vsmhatched

well, So i got a 96 Ek with a gsr swap..anyways, i was running a obd1 p72 with a boooslang jumper harness. Well, I dont like using those jumper harness things and never have, so I got ahold of a obd2a p72 ecu...so I unplug the boomslang and obd1 ecu and plug in the obd2a p72..wire up vtec and knock..so im thinking im ready for a test drive...So i go out for a quick drive to make sure it works, well I got to 6,800 rpm and it hits a rev limiter..I was like WTF??? So I unplug all the vtec wires considering maybe i screwed something up?? but it still hits a rev limiter at 6800 and wont let me go past..So i'm thinking the used ECU i got Maybe Chipped, so i open it up and nothing, just a normal looking inside of an ecu..any ideas guys????Im lost

vsmhatched

bump...I need to get the car running right so i can drive it back to TN

JDMlyfestyle

any sign of a CEL?

also ive been hearing about people swapping SOHC Auto ECU boards into a P28 or P30 and selling them as if they were a p30 or p28

vsmhatched

well, only cell is for a 2nd 02 sesnor beucase I dont have one plugged in casue the obd1 ecu doesnt read for a 2nd one like the obd2a ecu's do..so I know that wouldnt cause it..also, it was purchased at a shop called One6 motorsports in IL

vtecspeed1320

there is not a p72 thats obd2...there is nothing wrong with the jumper harness and an obd1 p72

vsmhatched

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by vtecspeed1320 &raquo;</TD></TR><TR><TD CLASS="quote">there is not a p72 thats obd2...there is nothing wrong with the jumper harness and an obd1 p72</TD></TR></TABLE>

bullshit...i have a obd2a p72 ECU...

barcode number on the side is 37820-p72-A02
970-101896


and the harness just creates a wire looking mess

fmrprojects

check to see if you have any codes. usually if you have one the ecu automatically goes into limp mode and doesnt let you go to redline because it might damage the motor

vsmhatched

OK..i've checked for Codes, it throws a code for the secondary 02 sensor..I mentioned that before...I know the car would go into limp mode because of a 02 sensor..I know this because i've driven without one..but

the Rev limiter is encoded into the ECU, so you guys think its been tampered with???

vsmhatched

[QUOTE=GreyDel]OK..i've checked for Codes, it throws a code for the secondary 02 sensor..I mentioned that before...I know the car would go into limp mode because of a 02 sensor..I know this because i've driven without one..butQUOTE]

WOULD NOT GO INTO LIMP MODE, my bad

vsmhatched

ok...well, I just got back from messing with it more...I put in a jdm type R ecu, (p73) and It came out of a working car, so I plug it in my Ek and go for a drive...It had vtec but hit a rev limiter at 6800rpm, WTF...stick it back in the R and it goes to 9 grand??? So next I try a LS ecu, well, of coarse vtec isnt going to work..but this one hits its normal rev limiter at 7200 or so...

so, im pretty lost at this point considering the ECu's are good, but somethings wrong with the harness or something..

BTW, I just replaced the coil, cap and rotor.. im sure that ties into it all some how

vsmhatched

bump for help

JDMlyfestyle

sounds like ur ECU is fucked buddy.. either someone swapped boards with another ECU or some part of the board is blown

Slamaccord

iTrader: (1)

Your car is in limp mode.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by JDMlyfestyle &raquo;</TD></TR><TR><TD CLASS="quote">sounds like ur ECU is fucked buddy.. either someone swapped boards with another ECU or some part of the board is blown</TD></TR></TABLE>

he said he use a p73 ecu and it did the same. There for its not the ecu.

Why don't you just wire the 2nd O2?

Get everything wired like it supposed to be and come back with some feedback

vsmhatched

well, I got the 2nd o2 wired up, and everything going good...so no check engine lights now...

then..i go for a drive, goes to 8 grand, then again, so I'm thinking YAY i fixed it...

well, as weird as this sounds, everytime i put the car in any gear 1-5 it goes to 8 grand and revs how it wants too. Well, after I put the car in reverse and back up..then put in first to take off...it hits a rev limiter at 6800 snd throws a code 22, vtec oil pressure switch..but it only comes on after i go into reverse...i go take the car to 8 grand and have vte work all day long as long as i dont go into reverse...but ias soon as i go into reverse..it throws the code...I know it sounds crazy and i've never heard of anything like this before..but why would it work just fine until i go into reverse?????thats what im lost on now???