ok i have a 90 EF hatch with a JDM GSR(B18C) has ITR cams and omni power valvetrain, skunk2 intake mani. DC 4-1... car has been converted to OBD-1 using a complete harness out of a 93 DA TEG. and has a VAFC-1 only running VTEC ECU is a P06 with GSR maps and converted for VTEC, but ive also used a P72 ECU and same results, and i also tried a new dizzy...oil pressure is fine, VTEC sol. screens are clean...

ok onto the problem....car runs great untill 300-500rpms into VTEC, VTEC is set at 5200, now if i disconnect VTEC it runs fine all the way to redline wich is 8600rpms....i dont know how to explain what its doing, but its kinda like a hesitation/miss fire, i dont know what to call it....

anyone have any clue what might be the problem??

 

mines pretty much doing hte same... mine is getting lean as hell for some reason.. i would try to hook up a wideband or somthing nad see if your having the same problem

 

shit sux.....runs great with the VTEC sol. unhooked...

 

I wnat to say that it might be in your wirring or maybe the computer, but you already tried a different computer. to me, it doesnt sound like a mechanical problem, since it runs fine without VTEC and with VTEC you said it miss fires and hesitates. does it also back fires?

 

Check your plug gaps.

 

it could be something in the wiring, i got a pin-out and diagram for the harness im gonna go through everything....no backfiring, and its not really a missfire, it just feels sluggish and hesitant....


already done that, ive had 3 sets of plugs in it....same thing...

 

Hmm, if the ecu is chipped, have a tuner check out the fuel maps for the secondary cam lobes and make sure they are ok.

 

check the a/f... mines doing the EXACT same thing... its getting lean as hell when i hit vtec.

 

[QUOTE=TIM TIM TIM]check the a/f... mines doing the EXACT same thing... its getting lean as hell when i hit vtec.[/QUOTEi dont have access to a wideband...so i dunno what the a/f looks like...


already did that....had a new map burned and same thing...tried a stock P72(GSR) and it ran a lil better but for some odd reason, 1st/2nd gear goes to 8k+ but when i go into 3rd/4th it his the rev limiter at 6500....wierd shit

 

i understand you tried a new comp.. but have you checked the a/f of your car running? we have used 2 diff computers on my car and its still doing the same thing also.. im not forcing, it just sounds like my problem.. i know what my prob is, just not how to fix it lol