Need help with mystery problem!
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Joined: Mar 2006
Posts: 70
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From: Middle TN
Need help with mystery problem!
Bike is an 03 Electra Glide, stock ECM, S&S 510G cams, K&N airfilter, Power Commander, andSE street legal slip ons factory headers. It's at a tuner now with a weird problem that has all of usscratching our heads. Runs great on the dyno until around 4000 rpm then starts losing HP. Here's the strange part. The hotter the motor gets the worse the numbers get. Nomissing or popping, just quits pulling. Tried new coil and plug wires. Plugs are fresh and color is good. AF mixture stays good through out the run. Took out the head temp sensor, no change. We're thinking there may be an issue with the ECM but I'd hate to drop the dollars on a new one with out knowing for sure. I talked to the dealer and their response was " get rid of the Power Commander and let us put in a new SE Super Tuner". Any ideas?
Thanks
Thanks
Outstanding HDF Member
Joined: May 2007
Posts: 2,304
Likes: 31
From: Florida
RE: Need help with mystery problem!
If you could post the graph we can read whats going on. I see a ton of bikes with the cam off one tooth, it will run fine but the power drops quickly around 4000~4500 rpm. This is a mistake made a lot of times.
Road Master
Joined: Dec 2006
Posts: 1,058
Likes: 6
From: Omaha Nebraska
RE: Need help with mystery problem!
This reminds me of when we dynoed a customer's hopped up truck who came to us with a similar problem, it had a defective new muffler. The harder we ran it on the dyno the muchless power we had. It turned out that the muffler's internal baffling came loose and when hot, a piece of the baffle folded over like a one way valve and created tremendous back pressure, cooled off and everything wasOK again. When customers have catalytic mufflers, it's the first thing we suspect but this guy had his cats already removed so an exhaust problem was the last thing we suspected. This story is probably errelevent here but I found his problem interesting.
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Joined: Mar 2006
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From: Middle TN
RE: Need help with mystery problem!
Thanks for the replies folks! Cams checked ok. I'm not puking oil from the AC so I don't know about the wet sumping. Gonna change the MAP sensor and try it. Next step is to remove the PCIII from the system and see how it runs. Thing is the bike makes the 1st run on the dyno great, making almost 70hp. 2nd run not as good, 3rd run gets worse. During the 2nd and 3rd runs it drops out around the 4000 rpm mark. It's almost like it's got a governor on it. Local HD dealer insist they can make the problem go away with the new super tuner. They can't give anyinput other than that.
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Cruiser
Joined: Jul 2006
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RE: Need help with mystery problem!
Could it be overheating, and causing the pistons to bind up ?
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Outstanding HDF Member
Joined: May 2007
Posts: 2,304
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From: Florida
RE: Need help with mystery problem!
I have to agree with ajayrk in that case....run the bike for 10 min or so and pull the drain plug from the bottom of the case (should be a torx plug) with the bike straight up drain all the oil out of the crank case into a measuring cup.....if you have 8 0z or more you have a sumping problem.
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Joined: Mar 2006
Posts: 70
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From: Middle TN
RE: Need help with mystery problem!
OK I'm ready to learn something here. I thought I'd see oil puking from the AC if I were wet sumping. How is the dyno run and wet sumping connected? Is it a heat issue related to the wet sumping?Shouldn't I be getting some kind of codes if it's an overheating issue?Thanks again for the info.