2009 ST1300 Police
Cranks over like a champ but won't fire
Six weeks ago on a hot day after 200 miles the bike would turn over fine after stopping, but would not start. After fiddling with switches and gas cap it would fire right up after a few minutes over the course of the next 150 miles. Started fine when cold or on short trips the next few days but eventually refused to start. Checked for spark and found none as well as no fuel on the removed plugs. Fuel pump relay kicks in but hard to tell if there was audiable evedience of pump pressurization. Larry and I stripped the plastics and found the bolt loose and slight corrosion on the green ground wires to the frame under the seat, left side. The yellow 12 ground connector as well as the 24 multi connector looked good, we had power to the fuel pump and the bike started and ran well for two weeks.
After a five hour cool down 70 miles from home the bike again refused to start but still turned over well. Eventually getting it started, it cut out completely while in motion, but would restart while drifting to the side of the road and turning off the ignition (key) and back on. It did this 6-7 times until refusing to start 1/4 mile from home. Again we stripped the plastics and looked closer at the wiring to find the wires to the right knock and neutral sensor brittle, missing sheathing, and connectors partially broken. Replacing the subharnes we found the front oil pressure switch wire sheathing chewed by rodents all the way around exposing 1/2" wire on each. Checked and cleaned all the connectors on both sides as well as the cut off switch on the bars. The bike started and ran fine for a few hours of cone practice, but again refused to start after stopping for dinner, yet still turned over like a champ.
So....tomorrow I plan on removing the rear plastics to check the ECM pins as well as other rearward connectors. Will also check for fuel pump power as well as spark. Other than a chaffed main harness, the only other possibilities I can think that would allow strong cranking yet no firering are a failing ECM, bank over or crank position sensor. No other anomalies and no codes are being thrown that I know of. Accessories include a gps, on board volt meter, Clearwater lights, police lights front and rear on isolated power and relays, heated gear harness, quarterlet harness triggering the Clearwater relay and powering the volt meter and gps. Apologies for the lengthy post.
Open to any and all suggestions and responses. Thanks, Roger
Cranks over like a champ but won't fire
Six weeks ago on a hot day after 200 miles the bike would turn over fine after stopping, but would not start. After fiddling with switches and gas cap it would fire right up after a few minutes over the course of the next 150 miles. Started fine when cold or on short trips the next few days but eventually refused to start. Checked for spark and found none as well as no fuel on the removed plugs. Fuel pump relay kicks in but hard to tell if there was audiable evedience of pump pressurization. Larry and I stripped the plastics and found the bolt loose and slight corrosion on the green ground wires to the frame under the seat, left side. The yellow 12 ground connector as well as the 24 multi connector looked good, we had power to the fuel pump and the bike started and ran well for two weeks.
After a five hour cool down 70 miles from home the bike again refused to start but still turned over well. Eventually getting it started, it cut out completely while in motion, but would restart while drifting to the side of the road and turning off the ignition (key) and back on. It did this 6-7 times until refusing to start 1/4 mile from home. Again we stripped the plastics and looked closer at the wiring to find the wires to the right knock and neutral sensor brittle, missing sheathing, and connectors partially broken. Replacing the subharnes we found the front oil pressure switch wire sheathing chewed by rodents all the way around exposing 1/2" wire on each. Checked and cleaned all the connectors on both sides as well as the cut off switch on the bars. The bike started and ran fine for a few hours of cone practice, but again refused to start after stopping for dinner, yet still turned over like a champ.
So....tomorrow I plan on removing the rear plastics to check the ECM pins as well as other rearward connectors. Will also check for fuel pump power as well as spark. Other than a chaffed main harness, the only other possibilities I can think that would allow strong cranking yet no firering are a failing ECM, bank over or crank position sensor. No other anomalies and no codes are being thrown that I know of. Accessories include a gps, on board volt meter, Clearwater lights, police lights front and rear on isolated power and relays, heated gear harness, quarterlet harness triggering the Clearwater relay and powering the volt meter and gps. Apologies for the lengthy post.
Open to any and all suggestions and responses. Thanks, Roger