2016 Mud Pro 1000 Rough Idle

monsterf7 · 2023-05-08

Hello All, I recently bought a "used" Mud Pro 1000 SE with 426 miles on it. When I went and looked at the machine the prrevious owner said that it's rough idle was probably because of "old gas". When I start the machine it fires right up perfectly. After about 5-10 seconds once the idle lowers it starts to drop in RPM, and then die. If you rev the machine or drive it it runs perfectly. I recently just changed the oil, and put fresh plugs in it. I also syphoned all of the old fuel, put it fresh 87, and added a bottle of amsoil quickshot. No improvements. It's kind of annoying me as my 2009 550 H1 idles and drives like a dream. I checked all electrical connections and everything looks perfect. The machine is very clean and has hardly been ridden. Since I drained the old fuel I only road the machine around my house a few times. Maybe the old fuel hasn't been 100% used out of the tank? Any help is appreciated. I tried searching on this forum and google and haven't found any better suggestions than what I already attempted doing. Thanks in advance, Ray

doorfx

· #2 · 20 d ago

Check your TPS

2013 700 XT TRV EPS :
28" Bighorns on bed linered 08 Prowler rims , Wireless winch remote, 3000LB. Warn winch, Heated front and rear grips, Cat relay wiring harness for accessories, LED light bar, 08 650 trv LTD rear box, Heated rear seat, Elka stage 3 shocks all 4 corners, Aftermarket A-arm bushings, aftermarket sway bar bushings(prototype), Deluxe brush guard bumpers front and rear, Red anodized Hause fairlead, beverage opener winch hook, Synthetic winch rope, RTR motor mount bushings, Dynojet PC5 programmer, Dynojet Autotune, [/B]

07 500 Gone but not forgotten;
Dynojet/142m/45p/3rd/3turns--Clipped and drilled--Unifilter--Easy adjust PMS--L.C.V. mod--AC Swaybar--Exhaust mod--2"Snorkels--Sanny shock bushings-- Airdam stage 1--PSC phase 2--21/ 23gr rollers--Dalton yellow spring--.7mm shim--Sanny Steerlites--RTR Flex Bracket--2 up seat / pegs--Tach--AC handguards--28" Outlaw mst's--Skull tailight--Skull shifter--Self Resetting Breakers--1" Wheel spacers--Customcncparts Steering Damper--AC deluxe handwarmers--6000k HID'S hi/lo--AC Deluxe Bumpers--Inline Fuel Filter-- O2 sensor \AFR guage--Black Magic Full Stainless Exhaust System--Wireless Winch Remote--29.5 Outlaws--Fox Podium X Rear Shocks--

It's mind over matter,If you don't mind,
It just doesn't matterCat happy

No Boost No Bottle
just balls and throttle

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monsterf7

Discussion Starter · #3 · 18 d ago

doorfx said:
Check your TPS

I purchased the TPS tool, took off the front plastics, got to the TPS, sensor reads 0.63 at idle (service manual says 0.58-0.62). I adjusted it to 0.59 and it’s doing the exact same thing.

Any other tips? This is driving me insane.

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Tijaak

· #4 · 7 d ago

My initial thought is a gummed up fuel pump or fuel filter from the old gas just sitting in there. Check EFI make sure ur all good there.

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monsterf7

Discussion Starter · #5 · 6 d ago

So I spent a lot of time last night messing around with the machine. I replaced the fuel sock at the end of the pump, drained all the fuel out and cleaned out any sediment in the tank, put fresh gas in and some seafoam. Still the same thing. I ended up figuring out what the problem is, the ISC Valve sensor is shot. I ended up spraying brake cleaner all over the area of the throttle body and while directly hitting the ISC valve sensor, the machine would idle perfectly for a little bit and then go back to the way it was. I took the sensor off and cleaned it and reinstalled. It seems to idle better but not perfect. So I ordered a new sensor, and o-ring ($214 for the sensor alone) from country cat and it's arriving Friday. Looking forward to replacing it to hopefully have a smooth idling machine.

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doorfx

· #6 · 3 d ago

Did you try the reset on the ISC?

2013 700 XT TRV EPS :
28" Bighorns on bed linered 08 Prowler rims , Wireless winch remote, 3000LB. Warn winch, Heated front and rear grips, Cat relay wiring harness for accessories, LED light bar, 08 650 trv LTD rear box, Heated rear seat, Elka stage 3 shocks all 4 corners, Aftermarket A-arm bushings, aftermarket sway bar bushings(prototype), Deluxe brush guard bumpers front and rear, Red anodized Hause fairlead, beverage opener winch hook, Synthetic winch rope, RTR motor mount bushings, Dynojet PC5 programmer, Dynojet Autotune, [/B]

07 500 Gone but not forgotten;
Dynojet/142m/45p/3rd/3turns--Clipped and drilled--Unifilter--Easy adjust PMS--L.C.V. mod--AC Swaybar--Exhaust mod--2"Snorkels--Sanny shock bushings-- Airdam stage 1--PSC phase 2--21/ 23gr rollers--Dalton yellow spring--.7mm shim--Sanny Steerlites--RTR Flex Bracket--2 up seat / pegs--Tach--AC handguards--28" Outlaw mst's--Skull tailight--Skull shifter--Self Resetting Breakers--1" Wheel spacers--Customcncparts Steering Damper--AC deluxe handwarmers--6000k HID'S hi/lo--AC Deluxe Bumpers--Inline Fuel Filter-- O2 sensor \AFR guage--Black Magic Full Stainless Exhaust System--Wireless Winch Remote--29.5 Outlaws--Fox Podium X Rear Shocks--

It's mind over matter,If you don't mind,
It just doesn't matterCat happy

No Boost No Bottle
just balls and throttle

Reply

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Like

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