ok here is the deal i put a b16 civic in my 97 civic lx. i have a chipped p28 that i was running on it and it was mis-firing, acting funny and was not letting me get the engine going like it should. the ecu was idling at about 400 rpms to 600 rpms. so i took the chip out and then the engine was idling at 2000 rpms. now here is the kicker i put my stock 97 lx ecu in and it purred like a happy cat it was so smooth no mis-fire nothing i even took it for a test run around the block and it ran perfect. little problem but it is minor like antifreeze and a exhaust leak but it was running so good. now i don't know what to do next is the ecu shot? should i throw the chip out and get a new one? should get a new ecu? i need some advise thanks guys

 

did you use a jumper harness obd2 to obd1?

 

oopps forgot to tell you that yes i am using a jumper

 

It could be due to the IACV, as the P28 looks for a 2 wire IACV, whereas the 96+ Civic DX/LX has a 3 wire IACV, if I am correct..

 

nope i had that as a cel and i fixed it i thought it was it as well but it is not i am thinking it is the ecu because why would it do that?

 

id get a stock p30 ecu and try that, probably will run better then a chipped ecu anyways

 

so with the p30 i have to run the knock sensor right? i was going to do that this weekend my boy has one but it is also chipped! so i don't know what to do then

 

yeah you would have to run the knock sensor but its only 1 wire to run, definitely worth it

 

hey i will go for it let me see how it runs with my boys ecu and if there is a difference then i will get one but do you think that my ecu is bad or what? let me know what you think

 

If you are not getting any CEL's then you can pretty much rule out the wiring and ECU harness. There's a lot of chipped ECU's out there that haven't been properly chipped and/or damaged in the process. Not to mention all the countless "make your car run like ***" chips that are floating around. It would be best to have your ECU checked out and possibly rechipped by a well-known ECU expert - contact Kenji, Katman (K@man), Newman, etc. here on H-T if you want to go that route. A P30 would best suit the motor if it's basically stock with minor bolt-ons.

 

when you took the chip out the ecu was in limp home mode.
you need to remove a jumper to unchip the ecu and force it to run on the stock p28 map.