No spark
Thread Starter
|
Stellar HDF Member
Joined: May 2010
Posts: 2,864
Likes: 126
From: Aussie lost in Switzerland
Reset the DTC and now im getting a P0374 code, CKP sync error.
Replaced the CKP and made no difference ........Still no spark. guess ill be chasing shorts or open wires now
So Cleared the codes again just to be certain i wasnt looking at old codes... Now i get NO codes, probly because bike isnt starting so ECM isnt collecting any info.....
Replaced the CKP and made no difference ........Still no spark. guess ill be chasing shorts or open wires now
So Cleared the codes again just to be certain i wasnt looking at old codes... Now i get NO codes, probly because bike isnt starting so ECM isnt collecting any info.....
Last edited by Krazy8s; Oct 26, 2017 at 09:49 AM. Reason: more info added.....
Thread Starter
|
Stellar HDF Member
Joined: May 2010
Posts: 2,864
Likes: 126
From: Aussie lost in Switzerland
Agreed. Thinking I have an open or short between ECM and the sensor, or between sensor and ground. Gonna get the old ohm meter out tomorrow and see if I can track it down.
Seasoned HDF Member
Joined: Jan 2015
Posts: 15,943
Likes: 7,035
From: Sandy Eggo's North County
I had the same issue many years ago. Silly as it sounds, I had installed SE plugs about 3 or 400 miles prior. No spark, but plenty of battery. Turns out it was those plugs! Went back to NGK plugs for the next 10 years and no problem.
So, change your plugs, even if they look “ perfect.”
So, change your plugs, even if they look “ perfect.”
Thread Starter
|
Stellar HDF Member
Joined: May 2010
Posts: 2,864
Likes: 126
From: Aussie lost in Switzerland
Ive been doing some trouble shooting, a process of elimination....
Still no joy finding the problem but I have a suspicion my coil is shot.....
What I do know:
The Manual page I have is from a 2003 Dyna, (kindly provided by FXD2003rider), it shows the coil schematic and testing procedure, based on this my coil FAILS. But I dont know if the coil inards are the same as for a 2010 Dyna. The 2003 diagram doesnt show an ION sense connection.
Measuring from the 12V pin to the secondary coil is a big airgap, However if i measure from the ION SENSE pin to the secondary i get 3K5ohms either side which indicates that the ION SENSE is centre tapped to the secondary coil (7kohms across whole secondary), which makes sense as it is from here that it gets resistance feed back from the spark plugs.
What I dont know for certain now, does the 12V power center tap to the secondary or not for 2010 dynas? I would have thought it would, but maybe the ION SENSE is somehow involved here beyond being a passive sensor???
The only other thing I can think of is the ECM is on the Fritz, or somehow the CKP isnt seeing the TDC mark when the motor turns. (I did briefly get a CKP SYNC ERR code at one point) Ill put an LED across it to see if I get a flash.
Off to change spark plugs now in a fit of desperation.....
Well, new spark plugs made no difference, didnt think it would but at least one more potential problem ticked off the list..
Still no joy finding the problem but I have a suspicion my coil is shot.....
What I do know:
- Connectivity from the CKP sensor back to ECM plug is Good.
- CKP Sensor is NEW so I am assuming it works.
- Connectivity from Coil connector back to ECM Plug & 12V power fuse is Good
- I get 12v at the coil connector when I crank the motor.
- On the ignition coil pins, I get good Ohm reading between 12v pin and front and rear coils
- Ignition Coil output reads 7Kohms across it.
The Manual page I have is from a 2003 Dyna, (kindly provided by FXD2003rider), it shows the coil schematic and testing procedure, based on this my coil FAILS. But I dont know if the coil inards are the same as for a 2010 Dyna. The 2003 diagram doesnt show an ION sense connection.
Measuring from the 12V pin to the secondary coil is a big airgap, However if i measure from the ION SENSE pin to the secondary i get 3K5ohms either side which indicates that the ION SENSE is centre tapped to the secondary coil (7kohms across whole secondary), which makes sense as it is from here that it gets resistance feed back from the spark plugs.
What I dont know for certain now, does the 12V power center tap to the secondary or not for 2010 dynas? I would have thought it would, but maybe the ION SENSE is somehow involved here beyond being a passive sensor???
The only other thing I can think of is the ECM is on the Fritz, or somehow the CKP isnt seeing the TDC mark when the motor turns. (I did briefly get a CKP SYNC ERR code at one point) Ill put an LED across it to see if I get a flash.
Off to change spark plugs now in a fit of desperation.....
Well, new spark plugs made no difference, didnt think it would but at least one more potential problem ticked off the list..
Last edited by Krazy8s; Oct 27, 2017 at 07:30 AM. Reason: further info
Thread Starter
|
Stellar HDF Member
Joined: May 2010
Posts: 2,864
Likes: 126
From: Aussie lost in Switzerland
Spark has returned but still no Bang......
Now I have Spark. Pulled a plug, and rested it on the engine while I cranked the motor. Spark on both leads so now I know the coil is good.
But still no bang, not even an attempt to fire. Motor just cranks as if there is no spark, or gas.....
But still no bang, not even an attempt to fire. Motor just cranks as if there is no spark, or gas.....
Last edited by Krazy8s; Oct 28, 2017 at 06:15 AM.
HD Forum Stories
The Best of Harley-Davidson for Lifelong Riders
10 Worst Harley-Davidson Motorcycles Ever
Pouria Savadkouei
Killer Custom's Jail Break Is The Breakout That Refused to Blend In
Verdad Gallardo
Crazy Bunderbike Build Looks Amazing, But Is It Impossible to Ride?
Verdad Gallardo
Harley-Davidson Reveals Super Cool Cafe Racer Concept
Verdad Gallardo
Engraved Rebellion: Inside Bundnerbike's Glam Rock II
Verdad Gallardo
10 Motorcycles You Should Never Buy
Joe Kucinski
10 Things Harley-Davidson Needs to Fix in 2026
Verdad Gallardo
Southpaw Super Glide: A Left-Hand-Drive 1979 Harley FXE Built to Fit the Rider
Verdad Gallardo
The Best and Worst Harley-Davidson Moves of 2025
Verdad Gallardo
Leave out the spark plugs, crank the engine for a minute and check if you smell gas at the plug opening to check if the injectors work as supposed...
What about the condition of fuses for the fuel pump, injectors and ecm?
Have you disconnected the ecm from the main harness and checked if there isn't any moisture in the connector?
What about the condition of fuses for the fuel pump, injectors and ecm?
Have you disconnected the ecm from the main harness and checked if there isn't any moisture in the connector?
Thread Starter
|
Stellar HDF Member
Joined: May 2010
Posts: 2,864
Likes: 126
From: Aussie lost in Switzerland
Will do the gas smell test..
All Fuses good, ECM connector clean and dry. I hear the fuel pump prime when i switch ignition on.
Im worried now that Ill be chasing around in circles looking for probs that arent there...
All Fuses good, ECM connector clean and dry. I hear the fuel pump prime when i switch ignition on.
Im worried now that Ill be chasing around in circles looking for probs that arent there...