This is on a basically stock 1996 GSR. OBD2 ecu. The story is this.....
-I recently replaced my gsr block with a JDM B18C block.
-There is no crankshaft speed fluctuation sensor on the JDM block, I'm throwing a code 54. That's all the codes that are being thrown
-Used a headgasket i got off of ebay. Maybe it's blocking off an oil passage?
-I upgraded the valvesprings when the engine was apart. While doing so the rocker arms didn't come out but did move independent of each other. I had to push the pins in to get the rocker arms together.
-I washed the head with the vtec solenoid still attached.
-11.70v at the VTEC solenoid plug and continuity.

Can the unplugged Crankshaft speed fluctuation sensor prevent VTEC from engaging?

 

what head gasket is it?

 

Funny thing is when i recieved it in the mail the packaging said b16/b17/b18 head gasket. I looked at it kinda funny but it fit well. Maybe it fits all b series but blocks off a vtec oil passage. Grrrrrrrrrrrr

 

when u throw an engine code ur ecu goes into limp mod so no damage can occure.(pending on code)

 

Yeah that's what i need to know for sure. If the code 54 will disable VTEC. Any other opinions?

 

Checked the cam caps. They are all pointing the correct direction (arrow to the cam gears). Damn what could be wrong? Headgasket? Code 54? something else?

 

true limp home mode creates a rev limit at 5K also... did the problem come on gradually after you put the motor back in or right away when you installed it?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by MikeSarr_GSR &raquo;</TD></TR><TR><TD CLASS="quote">true limp home mode creates a rev limit at 5K also... did the problem come on gradually after you put the motor back in or right away when you installed it?</TD></TR></TABLE>

Right away. VTEC never worked after i put the motor back in. Do you think water could've damaged the VTEC solenoid when the head was washed? I can rev to 8k so I'm not in limp mode.

 

heres the thing. if you have a OBD2 GSR or any GSR computer with the stock map,
as you should know VTEC is at 4500RPM. thats when the cams change over. 5700 is when the secondary runners open which is reciprocal to the VTEC in an ITR. so, I am still shady on what you mean by VTEC not working. what exactly are you experiencing? Is it slapping in and out after 4500rpm? Is it just feeling weak? You need to be more specific.

 

VTEC (cam lobe x-over) is not engaging. It's like driving an LS no noise change whatsoever and one pull all the way to redline. Before i was able to hear a click of the solenoid and the note of the secondaries opening. None of that is happening now. I've never driven a stock GSR but i doubt the vtec xover is supposed to be so quiet you can't hear anything.

 

au contraire...

the stock GSR vtec point is virtually seamless unless you throw in some f-ed up cam settings or larger cams on the stock computer. if your IAB isnt working I dont know what to tell you there... my pop drives a stock GSR and the VTEC is non-audible until the IAB comes in, even then everything is muted but it goes!
PS: the VTEC solenoid has nothing to do with how your secondaries open.
Just so that you know...
when you hear a pop in your power like baaaaaBBBAAAA! it means there was a lack of power before the pop. if you are dynoing your car and the VTEC pops hard and gains, great... but if it pops and dips the comes back.... no good. this is near impossible to distinguish by driving and hearing. if it is smooth, IE no pop... it means that the transition into power was seamless and smooth. This is what the GSR was designed to do stock, i.e. having the stock intake manifold with the dual runners, etc.

 

I guess i'm used to hearing the secondaries open up. I used to have the IHE combo and it was audible. Now i'm back to all stock and i'm thinking something is wrong. Damn is this what it's supposed to be like? I'm gonna dyno it and see what the power output is.
But before i could hear a click when it reached 4700 or whatever my xover was set to. Now i don't. I don't hear the secondaries open up either. Well the dyno will tell.

 

that was my next suggestion. once you see the powercurve on paper you will know what you have.

 

When i had the IHE combo my HP and torque curves were very flat, but vtec was still audible. I need to do a baseline before i start modding anyways. We'll see.