Flashing check engine light, engine stutters, goes away when I back off throttle

[djohnk]

OK, I have been having a problem since I recently purchased a used Ulysses. I am really pushing the bike (about 70-80mph, sometimes against the wind, with about 450 pounds of weight on the bike - two people and luggage). I twist the throttle a little more, and the check engine light flashes and the engine stutters at the same time. Every time it happens it scares the crap out of me because I think I blew up the engine.

I back off down to 70mph and the problem goes away. I checked the codes with ECM spy and it shows no codes. Although I did get a code 13 once when I used the jumper method.

The bike is a 2007 Ulysses with about 34K miles.

I have done the following stuff since I purchased the bike, some of it because I didn't know the bikes history and wanted to do preventive maintenance:

V-twin Mobile 1 full synthetic
K&N oil filter
NKG irridium spark plugs - heat range 9 I think (the old plugs were extremely black with carbon)
New spark plug wires from ironmachine.com
Added an extra ground wire to the coil from the battery.
Breather reroute with catch-can.
Race map
TPS reset
New Bosch O2 sensor (white residue on the old sensor)
New cooling fan (old fan failed - had accumulated a lot of grease/oil on it)
New drive belt (old belt failed)
K&N Air filter.
New battery with trickle charger maintenance.
I wired open the interactive muffler.
I also replaced a missing cap leak on the throttle body (vacuum leak).

Am I just asking too much of the bike when I crack the throttle at 80mph? I'm thinking of doing some data logging, maybe the bike isn't getting enough fuel? It feels like its running good just before it happens, I barely have the throttle twisted. I'm a pretty big guy, about 300 pounds... maybe the old bike can't handle all the weight with my girlfriend, myself and luggage.

The first time it happened a BMW GS1200 passed me, and I wanted to tag along. Same thing happend with a Harley ... I didn't like it [sad]

Any suggestions would be appreciated.

 

[jimijeans]

The interactive exhaust cable or box [may] be the gremlin OR the exhaust valve in the Muffler upon the Throttle being applied at being wired open at that speed can't compensate fast enough so at 80+ with two people is Very risky with all the weight applied plus mileage. Might want to check out for codes in ECM Spy plus the data logging is always a good thing. Might want to Reset (TPS) before doing anything and see how it goes. If you wire the Exhaust open you will lose the midrange on the engine and at above 77 mph may have no Quick response to Throttle after that speed. Try the Throttle Position Reset Daves DIY videos all in one Thread on this Forum, should hopefully get you in the right direction.Welcome to the Forum.~Jimi

 

[anrkizm95]

DDFI Trouble Codes

Code No. Fault Condition
11 Throttle position sensor
13 Oxygen sensor
14 Engine temperature sensor
15 Intake air temperature sensor
16 Battery voltage
23 Front fuel injector
24 Front ignition coil
25 Rear ignition coil
32 Rear fuel injector
33 Fuel pump
35 Tachometer
44 Bank angle sensor
52, 53, 54, 55 ECM failure
56 Cam sync failure

 

[LionBuell]

I had the same problem, but driving with throttle 60%-70% open then accelerate the bike would backfire and bog down light comes on and then take off again. Take of the air box cover and lubricate the cable mentioned in the post above i think that is what solved my problem as it does not happen any more. The cable and valve gets sticky.

 

[samuelseggs]

I have this same problem. It started happening after I wrapped up my exhaust. When I read for codes. I can see any.