09 700 won't start! H E L P! - Yamaha Rhino Forum - Rhino Forums.net
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post #1 of 12 (permalink) Old 10-06-2016, 08:03 AM Thread Starter
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09 700 won't start! H E L P!

Hey guys,
First off I have a 2009 Rhino 700. It has dual muzzy exhaust and MSD charge fi. This summer, I started having trouble with getting my Rhino to crank. It seemed like there was an issue with fuel delivery as in a clogged filter or pump going out. It would be hard to start but would run once it started. It progressively got harder to start. Fast forward to now, I've pulled fuel pump, checked all wiring to fuel pump, and am getting fuel to the rail when the key is turned on and it primes correctly. If it sits for an extended amount of time (several days) It will crank and start but only run for 5-10 seconds before killing and not starting again.

From my research, first thought is Lean Angle Sensor. Although it hasn't been flipped or even close to it. I'm guessing corrosion/moisture in sensor.
Do y'all have any other thoughts or ideas?
I'm baffled at this point.
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post #2 of 12 (permalink) Old 10-06-2016, 08:24 AM
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My guess too is the sensor. They go bad on occasion and that is the symptom of that. If I think of anything else I'll let you know.
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post #3 of 12 (permalink) Old 10-06-2016, 08:26 AM Thread Starter
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Thanks, I HOPE it's that easy. But would the fuel pump prime when the key is turned on if the sensor was showing a roll over?


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post #4 of 12 (permalink) Old 10-06-2016, 08:49 AM
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I think so, but I'm not certain. We had that issue before and it would start fine, but only run for like 2 seconds.
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post #5 of 12 (permalink) Old 10-06-2016, 09:08 AM Thread Starter
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Thanks! I'll tackle that first when I can get back to it.


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post #6 of 12 (permalink) Old 10-13-2016, 06:44 PM
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have you tried the diagnostics on your dash? there is a reading for what the angle sensor is reading.
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post #7 of 12 (permalink) Old 10-14-2016, 10:16 AM Thread Starter
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Quote:
Originally Posted by woody24 View Post
have you tried the diagnostics on your dash? there is a reading for what the angle sensor is reading.


No I haven't gotten to check anything yet. It's 2 hours away and I won't be able to get to it until next weekend 10/22.


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post #8 of 12 (permalink) Old 05-09-2019, 01:38 PM
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Exact issue I'm having with the exact same setup (MSD and Muzzy). I have no codes, 48 psi fuel pressure, all actuator tests are fine. Hard to start when cold. Once running, smooth idle for a few minutes then progressively rougher until it dies; as if it ran out of fuel. After it dies, it's very difficult to start again and backfires occasionally while cranking. Does the same with the MSD removed so I know that's not it. I've removed the fuel pump and the pickup screen was clean so I know that's not it (also saw a volume test on another site and it passed that with flying colors). I'm at my wits end. The machine was running like a champ. Parked it and the next time I used it, this. I can't help but believe it's something simple but can't find a solution. I know I'm not the Lone Ranger since I've seen the same issue described many times but nobody ever posts their final resolution. Sure would like to sort this thing out. Thanks in advance.
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post #9 of 12 (permalink) Old 05-09-2019, 04:43 PM
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Welcome to the site, I've never owned a 700 just wondering if fuel filter is dirty or the fuel pump is starting to fail.

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post #10 of 12 (permalink) Old 05-09-2019, 06:13 PM
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09 700 won't start! H E L P!

Only time my 700 gets hard to start is when airfilter gets dirty. I also have the muzzys and msd, with cam, bored throttle body, and efi intake. Have u check ur throttle position sensor numbers
Also make sure the idle control unit is cleen inside

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09 700 4seater, Nflow remanned motor with reverse upgrade, web cam, boared throttle body, duel muzzys with spark arrestors, MSDfuel controller. JBS Extreme2 sheave, SDR full radius cage, SDR doors, SDR long travel with summer brothers axles, Fox remote resi shocks with clickers on rears.

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post #11 of 12 (permalink) Old 05-10-2019, 04:35 AM
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Quote:
Originally Posted by Brian Lee Rhino450 View Post
Only time my 700 gets hard to start is when airfilter gets dirty. I also have the muzzys and msd, with cam, bored throttle body, and efi intake. Have u check ur throttle position sensor numbers
Also make sure the idle control unit is cleen inside

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TPS numbers are good; 16 at idle, 94 WOT (I know, it's supposed to be 95 - 100 but 1 notch doesn't mean it's bad; probably fix that with adjusting the cable). The ISC was replaced (Yamaha doesn't sell it separately but the Suzuki King Quad uses the same one and they sell it). The only thing I haven't done, and I just saw this for the first time yesterday, is to try to remove the IAC and plug the hole. Air cleaner is clean. 4.0 on the lean angle sensor so I know that's working as well. I'm going to kick myself in azz if it's the IAC.
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post #12 of 12 (permalink) Old Yesterday, 08:59 AM
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Almost embarrassed to say so but since I complained that nobody ever posts about their final resolution, got to put my money where my mouth is. After all the hours I've put in trying to track this gremlin down, it ended up being the spark plug. For giggles, due to a post on another thread, I cleaned my air filter (which was no worse than I've ever seen it) and purchased a new spark plug. Replaced the filter after cleaning and installed the new spark plug then hit the starter. Runs like a champ. Took a hard look at the old spark plug and there was a fine crack in the insulator. My guess is what was happening was as the plug warmed up, the gap opened on the cracked insulator allowing the voltage to leak out, which would explain why it would run fine then run rougher and rougher until dying, like it ran out of fuel. It was really running out of spark. Crazy. I'm going to be sure to always have a spare plug on board. I am thankful I had the tools to check the other systems so I didn't replace a bunch of parts that were perfectly fine. As the old saying goes, start with the cheapest solution and work from there.
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