4th Gen accord with h22a jdm
My vtec worked for 1 day and now my car redlines at 6500 and the only code
i get is 23 with my p13 ecu and vtec will not engage when i turn the car off
the check engine light goes out but as soon as i drive it comes back on and the
only code i get is 23 everything else is fine

code 23 is the knock sensor i knoe
but how can i check the vtec pressure switch
and the vtec solenoid

 

did you wire in the knock sensor on your ride

 

i had a simuliar problem but it was the tps and vtec felt like it was not kicking in, my suggestion is to get a chipped p28 and you no longer have the knock sensor problem at all that is the ecu i run and all is great

 

but if it was the tps why would it not throw the code

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by nelsond &raquo;</TD></TR><TR><TD CLASS="quote">4th Gen accord with h22a jdm
vtec will not engage when i turn the car off
</TD></TR></TABLE>
that seems to be your problem.... or grammar.