Oh Crap!! Limp Home Mode??

tdragger

Living Legend
Joined
Jul 8, 2007
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Location
Fredericksburg, VA
Arrived at a client site 60 miles from home on my 06 Std Roc this morning. Performed a slow speed right turn into a parking slot. As I got the bars to the far right stop, the engine started sputtering and idle dropped to just a couple of hundred RPMs. After rolling to a stop, it sputterred a little more and when I attempted to give it gas, it died. On restart it sputtered at a 200-300 RPM and died when I tried to give it gas.

Does this describe the "Limp Home" that the ECU will go into? If so, is it really possible to ride it home?
 
Check the electrical connections to your coils as mine ran on two cylinders intermittently for a while then all the time and then gave me the engine light you describe .Worth a look anyway ,I figure
 
That ain't limp. That's god **** help me I'm drowning in my own fluids mode! :lol:

Hard to say what it is but my guesses are bad fuel delivery (fried fuel pump, clogged fuel filter or crap in the tank), idle servo fried, TPS fried, corrupted ECU tune or fried ECU, coils like said above, maybe even bad battery connection.

I'd make sure your battery connections and connections under the tank are clean and secure first. If the bike will run of if you give the throttle some grunt then you probably have a bad idle servo. You could ride it as long as you manually keep the revs up.

The other problems are unrideable if the engine don't run right.

If you suspect crap gas, I'd put in half a bottle of SeaFoam to help clean it up or at least try some fuel dryer like HEET (isopropyl).

Keep us posted and good luck!
 
I'd be concerned with the far right stop.

Did you tweak the throttle cable and now the TPS is out of whack?
 
If it only happened when you stretched the bars to full right hand lock, are you sure its not just a connection that has pulled apart slightly?

Have you altered the handlebar set up with larger ones, or fitted risers? Something that might have stretched the wires a little too far maybe?
 
hmm... To the right would have compressed and the left side would have stretched. I can't think of anything on the left would cause low RPM.

I'm spent, throttle cable is all I've got.
 
No engine light so no ECU Code to read. Have had recently an intermittent (sp?) P0638 code which I understand has something to do with an electrical connection to "2nd Throttle Actuator Motor / wiring fault". Didn't get the code this time.

I went out at lunch and she started right up and ran fine. About 5 mins later as I was going low speed on a side street, she started running rough again. I'm starting to suspect bad gas or fuel filter since the bars were positioned for straight running. After stopping and shutting her down for a few minutes, she started up fine again.

Wondering if the ghost of Lucas Electrics is striking again...
 
The after 5 minute thing is saying TPS to me still.

When you go out and start it up, it's cold so the ECU is keeping the throttle up. Once it's warm, it stops doing that but the TPS is out of whack and the ECU thinks the throttle is in a position that it's not, causing your low RPMs and dying.

Got a TuneBoy?
 
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