Loss of Mileage, engine seems to be 'seeking' an RPM, Cruise is failing - Road Glide Forums
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post #1 of 19 (permalink) Old 04-24-2011, 10:58 AM Thread Starter
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Loss of Mileage, engine seems to be 'seeking' an RPM, Cruise is failing

So I just had the 1K service done on my 2011 RGU last week.

My indy used Amsoil in all 3 holes (not that it matters for the core of the story).

He also had these 'new and improved' spark plugs. I can't recall the name of them at this point, but the principles of splitfires and Iridiums come to mind. Supposedly would give better fuel economy and HP with a simple plug swap out.

Also as I've read other doing, I had my stock cross pipe removed, sent over to a local exhaust shop, where they gutted the cat and re-welded it for reinstall.

After I picked up my bike I took it for a spin and didn't notice anything different at first. But when I got out on the freeway and set the cruise, I noticed that the bike seemed to be 'seeking' an RPM/throttle setting to maintain speed. The constant acceleration and deceleration of the seeking felt almost like there was a large headwind buffeting the bike. But the problem remained - and is even there, though to a lesser degree, when I turn off cruise and maintain speed the old fashioned way.

The other problem is this - I was getting about 240 miles to the tank when the bike came off the showroom floor. I just went out for a ride, I have half a tank and i've only about 70 miles on the trip odo. WTF!?

So NOW here comes the hard part. If I weren't such a dope, I'd not have done both the plug swap AND the cat gut at the same time - that way it'd be easier to pinpoint the culprit(s) contributing to my lack of fuel efficiency.

I've done some research on here and I have reached a few conclusions -

1. Removing the Cat is making my O2 sensors crosstalk and hence leading to an accurate fuel/air mix in my cylinders making the bike seek an RPM setting and hence creating a significant reduction in my fuel economy.

2. The newfangled sparkplugs are at fault.

3. My cruise is falling prey to the number of issues I've seen other folks on here have.

4. Some gremlin is syphoning gas out of my tank and it's all in my head.

The first step I'm going to take is to ask my Indy if he threw my old plugs out - if he did, I'll go to HD and pick up some new ones to replace the newfangled ones. If not, I'll have him R&R and try another test drive.

I'd like to hear some opinions of you folks on here (save for what you have to say about option number 4 and my belief in gremlins).

Thank you very much,
Tim
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post #2 of 19 (permalink) Old 04-24-2011, 11:17 AM
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A tuner would help...Mobil1 synthetic is the way to go. Open the air breather, and HD plugs are over priced get some NGK's at your local automotive shop, thats all I've ever ran and have great luckwith them, at $2 a plug... I hope you get all your issues worked out.

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Last edited by 2 bike Mike; 04-24-2011 at 11:23 AM.
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post #3 of 19 (permalink) Old 04-24-2011, 11:19 AM
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I would look at the catless head pipe as the culprit. Plug change should not have halved your mileage in my opinion.

Do you have a tuner on your bike? Was the better "breathing" addressed when the cat was removed?

My experience is that exhaust changes and intake changes almost always require some ECM tuning.

...and I used to think my Sportster was heavy...

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post #4 of 19 (permalink) Old 04-24-2011, 11:24 AM
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I had a friend that tried new plugs and had similar problems. Try putting the old plugs back in. OEM's are really good plugs from what I understand. Also, did you have the bike retuned after the mods?
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post #5 of 19 (permalink) Old 04-24-2011, 11:24 AM Thread Starter
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I had a TTS Tuner for my previous bike - Just bought it about a month before I totaled it (2006 Ultra Classic).

I haven't yet tried plugging in the TTS for the new bike yet because I think I recall it said it was for 1 bike only - maybe they mean 1 bike at a time... I don't know.

I will definitely try running the TTS in autotune to see if it helps my issues.

My buddy had put in some fancy spark plugs into his ride and it started running like CRAP. Took it to the local dealer and they took out those new plugs and put in old fashioned HD ones, and it totally fixed the problem....
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post #6 of 19 (permalink) Old 04-24-2011, 11:30 AM Thread Starter
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I didn't re-tune. I was under the impression that a simple removal of the cat wouldn't require a retune - especially since the stock intake and exhaust is still on.

I'll give the retune a try, hopefully the TTS will accept my new bike.
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post #7 of 19 (permalink) Old 04-24-2011, 12:09 PM
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Removing the cat is your problem, you took almost all your back pressure away. Also the O2 sensors on Harley's are vary narrow band, meaning they can not make big adj. I pulled my cats off, had to make a ton of adj. to make run and I never have gotten my mileage back.


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post #8 of 19 (permalink) Old 04-24-2011, 12:19 PM Thread Starter
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Quote:
Originally Posted by scsharp2260 View Post
Removing the cat is your problem, you took almost all your back pressure away. Also the O2 sensors on Harley's are vary narrow band, meaning they can not make big adj. I pulled my cats off, had to make a ton of adj. to make run and I never have gotten my mileage back.
That blows - seems counterintuitive too. I always heard cats were a restrictor and therefore a hinderance to mileage and performance. I don't mind losing a mile or two a gallon, but literally cutting my mileage in half blows.

What did you try to adjust? Did you use a tuner? I'm going to try either the TTS tuner or the TV-3 from Terry.

Thanks,
Tim
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post #9 of 19 (permalink) Old 04-24-2011, 02:31 PM
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Quote:
Originally Posted by scsharp2260 View Post
Removing the cat is your problem, you took almost all your back pressure away. Also the O2 sensors on Harley's are vary narrow band, meaning they can not make big adj. I pulled my cats off, had to make a ton of adj. to make run and I never have gotten my mileage back.
Agree 100% with scsharp2260! Removing cats has changed the air-fuel mixture needed, and O2 sensors are trying to adjust. Get a tuner.
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post #10 of 19 (permalink) Old 04-24-2011, 02:35 PM
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I'd put back the factory plugs & then see what happens. I can't see where just removing the "cat" would cause all those problems,but I'm not a meck-a-nick. The oil is not the problem. Please let us know what you find out. Good Luck


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Last edited by Hillglide; 04-24-2011 at 02:36 PM. Reason: spelling
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