'96 Road King is dieseling...
#1
08-09-2014, 02:15 PM
'96 Road King is dieseling...
Does anyone know what might be causing my bike to diesel when shutting it down? It's dieseling and sputtering. I don't think it's the RPM's being too high unless my tach is off. It's idling at, or just under 1000. It's not the fuel b/c I've used a variety of fuels and the stuff I put in it most of the time is really good fuel. I don't know if it's related or not but it seems to be backfiring out of the carb when starting it quite a bit lately too. I'm also having a harder time reaching speeds over 100 mph...actually, it's been kind of benching off at 90 or so...and it has been much harder to get from 90-100mph. Any thoughts? Thanks!
#2
08-09-2014, 02:25 PM
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Well, just thinking, when you turn off the ignition the spark plugs quit sparking but if there are large amounts of carbon in the cylinders and those deposits are hot enough to continue burning the fuel being drawn in while the engine rpms are going down. Maybe time to de-carbon the piston crowns and heads.
#3
08-09-2014, 02:49 PM
Well, just thinking, when you turn off the ignition the spark plugs quit sparking but if there are large amounts of carbon in the cylinders and those deposits are hot enough to continue burning the fuel being drawn in while the engine rpms are going down. Maybe time to de-carbon the piston crowns and heads.
Try running a tank with 8oz. of Seafoam to clean it out.
#4
08-09-2014, 02:51 PM
Ultimate HDF Member
New plugs--higher octane gas. Tuning. Missed the back firing part. Air leak at plenum.
Last edited by oldairboater; 08-10-2014 at 05:48 AM.
#5
08-09-2014, 03:57 PM
Outstanding HDF Member
Post this in the evo section, and DO not use that seafoam ****.
Backfiring through carb, and not being able to reach a certain RPM, sounds like a typical intake leak to me. The only other time it should diesel is if the timing is a lite too advanced. Higher octane wont fix anything. Check for intake leaks and report back.
Backfiring through carb, and not being able to reach a certain RPM, sounds like a typical intake leak to me. The only other time it should diesel is if the timing is a lite too advanced. Higher octane wont fix anything. Check for intake leaks and report back.
#6
08-09-2014, 06:12 PM
Post this in the evo section, and DO not use that seafoam ****.
Backfiring through carb, and not being able to reach a certain RPM, sounds like a typical intake leak to me. The only other time it should diesel is if the timing is a lite too advanced. Higher octane wont fix anything. Check for intake leaks and report back.
Backfiring through carb, and not being able to reach a certain RPM, sounds like a typical intake leak to me. The only other time it should diesel is if the timing is a lite too advanced. Higher octane wont fix anything. Check for intake leaks and report back.
What's the best way to check for intake leaks? Thanks!
#7
08-09-2014, 06:22 PM
Outstanding HDF Member
Spray WD-40 around the intake manifold where the flanges meet the heads. Try to refrain from using brake cleaner. If it smokes or starts sputtering/stumbling/RPM changes then you have an intake leak. Remove the carb and change your intake gaskets.
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#10
08-09-2014, 07:01 PM
Outstanding HDF Member