loose from the ecu, so I had to rewire it into the ecu. Maybe pull of the ecu cover and look at the wires and see if they are still connected properly.

 

yeah i checked already and im getting a signal from the ecu to the solenoid at 4800 so that tells me that the wiring should all the good.

 

Maybe you slightly dented your oil pan when you hit that bump, if the oil pickup tube is restricted at all, vtec can be totally cut off or works only now and again, as you need enough oil pressure.

 

Yea and you said you didnt have any CELs on, I had the code for the pressure switch and solenoid flashing. Damn well

Bump

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by britishlude &raquo;</TD></TR><TR><TD CLASS="quote">Maybe you slightly dented your oil pan when you hit that bump, if the oil pickup tube is restricted at all, vtec can be totally cut off or works only now and again, as you need enough oil pressure.</TD></TR></TABLE>

yeah thats the only thing i can possibly think of, so today after work im dropping dat b*tch down and bangin it back straight, hopefully this will fix it, cuz it was good right before the bump.

 

While the pan is off check the oil pick up tube real carefully, just to ensure it's not suffered a slight squashing.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by britishlude &raquo;</TD></TR><TR><TD CLASS="quote">While the pan is off check the oil pick up tube real carefully, just to ensure it's not suffered a slight squashing.</TD></TR></TABLE>

yeah most deff

 

so infact the crushed or dented oil pan was the cause of having no vtec....there was a mark on the inside of the pan where the oil pick up tube had touched, so i made it as perfect as possible and i have vtec all day

thanx a lot fellas.