......besides low oil and a bad vtec solenoid?

 

Insufficient oil pressure, insufficient coolant temperature, plugged screen in the valve assembly, bad wire going to the selenoid, blown fuse, anything that causes the ECU to go into limp mode ...

Basically, if you have oil pressure and it is getting to the valve, and you also have voltage getting to the selenoid, then VTEC has to engage. When the valve lets the oil past, the pins only have one place to go.

 

gottcha, thanks!

 

Also one that happened to me.

Clogged Cat. FTL

 

MAP sensor reading more then 10 psi.
Missing vtec pins due to poor cam and rocker installation.

 

I've seen this...very tough diagnosis.

 

cold mornings after startup

 

VSS well on a bseries motor atleast

 

Low v-tec fluid.....you better change it




































jk hahaha.....couple things could be wrong

 

I've heard of it, but thank goodness I've never had to diagnose it.

Of course, once you know there is sufficient oil pressure getting to the pins and the pins still aren't engaging, that's probably a good clue that something is causing the pins to jam. Of course there's no telling how long it might take to realize that seemingly obvious fact. LOL, if the diagnosis was being done here, on line, there is no doubt that the owner would neglect to tell us that there had been some recent engine work.