05 M7 runs like crap above 1/2 throttle

[Mountaintech]

Just bought the sled a few months ago. Has been running great till a few days ago. Runs like crap now above 1/2 throttle......breaks up, stutters, and won't make full rpms. Pulled the plugs, they had a lot of deposits on them so I changed them. No difference. Sled only has about 800 miles on it. Pulled the power valves because I thought they might be the culprit. They were dirty but I didn't think they were that bad. Haven't taken it back out again yet. Was thinking what else it could be if it still ran bad.......TPS?? Power valves seemed to actuate OK when I ran it after cleaning them.

 

[907M7]

I had the same problem with my sled and it turned out to be the power valve cables. Had checked everything: powervalves, clutch, sensors, ECU everything. But the cables were fraying. Worth looking into.

 

[Mountaintech]

I had the same problem with my sled and it turned out to be the power valve cables. Had checked everything: powervalves, clutch, sensors, ECU everything. But the cables were fraying. Worth looking into.

Thanks for the tip.

 

[Mountaintech]

Disconnected cables from servo motor. Good smooth movement on both sides. Time to take it for a test ride I guess.

 

[Shelfrost]

Adjust the cable length to 34.5 mm. Take them off servo motor, pull them a couple of times, lightly pull up the slack and measure the cable length that stick out of the sleeve to the underside of the lug. Makes a huge difference.

 

[pernikm]

a friend had reed trouble....

 

[Mountaintech]

Adjust the cable length to 34.5 mm. Take them off servo motor, pull them a couple of times, lightly pull up the slack and measure the cable length that stick out of the sleeve to the underside of the lug. Makes a huge difference.

Thanks for that measurement. I was wondering about that.

 

[Mountaintech]

a friend had reed trouble....

I almost pulled them off to check them. Might still. Sled runs good at part throttle.

 

[Mountaintech]

Well heres the verdict. Piece of air intake tract foam was stuck in one of my reeds.