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[PapaAgnis]

2010 FLHTCUSE, V & H Power duals and Hi-Output slip ons, Stage 1 air cleaner kit and EFI Super Tuner (SEST). Mapping was carried out by the dealership when they installed the exhaust and I've been 90% happy with the performance (I've ridden about 8000 miles with it). At the 10000 mile service the dealer pointed out a bit of lag at low revs and suggested remapping to cure it.

Bad decision! After the remap the bike wouldn't idle properly, needed to be revved to pull away from a stop, and has lost top end power. I've put it on a dyno and the AFR is way lean (average about 15, peaks at over 17 between 3000 & 3500 rpm). I took the bike back to the dealership to have the old map restored - they've done this (and checked the plugs) but now it's running even worse than ever. It's misfiring below about 3000 rpm and is as lumpy as hell - also I've got fault codes P0131 and P0151 (Front and Rear Oxygen sensors low).

Does anyone know the root cause here? Is it faulty oxygen sensors, a bad map or some other problem?

[HOGMIKE]

2010 FLHTCUSE, V & H Power duals and Hi-Output slip ons, Stage 1 air cleaner kit and EFI Super Tuner (SEST). Mapping was carried out by the dealership when they installed the exhaust and I've been 90% happy with the performance (I've ridden about 8000 miles with it). At the 10000 mile service the dealer pointed out a bit of lag at low revs and suggested remapping to cure it.

Bad decision! After the remap the bike wouldn't idle properly, needed to be revved to pull away from a stop, and has lost top end power. I've put it on a dyno and the AFR is way lean (average about 15, peaks at over 17 between 3000 & 3500 rpm). I took the bike back to the dealership to have the old map restored - they've done this (and checked the plugs) but now it's running even worse than ever. It's misfiring below about 3000 rpm and is as lumpy as hell - also I've got fault codes P0131 and P0151 (Front and Rear Oxygen sensors low).

Does anyone know the root cause here? Is it faulty oxygen sensors, a bad map or some other problem?

Sounds to me like your dealer has a problem they need to take care of, unless there is something else that was changed from when it ran fine to now.
 

[PapaAgnis]

Totally agree, as does the dealer. But every visit to the dealership is a 70 mile round trip and a day wasted, so I'm just trying to get an understanding of the problem and what to do to resolve it. Spring's approaching and I'd rather be riding than sitting outside a bike shop!

[Deep Blue Dives]

Sounds like your dealership was doing what mine was - loading canned maps into your bike and hoping that your happy.  If your going through the expense of a dyno, just hook up with a good tuner and let him build the map for your bike.  After learning what my tuner told me about the set up the dealership loaded into my bike, I never would have been happy.  Good luck!

[Midnight Rider]

I would be highly suspicious as to whether they actually installed the old map back in the bike.  Did you get a copy of the old map when they did the original tune?

Either way, if it ran fine before the service and "new" map, they did something to f it up, didn't save a copy of the old map, and are now throwing out BS to cover their asses.

Just read your reply...If you've got the SEST (only has street legal calibrations) and not the Pro tuner, they did not do a tune, they just downloaded one of the street legal maps into the bike and called it good.

[grc]

Just because you get a O₂ sensor error code doesn't necessarily mean there is anything wrong with the sensor, it just means it is reading out of it's normal range.  That is backed up by the extremely lean readings you got from the sensors on the dyno.  While it's a little strange that this problem popped up immediately after the dealer screwed with the tune, it isn't a given that they screwed up the map and thus you have the problem.  You could have low fuel pressure, clogged injectors, or various and sundry other problems.  That's where proper diagnostic routines come in, versus shooting from the hip.  Harley actually provides diagnostic routines to their dealers to help them find and fix these sorts of things, but for whatever reason many prefer to just use the WAG method. ( For those unfamiliar with the WAG method, it means Wild Azzed Guess.)

I'd suggest taking it back to them (should have never left the shop if it was running that bad) and telling them to fix it.  If they remain clueless, look for a shop populated with real techs, not the dealer's otherwise unemployable kids, nieces, and nephews.  Good luck.


Jerry

[PapaAgnis]

I would be highly suspicious as to whether they actually installed the old map back in the bike.  Did you get a copy of the old map when they did the original tune?

Good point, I was wondering about that.

Hook up with a good tuner and let him build the map for your bike

That was the plan - I was going to get a Power Cdr V and a map done by the Dyno tuner, but I've put that on hold. If there's a problem with the bike I want it fixing first (should be covered by warranty) - that's why I'm after advice, I want to know if it's just a software problem (the map) or if it's faulty hadware as GRC suggested.

[glens]

Which interface is it that you actually have?  What's the full and proper name?  In any event, assuming you have also bought the computer software and cables, you can easily hook the unit up to the bike and record a running session.  Post the results here and we can take a look at what the ECM thinks is going on.

[PapaAgnis]

Which interface is it that you actually have?

It's the SE Pro Super Tuner 32109-08B. I've got the software and cables on order so that I can have a look myself - should be here next week.

[timo482]

dont do a power commander if you already have sert - just get sert tuned properly. only use ONE tuner - dont stack them up.

pc's are designed to run open loop on top of a stone stock tune in the ecm - no fuel adjustments [remember the reason that bikes have O2 sensors on them is that fuel contains alcohol in wildly varying amounts - without the O2 sensor the bike will wildly vary from very lean to very rich depending on the gas pump.