EFI sled blew up - How to diagnose? started by arcticcatmatt
	October 29th 2009 at 10:39 AM Post #1
	arcticcatmatt Spleen Splitter arcticcatmatt leaving after work for 3 days of shotgun season back home! Updated Yesterday at 12:16 PM 14007 Posts Group: Moderators Member Since: November 25th 2001 Location: Berkshire, NY, USA Current Sled: 96/97 ZRT 600 2008-2009 Miles: 450
	A coworker has a 93 Arctic Cat Wildcat 700 EFI that blew up 2 years ago. It has been parked since. The engine just locked up and he has not taken it apart yet. He said just before it blew it was running better than ever and beating every sled it ran against, then POOF. So, sounds lean to me. Anyways, when an EFI sled blows up, how do you know how to diagnose it? I am assuming just read the piston just like on a carbed sled? But on a carbed sled there is more things to check. I don't know jack about EFI so any advice is appreciated that I can share with him and help him get back in the snow. Rating: 0 Quick Edit Edit Topic

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	October 29th 2009 at 12:28 PM  [ Modified October 29th 2009 at 12:29 PM ] Post #2
	Quinlan Department of Corrections Quinlan is a little disappointed that he received HMK Highmark 4 boots instead of the Highmark Pros as he had anticipated... Updated Yesterday at 6:19 PM 9720 Posts Group: Moderators Member Since: December 8th 2003 Location: Fargo, ND, USA Current Sled: 06 SP 440/700, 98 ZR 600 2008-2009 Miles: 365
	The fact that it was running better than ever before meltdown makes it sound like it leaned out to me also. Pistons might definitely be a tell-tale sign. Could have been snow ingestion maybe? I know it was a problem in the newer chassis's (98-02), not sure about the older ones though. The intake boots were known to crack and go bad, and would eventually leak and suck in air/snow, causing some meltdown issues. The boots on my ZR went bad, but I caught it before it got bad enough to do any damage. Just a thought... 2006 Arctic Cat SnoPro 440/700 EFI 1998 Arctic Cat ZR 600 EFI Custom 1996 Ski-Doo FormulaIII 600 A mountain lion roaming the prairie found a bull, killed it and ate the entire bull. With a heavy belly, unable to walk, the lion laid in the tall grass moaning and roaring. Soon a hunter, attracted by the roaring, shot and killed the lion. Moral: When you're full of bull, keep your mouth shut! Rating: 0 Quick Edit Full Edit

	October 29th 2009 at 12:35 PM Post #3
	440_jag 450 horse ditch bannger 1488 Posts Group: Members Member Since: July 30th 2007 Location: Galesville, wisconsin, USA Current Sled: 2002 zr 500 cce 2008-2009 Miles: 500
	X2 on the boots. I would go towards a lean out. Sense its about the most common thing to happen to about any sled. As far as electrical diagonstics, no idea. best way is to tear into it 2002 Zr 500 CCE D&D pipe ported polished y 6 inch riser Acerbis Handguards Chrome winshield Pro-glider Rack Rsi pad Ripped graphics Fox snow pro shocks clickers Rating: 0 Quick Edit Full Edit

	October 29th 2009 at 4:21 PM Post #4
	Festus33 SNO PROwler 1285 Posts Group: Members Member Since: February 25th 2006 Location: Mukwonago, Wi., USA Current Sled: Eccentrica and Da Prowla 2008-2009 Miles: 647
	Bad crank seal's cause it to lean out also. Rick Let's Take All the Warning Label's Off, and let Nature Sort it Out !!! 1998 A.C. EXT 600 Triple/Triple 1990 A.C. Prowler 440 SNO PROwler 1987 A.C. ElTigre 440 1994 A.C. Tigershark 640 Daytona www.johnmaster.net (Snowmobile Traction Product's) mpsalvage@msn.com ( Snowmobile Salvage and Part's) Rating: 0 Quick Edit Full Edit

	October 29th 2009 at 4:34 PM Post #5
	motodeficient Waiting for more snow 1358 Posts Group: Members Member Since: July 21st 2007 Location: MAINE Current Sled: 04 XC 660 SP 2008-2009 Miles: 800
	Could have stopped pumping oil too. Rating: 0 Quick Edit Full Edit

	October 29th 2009 at 5:26 PM Post #6
	flatlander_summit The Law flatlander_summit combined yesterday, combining today... Updated Last Sunday at 9:15 AM 1173 Posts Group: Members Member Since: February 3rd 2005 Location: Jamestown, ND, USA
	I would guess that it is likely the crank seals or bad PTO end bearing that went out causing it to suck in air at the crank. 04 MXZx 440 03 MXZx 800 Factory Mod--soon to be 144 with some more goodies. 99 Summit X 670 98 MXZ 583 It's starting to look like I bleed yellow. Rating: 0 Quick Edit Full Edit

	October 29th 2009 at 7:21 PM Post #7
	stormrider62033 wally 4729 Posts Group: Members Member Since: December 25th 2004 Location: Gillespie, IL, USA Current Sled: 99xcr 800 2008-2009 Miles: 500
	on this big ole 650 wildcat of course its carbed,, the bottem end went out with very little piston scoring ,but it was running great and just locked up like you described mid Il alway's waiting for snow,moving north(way north)2001 thundercat 99xcr 800 97SPX ULTRA 96 zrt 600&800,92 doo plusX 92 v max 4 750 Rating: 0 Quick Edit Full Edit

	October 30th 2009 at 9:33 AM Post #8
	arcticcatmatt Spleen Splitter arcticcatmatt leaving after work for 3 days of shotgun season back home! Updated Yesterday at 12:16 PM 14007 Posts Group: Moderators Member Since: November 25th 2001 Location: Berkshire, NY, USA Current Sled: 96/97 ZRT 600 2008-2009 Miles: 450
	Crank seals and bearings are also on my mind. I just bought some SPI pistons for his sled. Need gaskets next. How do you check the amount of oil going into an EFI engine? How is that moderated? I am sure this thing will be getting new crank seals, bearings, pistons, rings, wrist pins, jugs.. just want to make sure it wasn't lack of oil so it does not happen again. Rating: 0 Quick Edit Full Edit

	October 30th 2009 at 9:45 AM Post #9
	xcr440 Sundowners Trail Coordinator xcr440 is drinking high lifes polishing the sleds. Who wants to help.... Updated Over 3 hours ago 12581 Posts Group: Members Member Since: February 1st 2003 Location: St.Germain/Edgerton, Wisconsin, USA Current Sled: 03prox700/97xcr440 2008-2009 Miles: 610
	It been a long time since I have seen a 700 cat but doesn't it have oil lines plumbed to the block. Again it has been 10+ years since I have been around one. 2 co-workers had them. It semed like they put pistons in them nearly evry 2 years. Was like they would eat them??? a good beer drinker isnt a picky beer drinker Loggers.... Working their ass off so you can wipe yours! "Steep ground is when your cutting a notch and notice a mountain goat looking at you like you are crazy." - Hexan woodbooga: (WOOD-boog-ah), n. regional dialect, common to areas of New Hampshire and Maine including the towns of Ossipee, Alton, Farmington, Acton, and Lebanon; one who attempts to obtain free firewood to fuel woodburning appliances in an effort to mitigate expenses related to home heating with fossil fuels. Frequently used as a term of derision by non-woodburners who mock the presence of loose bark and other wood waste in the beds of their pickup trucks. 2003 Pro x 700 almond/blue,10-66 black/red team 719 T-flow, 440 mains 1997 xcr440 my clutch kit, 380 mains,T-flow Rating: 0 Quick Edit Full Edit

	October 30th 2009 at 10:41 AM  [ Modified October 30th 2009 at 10:41 AM ] Post #10
	stormrider62033 wally 4729 Posts Group: Members Member Since: December 25th 2004 Location: Gillespie, IL, USA Current Sled: 99xcr 800 2008-2009 Miles: 500
	I would also maybe run a little premix in the tank ,with the oil injection ,infact if you look at most manuals it states that when the temperature gets to a certain point suppose to premix the tank 50-1 along with the injecter oil ,,,I usually go 70-1 mid Il alway's waiting for snow,moving north(way north)2001 thundercat 99xcr 800 97SPX ULTRA 96 zrt 600&800,92 doo plusX 92 v max 4 750 Rating: 0 Quick Edit Full Edit

	October 30th 2009 at 11:34 AM Post #11
	PrtclMn001 Doin' the things a particle can... 272 Posts Group: Members Member Since: January 6th 2009 Location: Oneida, NY Current Sled: '09 Arctic Cat T500
	I've found that stuff I've learned about carb'd sleds applies to EFI sleds (with the exception of carb work obviously )... atomizing fuel is aromizing fuel whether it's a carb or EFI Rating: 0 Quick Edit Full Edit