Bucking in first gear

bwalsh22 · 06-06-2008, 01:54 PM

I had a similar problem with my Dyna, actually broke down on me twice. I got it to Harley the 2nd time and turned out to be the ECM, which was all covered under warranty. Any Check Engine light coming? I had that as well.

glider · 06-06-2008, 03:48 PM

I doubt it's the transmission, it's probably either fuel or ignition. Did you recently get fuel before this problem started?

Doc 1 · 06-06-2008, 04:53 PM

Quote:

Originally Posted by 6Stringer

Not sure if this is the correct forum because I don't know if this is a transmission, electrical, or other issue. I have a 2007 Heritage Softail with PC III, K&N, Rush 2.0's and 5125 miles. Bike ran perfect since the upgrade in March. Last night after about an hour and a half of riding, the bike started bucking in first gear when pulling out from red lights. I accelerate for about 15 or 20 feet, lose forward momentum, then it kicks in again and lurches forward like it either slips out of gear and back in or the fuel got pinched off then flows again. Also, when keeping the throttle steady in second or third gear, I feel little surges like I'm gently rocking the throttle but I'm not. Just bearly made it home when it was bucking in first gear up my steep driveway, then conked out. It starts right back up but I don't want to take it out in my hilly neighborhood for fear I'll never get it back home. Has anyone else experienced this or have any ideas what the issue could be?

Unplug the PCIII and try it again...if the problem goes away it's in the PCIII if not it very well could be the ECM.

glider · 06-06-2008, 07:05 PM

Do as Doc 1 suggested. There have been some PC III's going bad recently, worth a try.

cdn-bigfoot · 06-07-2008, 02:28 AM

I had a scooter did this when the mixture wasn't quite right.
Yeah a 50cc scooter with a mikuni carb. It's called "bogging".

I would say it's probably a little rich. Especially at lower rpm's.
Get your PCM checked.
Worth replacing your fuel filter as well.

6Stringer · 06-19-2008, 01:43 AM

It turned out to be a bad PCIII. The dealer put it on the dyno and let it run until it started bucking and lurching after 40 miles. They swapped out the PCIII for a new one, and let it run for 100 miles and no more problem. I just took it out for 2 hours and it ran perfectly and there was no more popping on decel which was happening a lot lately. It even starts quicker. When I called Dynojet the other day and asked if they were getting calls about this problem, they said no. If you've been heaing about bad PCIII's, they'er either lying or in a state of denial.

Fisher · 06-19-2008, 08:50 AM

They have an issue with compatability.They also refuse to admit there's a problem when the building is on fire.

06-06-2008, 01:54 PM	#1 (permalink)
bwalsh22 Play The Throttle Ride: 2006 FXDBI Street Bob Join Date: 2008, May 15 Location: Easton, PA Posts: 177 My Mood:	Re: Bucking in first gear I had a similar problem with my Dyna, actually broke down on me twice. I got it to Harley the 2nd time and turned out to be the ECM, which was all covered under warranty. Any Check Engine light coming? I had that as well.

06-06-2008, 03:48 PM	#2 (permalink)
glider Community Liaison Ride: 07 Road King Classic Join Date: 2007, Jun 21 Posts: 10,315 My Mood:	Re: Bucking in first gear I doubt it's the transmission, it's probably either fuel or ignition. Did you recently get fuel before this problem started? __________________ Psssst! Please stop by the "self help section" for maintenance tips, diagnostic codes and much more. click me!>>Self Help Information and Tips<< click me!

06-06-2008, 07:05 PM	#4 (permalink)
glider Community Liaison Ride: 07 Road King Classic Join Date: 2007, Jun 21 Posts: 10,315 My Mood:	Re: Bucking in first gear Do as Doc 1 suggested. There have been some PC III's going bad recently, worth a try. __________________ Psssst! Please stop by the "self help section" for maintenance tips, diagnostic codes and much more. click me!>>Self Help Information and Tips<< click me!

06-07-2008, 02:28 AM	#5 (permalink)
cdn-bigfoot Play The Throttle Ride: 2006 Dyna Street Bob Join Date: 2008, Mar 09 Location: I am CANADIAN Posts: 185	Re: Bucking in first gear I had a scooter did this when the mixture wasn't quite right. Yeah a 50cc scooter with a mikuni carb. It's called "bogging". I would say it's probably a little rich. Especially at lower rpm's. Get your PCM checked. Worth replacing your fuel filter as well. __________________ ...let em hear you comin'.

06-19-2008, 01:43 AM	#6 (permalink)
6Stringer Start The Engine Ride: 2007 Heritage Softail Classic Join Date: 2008, Jan 27 Location: Pittsburgh, PA Posts: 10 My Mood:	Re: Bucking in first gear It turned out to be a bad PCIII. The dealer put it on the dyno and let it run until it started bucking and lurching after 40 miles. They swapped out the PCIII for a new one, and let it run for 100 miles and no more problem. I just took it out for 2 hours and it ran perfectly and there was no more popping on decel which was happening a lot lately. It even starts quicker. When I called Dynojet the other day and asked if they were getting calls about this problem, they said no. If you've been heaing about bad PCIII's, they'er either lying or in a state of denial.

Digg this Post to del.icio.us Newsvine Yahoo Bookmarks Technorati Google Bookmarks Facebook StumbleUpon Live Bookmarks What is this?
	Thread Tools	Display Modes

06-19-2008, 08:50 AM	#7 (permalink)
Fisher Community Star Ride: 1981 FLH Shovel Join Date: 2008, Apr 21 Location: Maryland Posts: 354	Re: Bucking in first gear They have an issue with compatability.They also refuse to admit there's a problem when the building is on fire. __________________ Go out on a limb,that's where the fruit is anyway.........

Thread Tools
Show Printable Version Email this Page
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode

Bucking in first gear

Transmission