Arctic Cat 2009 550 H1 EFI 4x4 - Answered Questions & Fixed issues

Based on the information you have provided, there are a few possible causes for the issues with your 2011 Arctic Cat 550 EFI. Here are some suggestions for troubleshooting:

Check the fuel injectors: If the fuel injectors are clogged or dirty, it can cause issues with starting and idling. You may need to clean or replace the fuel injectors.

Check the fuel pressure regulator: If the fuel pressure regulator is not functioning properly, it can cause issues with fuel delivery to the engine. You may need to replace the fuel pressure regulator.

Check the air intake and filter: If the air intake or filter is dirty or clogged, it can cause issues with fuel delivery and combustion. You may need to clean or replace the air filter.

Check the throttle body: If the throttle body is dirty or clogged, it can cause issues with fuel delivery and combustion. You may need to clean the throttle body.

Check the ignition system: If the ignition system is faulty, it can cause issues with starting and idling. You may need to replace the spark plugs or coil.

Check the battery: If the battery is weak or not providing sufficient power, it can cause issues with starting and idling. You may need to replace the battery.

It's important to note that these are just suggestions based on the information you have provided..

Question edited for clarity and correct name of maker. Question moved to model category. It is a known issue and is likely a bad connection or a fault with the fuel level sender unit. https://www.google.com/search?q=2010+Arctic+Cat+550S+ATV.+The+fuel+gauge+is+blinking+empty+when+tank+is+full ..

replace starter

follow the wires

The top is usually just clipped on in several places

yes i believe so. unless you are a good tech w/tools it is a job i wouldnt try to be honest. take to a qualified shop. save youself the headache thats sure to follow. be prepared to shell out some serious cash also. good luk.

I take help from online websites that have this service like helping in repair some like reliable-store have instant help.. others are a bit slow which I don't prefer... rest is up to u.. U can also get free manual works fine .

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it could be something clogged up and it is running out of fuel,i would check fuel lines,carburetor,etc. does it start right back up?if not,give it a few minutes to let fuel fill up carburetor,then try starting.if it starts back up after letting it sit a few ,sounds like fuel starvation to carburetor.

po635 should be for power steering issue.

Pour a few tablespoons of Automatic Transmission Fluid (ATF) down the spark plug hole into the cylinder. Leave it sit with the ATF in it for a few days. With the spark plug still removed, crank the engine over a few time to expel the ATF from the cylinder. Turn the key off, spray a light squirt of starting fluid or carb cleaner down the the spark plug hole into the cylinder and install spark plug. Try and start as you normally would. Soaking the cylinder a few days with the ATF should dissolve any rust/corrosion that may have frozen the piston rings to the cylinder wall. If still will not crank over, then I would suspect the starter is corroded or bad. Of course it could also simply be a bad starter relay. To test this I would use a jumper wire from the battery positive side to to the starter side of the starter's relay. If the starter whirls to life, then this would confirm the relay needs replaced. If the starter still will not engage then you're back to either a bad starter or the piston being froze in the cylinder.

Safety switch to prevent starter actuation when in gear. Look for a switch along the shift lever somewhere.

If fresh gas, you should check and replace the air filter (if needed) and remove and replace spark plug(s). Change the oil while you're at it (but this has little to cause the problem you're describing).

Here is the service manual for your machine where you can see how the terminals are connected. http://www.mymowerparts.com/pdf/Arctic-Cat-ATV-Repair-and-Service-Manuals/

use a 12 volt test light connected to ground and touch the contacts on top of each side of the fuse . It should light up. if not replace the fuse. Here are the service manuals for all Arctic Cat ATVs Parts House Lawn Mower Parts and Chain Saw Trimmer Parts

remove both battery cables from battery and touch them together for 1 min. should do it. if efi is out and comes right back on after starting you got efi problems

spark @ plug ? gas to eng ? compression in eng? will run if you have all these. adjusted properly !!! what do you have or dont have ?

vaccum leak ? hoses cracked at connector. intake manifold leaking ,cracked ?

throttle position sensor bad ? map sensor equipped ? not sure on that model but be my starting point. not sure if adjustable idle ? efi . does all that i think. read owners manual and see if they use injector cleaner of any kind. pressure regulator can cause this too. wish i could help you more. i need go back to school on that one. sorry please let me know what you find thanks

u must always hav 12.6 v for a coil ignition--u cud hav hurt the alternator - the relay is burnt too probly - the spark area and wiring seems to hav issues--get a clymer manual for detaild engine work--cdi is capacitor discharge ign