2006 street bob will not start no spark
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6th Gear
Joined: Aug 2018
Posts: 14
Likes: 1
From: Il
2006 street bob will not start no spark
The other day I was cleaning my bike, apparently I forgot to reconnect one of the plug wires. I cranked it over a few times before I realized it (should be no big deal) I hooked it back up and bike still wouldn't start. I let it sit overnight and put the battery on a charger, tried again the next day and still won't run. I have no check engine codes, tried 2 batteries, fuel pump is priming. I also tried 2 sets of new plugs, wires and a new coil. When checking the spark I noticed Im not getting any while the motor is cranking but when I let off the button I get one small spark. This thing has me frustrated so plz help a guy out
Road Warrior
Joined: Jul 2013
Posts: 1,649
Likes: 443
From: Indianapolis
My first thought would be to check the wiring / connection to the Crank Position sensor.
(it may take 5 seconds or more of continuous cranking to set a code for it)
Also check the wiring on the TMAP sensor (since you were cleaning maybe it was pulled loose)
Also check the Vehicle Speed Sensor connections (it uses the same 5 V reference as the TMAP and TPS)
If you leave a set of plugs in the cylinders, and connect a second set to the spark plug wires do you get spark?
(the ECM has to detect the slowing of the crankshaft under compression to sync the crank position to fire the plug)
If you have spark, check the fuel injector connections.
(it may take 5 seconds or more of continuous cranking to set a code for it)
Also check the wiring on the TMAP sensor (since you were cleaning maybe it was pulled loose)
Also check the Vehicle Speed Sensor connections (it uses the same 5 V reference as the TMAP and TPS)
If you leave a set of plugs in the cylinders, and connect a second set to the spark plug wires do you get spark?
(the ECM has to detect the slowing of the crankshaft under compression to sync the crank position to fire the plug)
If you have spark, check the fuel injector connections.
Road Warrior
Joined: Jul 2013
Posts: 1,649
Likes: 443
From: Indianapolis
Maybe if you crank it long enough.
With IGN ON and the engine stop switch at RUN, the ECM will energize the system relay to
complete the circuit to the in-tank fuel pump, ignition coils and fuel injectors. They will remain powered as long as the engine
is cranking or running, and the ECM is receiving ignition reference pulses from the CKP sensor. If there are no reference
pulses, the ECM will de-energize the system relay.
The coil receives power from the system relay at the same time that the fuel pump and injectors are activated.The system
relay is active for the first 2 seconds after the ignition switch is turned ON and then shuts off until rpm is detected from the
CKP sensor, at which time system relay is reactivated.
With IGN ON and the engine stop switch at RUN, the ECM will energize the system relay to
complete the circuit to the in-tank fuel pump, ignition coils and fuel injectors. They will remain powered as long as the engine
is cranking or running, and the ECM is receiving ignition reference pulses from the CKP sensor. If there are no reference
pulses, the ECM will de-energize the system relay.
The coil receives power from the system relay at the same time that the fuel pump and injectors are activated.The system
relay is active for the first 2 seconds after the ignition switch is turned ON and then shuts off until rpm is detected from the
CKP sensor, at which time system relay is reactivated.
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From: florida
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6th Gear
Joined: Aug 2018
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From: Il
Update
Did a compression test and found that I had no compression on the rear cylinder, pulled the head and found a bad intake valve. I'm considering going with a set of 103 screaming eagle heads. Anyone know if they'll bolt on without machining?
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Road Warrior
Joined: Nov 2005
Posts: 1,484
Likes: 82
From: Mountain View, California
I dont have an answer, but you might want to start a new thread on this.
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