No 4 cylinder no spark. - CBR Forum - Enthusiast forums for Honda CBR Owners


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Old 07-13-2018, 04:58 AM
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Default No 4 cylinder no spark.

Hi Guys.

F4i 2003. 55,000 miles.

No 4 cylinder isnít sparking. Iíve changed over the plugs and coils from a good cylinder and still no spark. I can attach a coil and plug originally from cylinder 3 on to number 4 and it doesnít spark. Take the original coil and plug from number 4 and it sparks on number 3.

Compression test is all good and fuel is getting to cylinder 4.

Any further ideas?

Regards.
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Old 07-13-2018, 05:35 AM
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Check for a break in the wiring or a bad connection in one of the harness connectors. You may have a bad ECM. Do you have access to a known good unit to plug in and try?
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Old 07-13-2018, 06:37 AM
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I donít have access to a ECU unfortunately. Any idea where I could purchase one from?
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Old 07-13-2018, 10:18 AM
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Ebay.
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