Vtec troubleshooting

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obetosaio

Junior Member
Here's some history

Setup = B18c1(98)(69000km) hatchcx(95)
LSD tran (5spd)
DC airintake
removed butterflyvalve intake man
no PS nor AC
ECU ischipped redline=5800 no speed gov. and fuel curve

Here's the Problem
Vtec sometime doesn't kick in. Ihave been noticed from time to time
vtec doesn't really sound as agressive fromtime to time
Now one time when vtec didn't kick in it was about 28f outsdie
started it idle for about 45 sec then let it rip to 5800rpm
didn't kick soon tried just slowly goin into vtec nothing tried it in third gear nothing
at a light turn off car and restarted tried Vtec again it hit tried three time after hit each time. BUT note that it sound less agressive than usual and running @ idle temp
If you know how troubleshot this Please give your thoughts ....
:roll:
 
VTEC will not engage if the car is cold
VTEC will not engage if the oil pressure is low

there are a few other things that effect it
 
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