m-7 running rough

[rocket-ron]

I have a 2006 m-7. intermitant running rough/missing. Almost seems like pre ignition/detonation. It can do it anytime, any throttle, any altitude, sometimes after a ten minute ride or hours into a ride. I have changed everything that I can think of. I have tried another coil/wires, ecu, engine complete, tested fuel pump/pressure 45psi, wiring harness, disconnected everything going to handle bars, fuel injectors, disconnect tail lite wiring, no check engine lites, tried different fuel station, disconnected dash gauges, can an air temp sensor cause this seems ok, the only mod is a mrsp can.

 

[ippielb]

M7 dont like cans, put a stock suitcase on and see if it works better

 

[neilsleder]

Try cleaning or tightening all the grounds. And check power valve cables. My wife's m7 would run good then it would start running bad then make the odd good pull and it ended up having one power valve cable unhooked


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[moyiesledhead]

Also check the atmospheric sensing tube to your ECU. If they get plugged it will cause issues.

But it's probably that can. Turf it and use the stock one.

 

[dezmitchell]

i 2nd the can ....I ran a mbrp for years then the packing all blew out and it was doing exactly what you described couldnt figure it out for the life of me .....kind of pissed after all the effort and it was as simple as a can.

would run like crap totaly at random no matter what altitide, throttle position or how long it ran good before.

 

[ACP]

I have a 2006 m-7. intermitant running rough/missing. Almost seems like pre ignition/detonation. It can do it anytime, any throttle, any altitude, sometimes after a ten minute ride or hours into a ride. I have changed everything that I can think of. I have tried another coil/wires, ecu, engine complete, tested fuel pump/pressure 45psi, wiring harness, disconnected everything going to handle bars, fuel injectors, disconnect tail lite wiring, no check engine lites, tried different fuel station, disconnected dash gauges, can an air temp sensor cause this seems ok, the only mod is a mrsp can.

Number One Make your font size bigger, hard on this old guy. Not dismissing any of the other options but check the wires that run down the steering post and if you haven't already put the inline fuel jet in your line, biggest $5 improvement you can make.

 

[Mare]

I also agree with changing the can back to the stock suitcase. I had an 05 M7 and ran terrible with the can on (MBRP). Put the stocker back on, ran flawlessly.

 

[Weirboondocking]

My old m7 would sometimes act up and it turned out to be the smart valves not opening on the fuel tank. The fuel pickups have a smart valves on them that does not let air into the fuel system. Check to see if they are good by pushing the valve closed and then lettin them spring back.
Good luck

 

[sled-fiend]

Like said above, my 06 M7 did that with a can on it, put the stock can back on and runs perfect day in day out.

 

[rocket-ron]

Thanks for the input. heading to the skaguay summit in the morning will swap cans up there and let u know.

 

[rocket-ron]

Well I am back, the can didn't solve anything. drove the sled for 5 hours before it acted up, swapped cans right there and still acted up. Disconnected the throttle switch took the can right out and still did it. After this the next morning it ran bad right after starting it, not at idle but at around 4200 rpm.

 

[ippielb]

Can't remember but I thought there was a DIY thread on how to set the TPS might be on hardcore sledder. Have you checked your smart valves in your fuel tank? They may be sucking closed and not bouncing back.

 

[Modman]

I would check the compression on it.

 

[TROLLCAT]

I would check the compression on it.

go for the juggler vein first

 

[jjack]

try checking the resistance on your plug caps.

 

[rocket-ron]

Thanks again for the advise. The complete engine has been changed(used), also plugs, wires and coil, and the fuel pressure is steady at 45 psi. Has any one heard of fuel line from the pup to fuel rail coming apart inside or any throttle position sensor problems.

 

[nathan#19]

I would be looking very closely at the power valve system, and the reeds. Reed valves can be surprisingly intermittent. Chech for splits or pieces broken off,

 

[rocket-ron]

The reed valves are fine. Someone said that the throttle position sensor can cause concerns. Is this true.

 

[ippielb]

easiest way to check that is swap throttle bodies with someone else.

 

[pano-dude]

or test the tps with the correct tester.....