i got a question i got a 95 acura integra with a fully built lsvtec im running a obd1 to obd2 jumper harness connected to a type r ecu every time i try to rev it wont go past 6k the ecu is fine cuz i took it off nd put it on my boys car nd rev nd it took it all the way to 8k do u have any idea wat it could be?? i appreciate for the help

 

any CEL?

 

vtec isn't crossing over. you have a loose plug or wiring issue. using the correct knock sensor is one place people often screw up with these. also, if you have a JDM R ecu you better have ITR/CTR cams. anything else isn't going to be tuned properly.

 

Is your oil low?

 

oil is good

 

everything is connect no loose plugs or wires and yes im running ctr cams

 

anybody else have any ideas i herd it could b the distributor is that true??

 

vtech solenoid?

 

The correct distributor for that combo is the td84u. Still if vtec isn't crossing over a mistake was made somewhere and or the distributor I suppose. Never have had to troubleshoot that before since I normally just use the correct parts

 

btw on the gsr's after 6k thats not vtec thats the secondaries in the intake mani. the vtec is around 4.5 when smashed and 5k when not smashing

 

where did gsr come from?

if for some insane reason he has a GSR manifold with the ITR ecu that would be the problem. the p73 won't control the secondaries.

 

its a jdm b16 head im running a skunk2 pro s intake manifold..any other idea guys let me no and yes vtec does cross over at 5k and doesnt go past 6k not a good mix with my b16 tranny

 

bump help me out honda tech!

 

any idea's what i should double check?? or replace??

 

vtec crossover on a jdm p73 ecu is at 5800rpm

there is a pretty aggressive crossover with the ctr cam p73 ecu combo. i really doubt that it's crossing over and falling on its face which of course means it's probably not crossing over. i've had a faulty vtec solenoid cause this before myself. they rarely fail which of course leads me back to what i told you before.

you need to double check your wiring pinout to the ecu, unplug and replug your sensors used in vtec, this is the solenoid and knock sensor in the back of the engine. with the KS just make sure it's clipped. make sure you have a td84u distributor.

also, look up the voltage change when vtec engages at the solenoid itself. tap and run lead wires off and test with a voltage meter while driving.

 

yea ima hook up the right dizzy and tomorrow ima check the voltage on the solenoid wat should the voltage on the solenoid read??

 

got me, what you should see is a change at 5800. the other post with the GSR sounds like the iab, in your case it's different and sounds like vtec isn't engaging. i suggest unplugging and replugging the solenoid and checking everything from the pin out to the solenoid to the distributor. it's a fairly simple system you just need to start eliminating possibilities until you find the mistake.

 

true iight tomorrow ill re check the wires nd connections another thing this afternoon i took the car around to warm it up i turn off the car and turned it back on i rev it nd it whent all the way to 8k then i rev again it whent back to 6k any idea's??

 

you do realize vtec only works when the car is warm. if the engine is still in warm up mode it won't cross over.

if you have it working sometimes and not others it's almost certainly a wiring or plug issue. i've seen unplugging and replugging the vtec cure this before. not saying it will with you but this really sounds like a connection issue.