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Manifold of the D15b was installed so the injectors with it and switching the MAP & TPS prob cause a bigger problem than that!

For future reference the idle problem was caused by the IACV which needed to be a 2 pin type and the low RPM performance issue was due to a defective ECT switch or ECT sensor (not sure which one since I swapped them both from the old engine in the same time!) Thanks for all your help guys and if...

I know this is 4 years later, but I currently have the same problem.... What ended up being your problem and how did you fix it? Thank you

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Does anyone know that using an OBD2 dizzy on a OBD1 head causes issues? If so what are they?

Perfect, thanks. As for the dizzy it seems to be working right, i just had to drill out the slots in order to make the bolts fit and to give the dizzy some play so that i can time the ignition to 16* once the idle issue settles down!

Here is the story: I installed a D15b in my 98 civic DX, here are the details, I swaped the intake manifold with injectors of the D16Y7 on the D15b, kept the D16Y7 harness, put a P28 ECU with OBD2A to OBD1 conversion a harness, plugged in the Vtec into the OBD1 harness, kept the crank pulley...