I have a 2008 rzr and it runs like crap its only 3 months old . It has no midrange power . it has no trouble codes either. IM very enchanical as far as i can tell its running extremely lean !!! within the first 30 sec. of running the exhaust temp is already 900 degress at the manafold.

will a sportsman 800 ecu be better?

Take it too your dealer before you void that waranty...

__________________
2006 Silverado 2500HD Custom Truck
2007 Weekend Warrior FSW3200
2008 Ranger RZR 800 EFI (w/kids rear bench seat!)
2006 Honda CRF 450X (Set up for a BigPig.)
2007 Apex MRX100 (Taylor's New Ride!)
2001 ETON 50 ATV (Taylor's Old Ride!)
Coming Soon (Something for KatieBugs!)

jeromy ya what he said. take it to thy dealer. also while your there ask them the rpm range on an 800 sportsman cdi box.

sportsman ecu is pretty much the same..
you can take it to the dealer and let them look at it, but more satisfaction will come from fixing it yourself..

check the injector wires, make sure their both plugged in and in the right order..

if that's ok, put a meter on your tps signal wires..
make sure it reads about .739 at idle. if it doesnt, do a tps initialization.
also check the sweep, if the tps is bad that will mess you up too. wot should be in the 3.75 - 3.8v range

tps can cause all kinds of wierd problems, that voltage is what sets your ignition timing and fueling.

if it still doesnt run right, check fuel pressure at the schrader valve (37psi) you dont need a fancy fuel pressure tester. you can use a tire gauge just dont let it squirt gas in your eye.

How do I do a tps initialization??

__________________
2008 rzr snorkel, lift, 28x12x14 wheel spacers

there is a procedure in the service manual look under fuel injection it tells how to do it. you dont need the tps test harness just use the 5v vref from the ecu.

I dont have a service manual yet is there any way you can talk me through i t

pg_0132
pg_0133
pg_0134
pg_0135

thanks man

email if you have questions..
martymoe@martymoe.info

I have a similar problem but will start a new thread.Please let me know your thoughts

__________________
FOR SALE:Gen 2 Red RZR.Nerf bars,sport top,winch,14 rims with 26inch Goodyear MTRs.Afco shocks,Prerunner front bumper with 7 inch HID,HID headlights,,and EPI clutch mod.stereo and still original battery with a chargeguard installed to monitor
60 hours total and one hour on new motor installed by Polaris Motorsports Kamloops BC(first motor got dirt past filter but was denied warranty).Color was red but hard to tell because it burned to the ground on first ride

Jeromy,check your oil level.Mines 3 months old also and I"m burning oil from the rear cyl for some reason