Help! NEW cold start problem - HCS Snowmobile Forums

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Old 03-12-2019, 12:38 PM   #1 (permalink)
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Default Help! NEW cold start problem

Ok just went on 4 day trip.
- Left home (4deg) started FINE, just turned key, like I've done for past 3 yrs. (200 mile day)


-Next day (-2deg), turned key, started but stumbled so I touched throttle and then stalled and wouldn't start (flooded). Dealer said I shouldn't touch throttle and suggested hold 1/2 throttle and don't let off key. Well it started and held high throttle until warm. ran great and started great all day. Thought I was all set. (300 mile day)


-3rd day, (5deg), tried to start, almost did, major back firing. Was going to have local dealer pick up but after and hour or so we got it to start. Still brought to dealer for new plugs and reflash. Dealer also said to cycle key twice and then start.


-4th day, tried 2 cycle key trick, but start great for 20 seconds and then stumbled. I finally played with throttle to keep going until warm. Fine all day with numerous starts. (made it home)

Next day at home (12deg) tried my old way to start, started but then started to stumble after 30 seconds, played with throttle and kept it going.

WHAT IS WRONG????? Asked dealer, he said probably needs valve adjustment (expensive) sled has 8300 miles. Don't want to say he is wrong, but up to 3 days before it always started fine, even in colder weather.
ANY OTHER SUGGESTIONS? Throttle adjust? Bad sensor?
2014 Yamaha Viper (all stock, original owner, always maintained well)
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Old 03-19-2019, 07:56 PM   #2 (permalink)
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Join Date: Dec 2006
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Current Sled(s): 14 Viper 19 Rush
Previous Sled(s): 1980 Polaris Centurion, 79 Kawaski Invader, 03 Viper
Location: Mass, Bridgewater
Favorite Riding Area: Andover & Rangeley Me.
18-19 Mileage 2650
17-18 Mileage: 1800
16-17 Mileage: 1476
15-16 Mileage: 1677
Age: 54
Riding Since: 1984
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Originally Posted by bcporsche View Post
Ok just went on 4 day trip.
- Left home (4deg) started FINE, just turned key, like I've done for past 3 yrs. (200 mile day)


-Next day (-2deg), turned key, started but stumbled so I touched throttle and then stalled and wouldn't start (flooded). Dealer said I shouldn't touch throttle and suggested hold 1/2 throttle and don't let off key. Well it started and held high throttle until warm. ran great and started great all day. Thought I was all set. (300 mile day)


-3rd day, (5deg), tried to start, almost did, major back firing. Was going to have local dealer pick up but after and hour or so we got it to start. Still brought to dealer for new plugs and reflash. Dealer also said to cycle key twice and then start.


-4th day, tried 2 cycle key trick, but start great for 20 seconds and then stumbled. I finally played with throttle to keep going until warm. Fine all day with numerous starts. (made it home)

Next day at home (12deg) tried my old way to start, started but then started to stumble after 30 seconds, played with throttle and kept it going.

WHAT IS WRONG????? Asked dealer, he said probably needs valve adjustment (expensive) sled has 8300 miles. Don't want to say he is wrong, but up to 3 days before it always started fine, even in colder weather.
ANY OTHER SUGGESTIONS? Throttle adjust? Bad sensor?
2014 Yamaha Viper (all stock, original owner, always maintained well)
After more investigation;
1. I turn the key it starts fine and idles normal
2. It idles for 10 seconds normal then begins to idle lower until it stalls
3. Will now not start without giving it gas
4. It will start and idle really rough almost like it's running on 2 cylinders
5. It will only stay running if I keep the rpm over 3000
6. If keep the rpm over 3000 until the coolant temp is over 70 it will now idle normal
7. If I drive it after it's warmed up it drives normal
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Old 03-19-2019, 08:13 PM   #3 (permalink)
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Default

do these have Idle Speed Valves? Sure sounds like an issue with one...but one needs diagnostic equipment( software/hardware to watch sensors live / fuel psi checker / spark strength checker / etc) to zero in on the problem like coolant temp sensor and other common problems.
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Old 03-19-2019, 09:33 PM   #4 (permalink)
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@bcporsche Maybe its the ISC relay that is sticking try one of the other relays from headlight/taillight easy thing to try.
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Old 03-24-2019, 08:17 PM   #5 (permalink)
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Current Sled(s): 14 Viper 19 Rush
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Location: Mass, Bridgewater
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16-17 Mileage: 1476
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@bcporsche Maybe its the ISC relay that is sticking try one of the other relays from headlight/taillight easy thing to try.
I tried switching relays and Unhooking battery with key on trick. Still the same. I guess its valve adjustment time as dealer suggested
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Old 03-26-2019, 02:00 PM   #6 (permalink)
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I think paying to have the valves adjusted would be a waste of money. It is something electrical or fuel related. It would not run fine when warm if the valves were out of adjustment. Check the compression. If it is normal it is not the valves.
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Old 03-26-2019, 02:45 PM   #7 (permalink)
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Out of spec valves usually show as hot start issues.
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Old 03-26-2019, 04:11 PM   #8 (permalink)
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did you replace the OEM NON sealed relays with sealed one's?? if not I would start there!
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Old 03-26-2019, 04:19 PM   #9 (permalink)
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Current Sled(s): 14 Viper 19 Rush
Previous Sled(s): 1980 Polaris Centurion, 79 Kawaski Invader, 03 Viper
Location: Mass, Bridgewater
Favorite Riding Area: Andover & Rangeley Me.
18-19 Mileage 2650
17-18 Mileage: 1800
16-17 Mileage: 1476
15-16 Mileage: 1677
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Originally Posted by fastcat800 View Post
I think paying to have the valves adjusted would be a waste of money. It is something electrical or fuel related. It would not run fine when warm if the valves were out of adjustment. Check the compression. If it is normal it is not the valves.

I agree, the problem started just out of the blue. (see my post)

Dealer is adamant that its a valve adjustment, wont even entertain other ideas.
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Old 03-26-2019, 04:24 PM   #10 (permalink)
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Current Sled(s): 14 Viper 19 Rush
Previous Sled(s): 1980 Polaris Centurion, 79 Kawaski Invader, 03 Viper
Location: Mass, Bridgewater
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18-19 Mileage 2650
17-18 Mileage: 1800
16-17 Mileage: 1476
15-16 Mileage: 1677
Age: 54
Riding Since: 1984
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Originally Posted by mrbb View Post
did you replace the OEM NON sealed relays with sealed one's?? if not I would start there!

I switched IEC relay as someone mentioned, no change. I don't think its a relay issue. (I've seen those problems in wifes Vector) But my Viper starts for 10 seconds then after 10 seconds idle drops and stalls. When trying to re start you hear fuel pump and popping. Like its flooded or something. Once over 90 on engine temp, starts and idles fine. MAYBE AND IDLE CONTROL UNIT?
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