i have a 97 ITR motor in my 99 si and have encountered a problem where when attempting a vtec pull you can slightly hear vtec engage i believe not nearly as loud and audible as just 1 week prior to today and the motor dose not seem to pull hard at all now. Motor is a fresh rebiuld bored block 84mm sleeved and has just basics like intake, exhaust, etc... its running on the stock b16a2 ecu currently. has correct oil level, no air pockets in coolant hoses all sensors pluged in securely. the are no CEL's pertaining to this problem im having all i get is a secondary 02 catylast below threshold because of empty cat. only problem i can come up with that may be the casuse is i havent traced back any wiring to my ecu so there may be a flaw there but am still looking for someone to point me in the right direction. oh yea and for some reason there is no screen in my vtec solonoid rubber seal but i checked it to see if it was clogged and no change in performance. Somebody on here has to be able to help me out some how

 

jdm motor w/ usdm ecu?

 

yea thats right been running fine like that up untill now for about 2 years before rebiuld

 

but you do have a CEL? correct

 

yea just about the cat cuz its gutted

 

bump help a brother out

 

how long has the cel been on?

 

comes on every 30 miles or sumthin i usually turn it off my car used to run fine and still had that same cel that would come on

 

responded to your pm

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by hondasicrfex &raquo;</TD></TR><TR><TD CLASS="quote">i have a 97 ITR motor in my 99 si and have encountered a problem where when attempting a vtec pull you can slightly hear vtec engage i believe not nearly as loud and audible as just 1 week prior to today and the motor dose not seem to pull hard at all now. Motor is a fresh rebiuld bored block 84mm sleeved and has just basics like intake, exhaust, etc... its running on the stock b16a2 ecu currently. has correct oil level, no air pockets in coolant hoses all sensors pluged in securely. the are no CEL's pertaining to this problem im having all i get is a secondary 02 catylast below threshold because of empty cat. only problem i can come up with that may be the casuse is i havent traced back any wiring to my ecu so there may be a flaw there but am still looking for someone to point me in the right direction. oh yea and for some reason there is no screen in my vtec solonoid rubber seal but i checked it to see if it was clogged and no change in performance. Somebody on here has to be able to help me out some how </TD></TR></TABLE>
your butt dyno needs to be recalibrated.

no offense man, but i dont see a problem. just because it feels a little slower dosent mean something is broken. hell a weather change can cause slight power losses.

 

i took that into consideration buts it not possible i have only been drving my car hard for 400 sum miles its ridiculously slower and vtec is not engaging like it should

 

Like i said in the pm's. Talk to the people that built your motor, but first i would suggest buying whatever needed to fix the CEL.

 

bump it bump it

 

maybe because the CEL is on, the car is running in safe mode? or closed loop or whatever its called haha

 

Or maybe you're just so use to it.. it just feels slower because you're expecting a gain from a rebuild... try a different ECU out.. maybe you're wiring blew out your ECU or short circuit.. Can you still take your RPMs up to the 8K fuel cutoff or wherever the B16 ECU goes up to???? It might just be an ECU problem.....

 

no the motor ran fine after the rebiuld then somthing happend to cause this loss in power when vtec should be gauging

 

Wednsday afternoon bump

 

my o2 code gets thrown as well..(i too have my cat gutted on my 00 si)...but my vtec still engages...i know this because i hit t3h m4d vt4x on da freeway as i race minivans