Help! One cylinder not getting warm!!

[SIRsleeper]

So I just threw in injector o rings and fixed my fuel leak. Fixed that problem. Now the cylinder that had the leaky o ring is running cold, plug was fouled. Put in fresh ones sounded better for about 30 seconds and then back to square one... Is my injector stuck open? How do I test these? I am getting spark because it's running on both cylinders and does throw SOME heat but temps are way off on both pipes. Was gonna sell this thing before I move away but it's looking like it's mine for a while now.

It's an 06 m7 with 900 big bore, v force reeds with new petals 30 miles ago.


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[SIRsleeper]

Forgot to mention, perfect 130 psi compression both sides.


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[TROLLCAT]

swap injectors and see if the problem moves to the other cylinder

 

[tchriste]

This summer I picked up a new set of injectors and had one that would not work properly. The Cat dealer I got them from said it was a common problem and that the solution was to take a 12V battery and briefly touch the injector terminals and listen for a "click". He said that they see many sleds come in at the beginning of the season with one cylinder not firing and this usually corrects the issue.

 

[SIRsleeper]

Just tried the injector swap, still the same cylinder that's got the cool pipe. When I did ride it (before this issue popped up) after about a half hour I had an injector fault pop up on my boondocker. Could I have a wiring issue?


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[SIRsleeper]

It's the side of the pull start. Is that the mag side?


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[craptabulous]

If you have a boondocker i would sudjest checking the harness . I found six spots rubbed through on mine .

 

[slomo]

i have also seen reeds cause this i would check for a broken one

 

[SIRsleeper]

Reeds were just done before my first ride but I guess anything is possible.


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[SIRsleeper]

Just bypassed the boondocker and still does the same thing


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[marcel.]

Its probably not your issue but check if you have a spark.

 

[CamoKVF700]

Over fueling might be the issue. Your electronics are telling the injector what to do. Hence why it's not the injector.

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[SIRsleeper]

I believe it to be over fuelling for sure! What I do know is this showed up after a rough landing where I fell off the sled, so I likely knocked something loose. I really hope I didn't fry the ECU. I've found and repaired a couple wiring issues, my injector wires ohm out good (boondocker side) though I have yet to ohm out back to the computer due to a lack of schematics, which I've pretty much determined the issue to be in factory wiring


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[SIRsleeper]

If it's not over fuelling then maybe a really weak spark!? It does fire on that cylinder, just doesn't make any heat and when you pull the pipe she's full of gas.


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[cnelson6]

I've got a ecu for a 2005 m7 if it turns out it is that.

 

[0neoldfart]

Check the main ground on the MAG side of the steering post. Not uncommon to have corrosion or a loose ground...other thing to test is fuel pressure - perhaps regulator is sticking, dumping too much fuel.

 

[moyiesledhead]

They also had a problem with tail light wiring chafing at the back where they go through the tunnel into the light. Caused all sorts of weird chit to happen.

 

[Mayfly]

Had similar issue on my M8 2008 and turned out to be ECU harness had pin not making connect when clipped.

 

[fj40]

Did you find a solution, mine seems to be doing the same thing.

 

[SIRsleeper]

Not yet I'm about to start digging around again. I just moved across the country so the sled hasn't exactly been a priority, however snow is good in Ontario this year! I'm wondering if I'm maybe leaning out the pto side and not flooding the mag side like I originally though? I'll be doing an ether test on seals soon. Does it with the boondocker unhooked also and I'm 100+ degrees off, it's just waiting to grenade... I was sweating every time I had to fire it up to load and unload it during the move.


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