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Discussion Starter #1
Good evening everyone,
My fiance has his Prelude swapped from a H23a2 to a H22a JDM. But we have the problem that it wont start. The engine is stock, H22 and the engine bay and everything inclusing cables is H23. We used a H22 tree and mixed it with the H23 to see if it works. The ECU is also H22. Anyone advice?

Greetings from Holland
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Hi,

So he has a 4th gen Prelude that was originally H23a which is now H22a. What comes to mind is the ECU, engine wiring harness (which would have proper VTEC wiring vs. the H23 harness), starter, injectors, distributor timing, verifying the cam gears were TDC when putting on the timing belt, and that the JDM engine you have might be an OBDII, not an OBDI. What year is his Prelude? OBDI is 92-95 and OBDII is 1996 only. If it is, then you'll need to do some conversions. There are a lot of variables as to why the engine won't start. Will it crank over?

Sorry, but not much to go off of.
 

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Discussion Starter #3
Its was H23a2 before, and is also OBD1. It does crank. Timing is correct, the H22a is complete stock. We tried to mix the H22 and the H23a2 harness
 

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The chassis is OBDI. That's good. What about the JDM H22a? And could you elaborate on mixing the harnesses?

From my experience, an engine needs 3 main components to run: fuel, air, and spark.

If it cranks, it means power is going to the starter. Before anything else below, remove your spark plugs.

Let's start with the distributor, sparkplug wires, and injectors. Crank the engine and ever so slightly remove one of the spark plug wires from the distributor cap. it should be only 1mm or so from the post and you should see an actual jump of electricity flowing from the distributor to the spark plug wire. If you don't, then stop there. We know it's an issue with the distributor or spark plug wires. If you do, move to the injectors. Remove the injectors from the intake manifold but still keep in the fuel rail. Keep the banjo fitting on the fuel rail as well. Place some towels between the manifold and the injectors (still attached to the fuel rail) and crank the engine for a second or two. Do you see fuel pouring out of the injectors? If so, stop there. Replace them.

If you have bad injectors, then you've been cranking the engine and pouring fuel into the cylinders. This would wash away any oil that has been forced up by cranking the engine. Once you replace the injectors, and the spark plugs still removed, place another towel on top of the valve cover, then crank that engine to force out as much fuel as you can.

Stop when there aren't any more rockets of fuel shooting out of your cylinders into the air. Now take off your valve cover. Crank the engine until you see oil begin to be pushed into the head. Then put everything back together (make sure your sparkplugs have not been fouled) and try starting the engine.
 

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Have you also got the fuel lines the correct way around as it will only flow in one direction. If as above and you don’t have fuel coming from the injectors at all or none in the fuel rail then it is a good chance that you have the fuel return and feed pipes connected back to front. Swap the fuel lines if it starts problem solved.
 

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Discussion Starter #6
It has fuel, it has spark and also air. The H22a is also OBD1,we bought a blue top that is made for the 4th gen.We didnt change anything on the fuel lines and its connected how it should be. We only have taken the VTEC wirong from the H22 harness amd put it on the H23 harness
 
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