Engine misses intermittently

if i was checking for a coil that i thaught was not firing.
i would while running pull the outside terminal (neg ecu grounding) and you should notice a big difference because it will stop that coil from firing.
 
TURBO200R4 said:
if i was checking for a coil that i thaught was not firing.
i would while running pull the outside terminal (neg ecu grounding) and you should notice a big difference because it will stop that coil from firing.
Click to expand...
good idea, that would save time, thats why i come here, learn something new everyday
 
dirtbagbiker said:
the First thing I would do is disconnect the power commander it could be going bad . Don’t ask me how I know.
Click to expand...
I inadvertently had it disconnected from the system so it wasn't powered on, and it was still happening, was worse before i remapped the main ECU and ran it, that helped, but it was still missing, before i mapped decel sounded like Rice Krispies on steriods
 
Check clean and recrimp the spade and connector on each low voltage lead to each coil if they are loose they vibrate loose contact and sporadically misfire. Number on coil is the hardest to get to. Also on a few occasions the female spade was so loose it vibrated off the coil.
Just a little squeeze with a pair of pliers and you will feel how much tighter they are when you reattach the connectors.
Number 2, and 3 coils are the easiest start there first before you dig for number 1.
Hope this helps.
 
There was some kind of cross brace for something that is in the way of number 1 coil, it seemed superfluous, so I left it off.
 
If you think it might be only 1 coil acting up, beg, borrow or steal a replacement then swap it out with each coil, taking the bike out for a test ride after each swap to see if you've found the defective one. This way, if there is a bad coil you save replacing the lot, not knowing which of the 3 was defective. I'm cheap when it comes to replacing parts in order to troubleshoot a problem.
 
You must log in or register to reply here.

Similar threads

Engine light question
2
Replies
12
Views
554
tywal
Momentary voltage drop? / check engine light
2 3
Replies
25
Views
1K
Hawk
Looking to buy a Touring, years to avoid, differences in engine output between Touring and Roadster.
2
Replies
18
Views
2K
Tripps
Struggling to figure out the cause of misfires
Replies
7
Views
662
concours
Engine warning light
7 8 9
Replies
89
Views
11K
martym52
Menu
Log in
Register