compression?
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#2
Way low. 150-200 psi according to the manual. Wide open on the throttle and check again,but if still low, time to at least replace the pistons. Plated bores,can't bore them out. You really need to check the cylinder clearances to see if a new piston set will solve it or not. Manual goes into great detail on this.2007 Polaris Sportsman 800 EFI Service Manual PDF Download
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#5
Have wires on order , and no i'm not the original owner. Inside the boots the brass connection seems to be a little to deep and barely touching. Always ran a little off on idle (not strong) did the fuel filter and cleaned the injectors. Now it won't start, pretty sure it the plug wires, used quick start and it doesn't catch at all. They must have just been making a connection before.
Cleaned ground connections , coil connections and ecu connections with electrical grease.
Cleaned ground connections , coil connections and ecu connections with electrical grease.
#6
Checked fuel pressure along with the fuel filter replacement and injectors? Plus sticking in the boot against the cylinder the plugs should at least have spark. You might look over that cheap 5 buck manual at it's trouble shooting guides and checks. Can pay for itself first time you use it.
#7
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#8
Hummm...
So went poking around and found plugs fouled wet (black). Tested plugs and they looked to have great spark, so the plug wires work. Pulled the fuel pump and nothing obvious but will still have to check pressure when I get a gauge. Seems odd to have spark, compression and fuel? any other things I should check?
Things I noted: plugs fouled wet and black
battery tests weak on tester and weak on charge but turns over
small flames out throttle body when turning over Once and a while
been sitting all winter and was running, just idle was low and weak and needed throttle when started
didn't start then cleaned injectors on bench then did start first time (ran great) and after sitting hard to start, had injectors cleaned at shop and tested ok. now won't start
something electrical that I am moving while getting in there?
Things I noted: plugs fouled wet and black
battery tests weak on tester and weak on charge but turns over
small flames out throttle body when turning over Once and a while
been sitting all winter and was running, just idle was low and weak and needed throttle when started
didn't start then cleaned injectors on bench then did start first time (ran great) and after sitting hard to start, had injectors cleaned at shop and tested ok. now won't start
something electrical that I am moving while getting in there?
#9
Read this on problems on the 700/800 efi machines. Applies to all efi machines.https://atvconnection.com/forums/pol...ap-wiring.html Check the connectors and thin wiring on the tbap and tps sensors for any bare or soft feeling wires that may have melted internally. If you can rule out a fuel or mechanical problem and even if you have spark, a problem in either of these wiring harnesses can give you fits.You can even ohm out the wires to the connectors,but if the pins pull out just a little they can screw up the sensors input to the ecu. Like the manual says 85% of efi problems are wiring related. I'd still check fuel pressure just to eliminate it,then if it passes I'd check into the wiring. Polaris has crappy wire harness kits that fail over and over,but from the sticky posts OTB https://otbpowersports.com/products/ came out with stronger wiring and connectors.Wish I had those when I was repairing wiring harnesses.Plus codes may or may not be thrown which makes it even more frustrating.
#10