have you checked your air filter i have a 2021 scrambler 1000 that felt like it lost some power on the top end and the filter did not look real bad but cleaned it out real good and right back up to 75-80

 

Yes, I've checked the filter. It seems just fine.

 

How do the clutches look and belt???

 

How old is the gas in the tank?

 

if it is just at higher speed it could be a bad belt or something in the drive train does it act/ drive normal at slower speeds

 

I haven't checked the belts/clutch. I'm honestly not exactly sure how to do so, or what to look for, but I'm sure I can find a YouTube video on the topic.

The gas isn't very old. I use the Ranger daily for around the property , light duty work, so I add gas regularly.

The erratic acceleration isn't only at top end. It's pretty much at any speed. It seems like I need to ease it up to a constant speed, before I can give it more gas. If I 'punch it' it won't respond.

 

The erratic acceleration isn't only at top end. It's pretty much at any speed. It seems like I need to ease it up to a constant speed, before I can give it more gas. If I 'punch it' it won't respond.

You don't give it gas - you give air - it's the job of the fuel system to supply the gas mixed with the air for proper performance. What's the fuel pump pressure? Most EFI problems are attributed to a failing fuel pump - if it isn't the fuel pump, then it needs to be plugged into a diagnostic program to determine the cause. Then, corrective action may be taken.

 

with the quad in neutral how does it seem, does it rev right up when its not in gear or does it so it then as well if it runs right up on the rpms when in neutral then it sounds like a belt or clutch causeing the problem if it was tps it would do it when its in park as well i think

 

Understood. I just did the NEUTRAL acceleration test, and it seemed to rev smoothly from ilde to 4400 or so. Tried
it twice since first time I'm not sure engine was warmed up enough - it seemed a bit less smooth the first time.

Checking the fuel pressure is next on the list. I'm hoping it's not a belt/clutch. The clutch, and drive belt, were replaced back in 2015.

 

regardless what it turns out to be i would replace the belt if its 7 years old

 

Uhh... You don't test the TPS or set base/idle voltage or calibrate the TPS with the engine running regardless of what you may have seen on some amateur tuner's YouTube video.
The throttle body should also be cleaned spotless. All wiring harnesses and connectors to the CPS, TBAP and TPS should first be confirmed to be in good condition and clean.
If you're gonna try to DIY you need to do it right or you're just wasting time and effort.
Otherwise... take it to the dealer.

 

Polman, thanks so much for your inputs. I'll stop believing all I see on YouTube. So before I started the engine, key on, the volt meter read 7.2vdc. I've seen posts that indicate a 2009 700 should read 0.660 vdc. Post also indicate NOT to tweak the idle screw, but to loosen the TPS mount, rotate slightly until you get closer to spec.

Can you confirm correct baseline voltage and adjustment should the 7.2v be incorrect?

Yes, I will do a thorough check of all the wire harnesses, and clean out the throttle body.

Also, in a previous reply I mentioned the clutch and belt were replaced back in 2015. They have 300hrs of wear since they were replaced.

 

in the polaris owners manual its says to check belts after 50 hours and your clutch every 100 hours for a clean and check so you are a little over given i dont know how you use it it may be just fine just saying though

 

Along with Polmans suggestions I would throw a fresh belt at it and clean up those clutches. 300hrs in my book is roughly 3,000 miles so at the very least a new belt and clutch cleaning is in order as far as PM goes!!

 

Low fruit- spark plugs?

 

I'll get into the clutch housing and take a look around. Not seeing any details in owners manual as far as how to clean
the clutch. I suspect a belt inspection entails simple visual wear/cracks and the like. Is there something else to look for?

I replaced the plugs a few weeks back, and no joy.

 

So my belt/clutch cleaning method is to hose the clutches off, dish detergent mixed in warm water and towel wide the clutches, hose it down again, let stand and dry or use shop air or a pack pack blower to dry off, then using a Scotch-Brite pad lightly scuff the sheaves perpendicular to rotation, blow off all the debris Scotch-Brite pad, spray brake clean to a clean rag and wipe down the sheaves, and that should have you good to go.

As for the belt look for any chunking, burn or melted spots, cracking or dry rot, any loose or broken cords. If possible verify that is the correct belt for the machine!

 

Sounds like you found the problem.
I wouldn't mess with the TPS until you get good fuel pressure and test run the machine.
Didn't realize you hadn't checked pressure yet.

 

Well, I just got around to replacing the fuel pump.

It works GREAT! Can't believe the acceleration! It's been a while since I've had a chance to open it up some.

I actually replaced the whole assembly. Got it from Quantum. It was only $20 more than just the pump replacement, so pretty much a no brainer. Separating the old fuel housing assembly wasn't a pleasant experience, but the complete unit had me up and running in less than 20minutes.

I plan to check a few of the items folks had mentioned as well, but it does seem that my original problem is fixed.

Appreciate all the timely responses from folks. Thanks.

 

2009 Polaris 700 XP EFI has been having some issues with smooth and/or top end acceleration. Read many a post
about potential issues and have check out most of them, best i could.

Most recent check was TPS. At idle, which was a bit low at 960 or so, the volt meter read 0.72volts. ( i probed the TPS
from the connector (YELLOW wire to GND). As I accelerated, voltage increase relatively smoothly. Didn't see any major jumps. At about 4000 RPM reading was only 1 volt?

I a couple of videos I've seen with guys checking the TPS, using the Polaris meter, the voltage range seemed to go as high as 3 volts when wide open. I didn't go to the floor on the gas, but was wondering if the 1v seems normal.

Thanks for your support.

I THINK IT SHOULD BE AROUND 5. NOT 1...JUST FROM READING AND TESTING MINE

 

ALSO GROUNDING IS A BIG THING ON THESE CLEAN ALL GROUNDS AND TERMINALS YOU CAN GET TO

 

Youtube VERY HELPFUL watch several...

 

Check to see if it's getting 5volts on powerline