Help - LH cylinder flooding out

[Phoenix]

Hello guys,

Looking for a little help as the nearest dealer did not.

A customer of mine has a 2013 V7 Classic.  The bike will start and run for a few minutes, then bog down and misfire. After the misfire for a few seconds, it will stall out. The left cylinder has raw gas pouring out of the exhaust after this running condition. I have pulled the injectors, cleaned them, and tested them; both seem to be the same spray and pressure. I have checked the ECU info. It seems to be the last update, and no issues or errors. Here is the ECU info:
CM228301
38M363HW304
352BV738
E14
130650144
June 10th 2015

The dealer told the customer that he needed a new ECU, but at this time, they could not get one. So I am here looking for better answers and a direction to move in to help this guy out.  A new ECU, seems like a cop out answer to a tech not wanting to there job.

Thanks for the help

[Alfetta]

Hard to say...
lots of speculation...

what and why was the ECU updated, and did the bike run correctly after the update.

Assuming you have confirmed:

• cylinder pressures are ok and within 10% of each other.
• moved injectors to other cylinders to verify that its not the injector but the signal to the injector.
• replaced plugs with a couple of new ones to confirm the plug isn't faulty.
• pulled the mufflers, ran the engine to verify you don't have a plugged cat (if cat equipped).

these are just a few things that come to mind...
hope the best on you tech journey...

[Phoenix]

Alfetta,

Thanks for the reply,

To answer you.

- The ECU was updated the last time it went to the dealer in 2016 per the bulletin - this is a new issue, and the new dealer has no direction at this time. The bike was running fine from 2016 till winter of 2024. This started this winter/spring.

- Cylinder compression is 150psi on both
- I moved the two injectors over to each cylinder, and only the left cylinder is flooding out.  The injectors, when pulled, were cleaned but not labeled, so I do not know which one was the original one now.
- New plugs, checked caps, and wires all good
- No cats.

[guzzisteve]

That is timeframe that they went to single TB w/V7II. Single or dual TB's?  I have changed 5 or 6 ECU's from 1st series 15RC. Don't rule out bad ECU

[Phoenix]

This has a single TB 

[guzzisteve]

Early single TB's had 3 updated maps. They used to have to sit & idle exactly 2min until you could give it throttle. This must be the one owner had corrected. I think maybe map got corrupted at some time at maybe battery change or from dead battery.
You may want to look in the airbox for obstruction.  The temp & other sensors would effect both cylinders. Not just 1. That's why I think it's the map getting corrupt. It would have to send constant signals to be that rich. But on 1 side only. If both sides it could be plugged aircleaner or airbox
The ECU is part of the TB and usually not replaced on it's own but as a unit.
I would try download a map and reset everything.   Beetle over on the Griso Ghetto has stock and his own maps He may know what 352BV738 map is.
That was the time I was quitting the dealerships here to retirement. That's why I don't have the single TB map numbers.

[Antietam Classic Cycle]

I used a Beetle map on my 2012, with very good results. http://www.griso.org/

[guzzisteve]

Slow boat from IT

https://www.af1racing.com/CM228301-ELETTRONIC-INJECT-DEVICE---CM228301

$650 for new