2000 LS with gsr engine

[bigg86]

i just bought a 2000 integra ls and the guy that i bought it from installed a gsr engine in it. now, the thing is that it came with a 2000 ls computer, then i got an OBD2 p72 ecu from another guy but when i tried to plug it in,... only one of the plugs fits, the rest do not.... so i was running with the LS computer for a couple of days but the engine wouldn't idle it stays at about 2500rpms all day.... then my other friend let me borrow his p28 with the obd2 to obd1 jumper, and the car runs a lot better. but rpms stay at 1500....i'm not familiar with all this ls to gsr conversion so i dont know what i should do besides running the vtec wires which are not hard to do at all.
Has anyone done this before? any clues?
thanks for your help.....

 

[LS_VTEC]

From what your saying, it seems that your integra is running a gsr engine with a obd2b integra ecu. The p72 you bought, is apparently obd2a since only one plug fits. So your friend had a p28, with a conversion harness which converts obd2b to obd1. Now, is the p28 you put in chipped or stock? Also, check to see if the prior owner of your car ran wires for vtec.

What you may need to do is contact www.boomslang.com for a harness conversion and pickup an obd1 ecu chipped to run b-series. The harness usually runs about $125-150, plus shipping costs. Vtec wiring may be needed as well as the knock sensor.(all gsr's have one).