Ok so here is my situation... I had b20/vtec in my 92 hatch and it dropped a valve. So I pulled the motor and I put in an obd0 LS motor. I got a P75 obd1 ECU for it. And I re-used my GSR wiring harness. I am still using the obdo intake manifold too(but I made some block off plates for vaccum leaks)

My problem is.... Ok I got the motor in with everything hooked up. When i start the car is takes a sec before it actually starts... but when it does start it idles at 3000 rpms. And it kinda sputters a bit. It throws a few codes too.... 4(CKP{in dizzy}), 6(water temp), and 7(TPS). Now the TPS and the water temp I already know about. Timing is perfect and I cant find any vaccum leaks. I got a BRAND NEW dizzy and it throws the same codes.

Now here is where I gave up and decided to ask you guys. We took my buddies OBD1 P72 GSR ecu and plugged it in to my car. The car still idled real high but it didnt throw the Crank pos. Sensor(code 4). The only one it added was code 21 witch is for vtec so that was expected. ALSO, the motor idled high still but it wasnt sputtering anymore.

Now to make it even more confusing we put my P75 ECU into his gsr and it ran perfect! No codes and no problems what-so-ever! Please help ASAP I need this car for school!

 

you're useing what obd 0 manifold? a p75? what TB you using?

you definetly have a vacume leak in the manifold somewhere...i bet its coming from a hole at the throttle body you probably have the wrong TB gasket not covering the holes its suppose to..

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by onepoint6i &raquo;</TD></TR><TR><TD CLASS="quote">you're useing what obd 0 manifold? a p75? what TB you using?

you definetly have a vacume leak in the manifold somewhere...i bet its coming from a hole at the throttle body you probably have the wrong TB gasket not covering the holes its suppose to..</TD></TR></TABLE>

Yes I am using the obd1 ls mani with a gsr TB. I am pretty sure I am using the right gasket too. But I will check. And that doesnt explain the code 4

 

must be something to do with you using a gsr wiring harness.

 

how u figure?