Hey guys, I got a 91 Prelude Si that originally came with a B21. I recently blew the headgasket, so I bought a motor off of HMotorsonline.com. The motor I purchased was a B20, and I had to switch a few things around, like the exhaust manifold, intake manifold, and thermostat housing. I just droped the motor in on tuesday, and I tried starting it yesterday. Everything is hooked up, no loose wire, everything is plugged in. The exhaust manifold is cut after the oilpan, because it was the only way i could get the manifold off to swap them. I checked for spark and fuel, and I'm getting both. the first time starting it, the front grounds werent hooked up all the way. and the back ground connected to the intake manifold started smoking pretty fast(pretty sure because the ground was getting overloaded but if it can be another reason please tell me). Is there anything else that I should be looking for? Please LMK. This is getting pretty irritating.

 

you have a dead short with something contacting your intake manifold somewhere i would think. If it smoked it would be high current, almost like direct battery or something...injectors?
Check all your grounds and refer to ground connections throughout entire car. if any are missing alot of systems might not function safely.

just wondering, what did you do for header now? reweld or aftermarket

 

If I can find a aftermarket header for cheap, I'd buy it. Which header can I look for, saying its a B20. GSR? LS? or any B-series one? Help me out.

I'm going to take a look at all grounds again. I hooked up the front one and it didnt burn after. Do you know of any online wiring diagrams that would show all the engine grounds?