Stalls while decelerating

mckayprod · 03-10-2016, 12:17 AM

I'm going through the Delphi Fuel Injection troubleshooting guide (thanks, Spud) because my bike stalls when I back off on the gas, usually coasting to a stop, usually on a cool night. Next step is, according to the sticky, check the wiring and connectors to the MAP/MAT sensor. Where, exactly, is that? It's gotta be somewhere between the airbox and the cylinder, but I get lost without a carburetor.

Thanks in advance!

Jay In Milpitas · 03-10-2016, 12:52 AM

http://www.rx3forums.com/forums/show...ll=1#post40392

Hope this link opens for you. One Allen screw holds it in. It's on the right side of the intake manifold.

mckayprod · 03-10-2016, 12:56 AM

I'll try the contact cleaner treatment in the morning. Thanks!

SpudRider · 03-10-2016, 03:16 AM

Engine Stalling While Decelerating

Check the battery voltage. Check electrical connections to the MAP/MAT sensor, idle stepper motor, and throttle position sensor. Verify the emission canister purge valve is functioning correctly. Check both of the purge valve hoses for leaks. Check the intake manifold and throttle body for air leaks.

Connect the EFI scan tool/computer, and check for diagnostic trouble codes (DTC).

Check the valve lash.

Clean the throttle body and idle stepper motor with brake cleaner. Clean the MAP/MAT sensor.

If you tried all the previous steps, and cleaning the MAT/MAP sensor doesn't fix the problem, you can also try using a higher octane fuel.

If higher octane fuel doesn't help, give Gerry a call at CSC. He can help you to verify the optimum alignment of the throttle position sensor.

kohburn · 03-10-2016, 08:25 AM

this sounds familiar, I feel like someone else had the same or similar problem last year and eventually part swapping found the problem and fixed it.

SpudRider · 03-10-2016, 11:40 AM

Quote:

Originally Posted by kohburn

this sounds familiar, I feel like someone else had the same or similar problem last year and eventually part swapping found the problem and fixed it.

You are correct. Fishman10 had this problem.

Gerry determined the main problem was excessive valve lash. The valve tappets had been adjusted on the exhaust stroke, instead of the compression stroke. To avoid this problem, remove the cam inspection ports, and align the marks on the cam sprocket with the marks on the inspection ports.

After addressing this problem, Gerry also found a little slop in the alignment of the throttle position sensor. If all else fails, I would call Gerry, and he will describe how to diagnose, and fix this potential problem.

mckayprod · 03-10-2016, 11:09 PM

I'm working through all thes steps as best I can. I think I can call Jerry tomorrow and see what the next steps are. I don't think the valves are mis-set...the bike runs fine otherwise and the stalling predates my own valve adjustment. Thanks for the help!

RedHawk47 · 03-11-2016, 11:11 AM

I had stalling when decelerating problem with my F800GS. After changing out everything else they finally put in a new fuel pump and the problem went away.

mckayprod · 04-27-2016, 12:34 AM

Alright, here's the latest: I reset the valves at 2500 miles, and tried to adjust them to the loose side of the range. Voila, no more stalling! It's been a couple of weeks since I did the work, and I didn't want to post until I'd given it a few miles in different conditions, but this seems solid. Not only doesn't the bike stall, but I picked up a couple of mpg in the bargain...now 58 from 56. I'm happy. Hope I can do it again next time.

SpudRider · 04-27-2016, 12:50 AM

Thanks for posting the update; I'm glad you resolved the problem.

Indeed, it is better to set the valve clearance a little too loose, rather than a little too tight.

03-10-2016, 12:17 AM	#1
mckayprod Join Date: Oct 2015 Location: Dixon, CA Posts: 75	Stalls while decelerating I'm going through the Delphi Fuel Injection troubleshooting guide (thanks, Spud) because my bike stalls when I back off on the gas, usually coasting to a stop, usually on a cool night. Next step is, according to the sticky, check the wiring and connectors to the MAP/MAT sensor. Where, exactly, is that? It's gotta be somewhere between the airbox and the cylinder, but I get lost without a carburetor. Thanks in advance!
	0

03-10-2016, 03:16 AM	#4
SpudRider Join Date: Jul 2008 Location: Idaho Posts: 25,054	Engine Stalling While Decelerating Check the battery voltage. Check electrical connections to the MAP/MAT sensor, idle stepper motor, and throttle position sensor. Verify the emission canister purge valve is functioning correctly. Check both of the purge valve hoses for leaks. Check the intake manifold and throttle body for air leaks. Connect the EFI scan tool/computer, and check for diagnostic trouble codes (DTC). Check the valve lash. Clean the throttle body and idle stepper motor with brake cleaner. Clean the MAP/MAT sensor. If you tried all the previous steps, and cleaning the MAT/MAP sensor doesn't fix the problem, you can also try using a higher octane fuel. If higher octane fuel doesn't help, give Gerry a call at CSC. He can help you to verify the optimum alignment of the throttle position sensor. __________________ Spud "Never argue with an idiot. He will drag you down to his level, and beat you with experience." Mark Twain 2015 Zongshen ZS250GY-3 (RX3) 2006 Zongshen ZS200GY-2 (Sierra 200) 2005 Honda XR650L 2004 Honda CRF250X 1998 Kawasaki KDX220 Mods made to my Zongshen ZS200GY-2: http://www.chinariders.net/showthread.php?t=6894
	0

03-10-2016, 08:25 AM	#5
kohburn Join Date: Dec 2015 Location: Coastal NC Posts: 537	this sounds familiar, I feel like someone else had the same or similar problem last year and eventually part swapping found the problem and fixed it. __________________ -whatever you do, just be awesome. - 2008 Kawasaki Versys - 2016 CSC TT250
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03-11-2016, 11:11 AM	#8
RedHawk47 Join Date: Oct 2015 Location: Berthoud, CO Posts: 205	I had stalling when decelerating problem with my F800GS. After changing out everything else they finally put in a new fuel pump and the problem went away. __________________ Dan CSC RX3 Cyclone, CSC TT250, Moto Guzzi V7 II, KLR650
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04-27-2016, 12:50 AM	#10
SpudRider Join Date: Jul 2008 Location: Idaho Posts: 25,054	Thanks for posting the update; I'm glad you resolved the problem. Indeed, it is better to set the valve clearance a little too loose, rather than a little too tight. __________________ Spud "Never argue with an idiot. He will drag you down to his level, and beat you with experience." Mark Twain 2015 Zongshen ZS250GY-3 (RX3) 2006 Zongshen ZS200GY-2 (Sierra 200) 2005 Honda XR650L 2004 Honda CRF250X 1998 Kawasaki KDX220 Mods made to my Zongshen ZS200GY-2: http://www.chinariders.net/showthread.php?t=6894
	0

03-10-2016, 12:52 AM	#2
Jay In Milpitas Join Date: Jul 2015 Location: Milpitas, CA. USA Posts: 775	http://www.rx3forums.com/forums/show...ll=1#post40392 Hope this link opens for you. One Allen screw holds it in. It's on the right side of the intake manifold.
	1

03-10-2016, 12:56 AM	#3
mckayprod Join Date: Oct 2015 Location: Dixon, CA Posts: 75	I'll try the contact cleaner treatment in the morning. Thanks!
	0

03-10-2016, 11:09 PM	#7
mckayprod Join Date: Oct 2015 Location: Dixon, CA Posts: 75	I'm working through all thes steps as best I can. I think I can call Jerry tomorrow and see what the next steps are. I don't think the valves are mis-set...the bike runs fine otherwise and the stalling predates my own valve adjustment. Thanks for the help!
	0

04-27-2016, 12:34 AM	#9
mckayprod Join Date: Oct 2015 Location: Dixon, CA Posts: 75	Alright, here's the latest: I reset the valves at 2500 miles, and tried to adjust them to the loose side of the range. Voila, no more stalling! It's been a couple of weeks since I did the work, and I didn't want to post until I'd given it a few miles in different conditions, but this seems solid. Not only doesn't the bike stall, but I picked up a couple of mpg in the bargain...now 58 from 56. I'm happy. Hope I can do it again next time.
	2