Running issue (reposting)

Brad

Norsebiker
Joined
Oct 6, 2013
Messages
12
Location
Livermore, Ca
Ride
2008 Rocket III Tourer
Hey all,

Posted this in the R3T section, but probably should be here.

I have been having an issue for about a week now that I am having trouble diagnosing.

Current info;
2008 R3T
30,000 miles on it
Stock exhaust, K&N air filter, Power-Tripp's advised tune for stock R3T's.
Checked all connections and vacuum ports/hoses/connections.

Before installing the new tune the bike would (at full operating temp) occasionally loose power when at freeway speeds when either A) holding steady throttle on a down hill incline, or B) when holding a steady throttle on nearly flat ground. (in and around 65-75 mph)

Now with the new tune that all has moved down to around 45-55 mph and has become much more pronounced.
It almost feels like the bike is momentarily starving for fuel.

As stated before; yes I am a former Triumph mechanic. These days I am completely out of that business. So I don't have the connections and contacts at Triumph anymore. Sadly including the Triumph diagnostic software.

My guess is that one of the sensors (TPS or temp) might be going.

Any and all help would be greatly appreciated.
 
I don't really know but it could be one the sensors. Is the air temp one sitting where it should be? I guess it could have been dislodged and sitting somewhere that heats up. If it wasn't working I'm not sure the effect would be as dramatic as described. I have no experience with a dud TPS but I know they can cause these sort of problems.
 
Not that I can hep you much but....when you lose power is it like hitting the kill switch, or if you keep the same power setting will the engine come to life again at a certain RPM(need more detail)
 
Pull tank and check fuel filter and fuel pump setup... I had similar issues once due to bad fuel clogging filter... Went away after replacement. Might not be your exact problem but a good start. Also check coil wiring and make sure the are clean and tight fit.
 
On some bike forums different motorcycles that have a similar problem are caused by fuel starvation. One solution has been to crack open the fuel cap to see if the air inlet is blocked. Don't remember rockets having that issue but several others have.
 
sometimes if you have a good empty road you can run it up in rpm through the first three gears, usually if it just runs out of gas you have a fuel problem.
when it is acting up try shifting a down gear and try to hold same speed to see what happens.
 
If you get some fuel with water in it, and the water fills up the fuel filter; it'll starve out like that, too.

I've had it happen with boats and jet skis.
 
My money is on the primary TPS. Before you change it check your low tension coil leads clean grease and recrimp the leads as they vibrate loose. Lubricate the throttle bodie linkage including beteen the throttle bodies. The do a full ISCV reset which will alow you to adjust the TPS if needed along with the stepper motor. Once this is doen see if its still there and if it moved any. If it still does it or moved a little and you move the TPS any I am betting on a flat spot on the rehostat in the TPS which is not giving a good voltage signal.
 
Last edited:
kmrmike said:
Not that I can hep you much but....when you lose power is it like hitting the kill switch, or if you keep the same power setting will the engine come to life again at a certain RPM(need more detail)
Click to expand...
I went through the same problem like riding a wild bull bucking popping stalling and running lean.
After a bunch of work it ended up that the ethanol destroyed my fuel pump including the baffle and filter but the main problem was my pressure regulator which is part of the whole fiuel pump assembly.
Easy to replace and the parts are not too expensive. Mine is a 2008 r3t with 6000 miles sat too long with the ethanol added gas here in the USA (bad stuff for euro bikes)
I had pretty much a whole team of Triumph techs go through the entire bikes ecu, fuel, exhaust, ignition....
Runs perfect now
 
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