james h
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| posted on 10/4/15 at 08:48 PM |
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Only half the cylinders are firing
This is on a 2001 5JJ R1 engine.
I thought I'd sorted the issue of 2 cylinder running with new plugs and a coil (to replace the one that melted itself against the exhaust
manifold), seems not!
The coils are fine, the feed to them is not. There are 4 wires to two coils:
- One red/black ignition wire spliced into two
- One grey wire (signal wire?) for cylinders 2 & 3
- One orange wire for cylinders 1 & 4
Weirdly the coil that had a slightly melted casing was the one controlling the two cylinders that currently work. Its the feed to the other coil which
seems bad. Could it be a massive coincidence that just after the coil fell onto the exhaust that the problem with ignition happened immediately
after?
Anyway, it seems I'm not getting a signal down the orange wire. This wire starts from the ignition control unit/ECU with the grey one, then to a
connector just upstream of the coils.
I'll try a continuity test tomorrow, but it means stripping down some of the engine bay. I'm hoping I don't need to swap the
ignition control unit for a new one.
In the meantime, has anyone had a similar problems, or any suggestions? I am annoyed having missed all this lovely weather!
James
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r1_pete
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| posted on 11/4/15 at 09:29 AM |
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An alternate theory, the CDI Unit or trigger unit went bad, which caused rough lumpy running, which caused the coil bracket to fracture....
Unless its a broken wire or a bad connection, I think you're into replacement trigger or CDI unit..
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james h
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| posted on 23/4/15 at 09:50 PM |
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Sorted now. I replaced the ICU and I'm back to 4 cylinders. Initially I used the new (eBay) coils but turns out one spark plug cap was broken
internally and then gaffer taped up. The one I melted worked!
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