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Thread: Idle surging

Created on: 07/11/19 09:44 AM

Replies: 5

Flyboy


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Joined: 04/12/19

Posts: 11

Idle surging
07/11/19 9:44 AM

I bought my 2015 14R a few months ago and put about a 1,000 miles on it so far. The bike always had a lopey idle, like a car with a big cam sounds. It eased up when warm and usually holds between 1050 and 1100 rpm's. The other day I went out and the idle surge seemed stronger than usual. At the first stop light the engine cut out. It restarted fine but the surging continues. Perhaps it could be as simple as a bad tank of gas but was wondering what else could cause this change? From what I understand the bike has a PCV installed. I have no info on mapping, if their was an ECU flash or fly removal. If this continues after a fresh tank of gas is this something a dealer can troubleshoot given the modifications? It also has a full Brocks system. Not concerned about warranty issues but more about someone being able to review what is there (or not) and figure this out. Thanks.


* Last updated by: Flyboy on 7/11/2019 @ 9:45 AM *

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Grn14


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Location: Montana

Joined: 02/25/09

Posts: 14361

RE: Idle surging
07/11/19 11:25 AM

fueling.It shouldn't be doing that.Especially to the point of stalling.What does it do if you're getting on it and then suddenly chop throttle?Can you try some fuel injector cleaner in it?See what that does.disconnect the pcv.Try that.See if it's okay then.Then you'll know for sure.About that anyway.


* Last updated by: Grn14 on 7/11/2019 @ 11:28 AM *

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Flyboy


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Joined: 04/12/19

Posts: 11

RE: Idle surging
07/11/19 12:13 PM

Grn- Bike runs strong other than the idle. If I step on it and let off the throttle I get an occasional backfire but that's mostly the Brocks I think. I'm sure I can figure out how to disconnect the pcv but do I risk a lean situation with the stock fuel flows and the Brocks system?

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suzy1052


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Joined: 03/19/15

Posts: 117

RE: Idle surging
07/11/19 5:24 PM

You'll be fine. These bikes are rich straight off the showroom floor. Mine ( ECU tuned/full ex. ) will surge slightly on hot days after riding steady state on the interstate and then stopping at a light. After a few moments it settles down. I would say the PCV likely needs a little tweaking. I doubt anyone removed the flies on a 2nd gen as it wasn't needed like the Gen 1. Really miss my 84 zx900 after looking at your avatar.


* Last updated by: suzy1052 on 7/11/2019 @ 5:26 PM *



1982 XS400
1983 GS550E
1984 ZX900
1985 ZX900
1989 ZX-10
1992 1100 Katana
1993 ZX-11
1996 ZX-11
2000 R1
2001 R1
2002 Hayabusa
2003 ZX-12R
2006 ZX-14
2016 ZX14R SE

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Flyboy


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Joined: 04/12/19

Posts: 11

RE: Idle surging
07/11/19 5:45 PM

Suzy- I had the 84 GPZ900 as well hence my long search to find this model.

I did find out that the ecu wasn’t messed with so will find someone to tweak the PCV.

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Danno


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Location:

Southwestern Illinois

Joined: 12/18/11

Posts: 2074

RE: Idle surging
07/13/19 5:54 AM

These bikes are rich straight off the showroom floor. -Suzy1052

Never heard this before about any stock bike made since about 1980.

The ECU enrichens the mixture for cold starting and leans it back out as the engine warms. EFI enrichens when the engine is hot, the opposite of carbed machines which lean out when hot.

A lopey idle would have me looking for an air leak. As it sucks air, the sensors will tell the injectors to add fuel to compensate, raising the idle speed. Then it will compensate the other way, dropping the idle speed.



'07 CPB Blue; ZGST windscreen with MRA X-screen adjustable spoiler, tube bar adaptor, PC III, ATRE,BMC air filter, modified stock seat with 2nd Look cover,Scorpion Flame Ti slip-ons, Galfer rotors front and rear, braided-stainless lines, C-F 10R front fender, C-F hugger, C-F inner fairing panels, painted foreman's fins with faux C-F inlay, polished rim lips wired for heated gear and accessories, Givi V35 side bags and E41 topcase with SW-Motech qd mounts

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