Summary so far:
I replaced my EN07V engine, which had melted spark plugs on the #2 and #3 cylinders and chipped intake valves, with a used EN07F engine.
The EN07V is SPI, while the EN07F is MPI, which means there are several differences.
I used the intake manifold and harnesses from the original V, and only used the engine mechanism from the F.
After the conversion, the engine wouldn’t start, and I confirmed that there was no ignition spark.
- ECU power supply was normal
- Ignition system was normal
- Replacing the cam position sensor did not change the situation
- Replacing the ECU did not change the situation
So,
I suspected that the shape of the cam angle sensor plate attached to the cam sprocket might be different, so I decided to remove the cam sprocket and compare it.
Once again, I removed the right rear wheel, crank pulley, and timing belt cover…
The cam angle sensor plate attached to the cam sprocket of the EN07F (new engine) looked like this.
On the left is the EN07F cam sprocket and cam angle sensor plate (new engine).
On the right is the EN07V cam sprocket and cam angle sensor plate (old engine).
The shape of the plate is difficult to see from the front.
This is the back side.
On the left is the EN07F cam sprocket and cam angle sensor plate (new engine).
On the right is the EN07V cam sprocket and cam angle sensor plate (old engine).
The plates are completely different in shape.
Perhaps this is why the spark plug didn’t fire.
It’s a difference that makes sense if the ECU can’t get the timing right.
I installed an EN07V cam sprocket.
Since the ECU is for the EN07V, I suspect that this cam sprocket will also be fine.
I lowered the tension roller, re-tensioned the timing belt, and reassembled.
I’m not sure how many times I’ve done this.
I’ve gotten used to the procedure, but I’d like to finish it here.
But, of course, the engine wouldn’t start.
It felt like it was rattling a little… Hmm, it just wouldn’t start…
I tried to unplug the high-tension cable to check the plug, but it was too stiff, so I pulled it with all my strength and the connector broke. Oh no! (crying)
To make matters worse…
The plug seems a little wet, so it looks like fuel is getting in, but I’ll have to check.
I removed the high-tension cable from the old engine and installed this one.
However, the engine still won’t start.
I’ll have to check again to see if there’s sparks and fuel, but I’m overwhelmed with disappointment and don’t feel like trying, so I’ll call it a day.
~To be continued~
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