Bad acceleration through gears

[lad]

So I started a post about this a while ago but it's a bit long, here's a link https://wildguzzi.com/forum/index.php?topic=108931.0

In short, i have non-linear acceleration in 2nd, 3rd, and 4th gear, like someone is putting on the brake during it.

Before I replace the TPS, I'm just wondering is there anything else to try?

I have new sparks, caps, and HT wires on it.

I took of the sensor and cleaned it and calibrated it but I didn't touch anything mechanical on the injection system.

It idles great, there's no backfiring, and it drives great other than that.

I took off the fuel tank and cleaned out the petcocks, there was a bit of rust so I gave it an electrolysis blast.

I can't get to the fuel filter, but I changed out the air filter.

I don't have guzziDiag or its connections.

cheers!

Based in Ireland also

[Murray]

I think you might want to go to the effort to get to the fuel filter, is there any way of logging fuel pressure to see if the rail is dropping under load?

[lad]

John Henry

thanks John, I really did want to do it, I imagine it was never done because it looks so old and stock, but I've no idea how to get to it, it's so deep and there're clamps everywhere, looks like a big disassembly.

it is around 3k that it seems to be happening, but then i can kind of navigate my way through it and there is acceleration there on the other side of the 3k, or sometimes there just won't be any trouble. So, it's intermittent.

FF is meant to be done every 6500 miles apparently, so...probably about 7 overdue. I'll order one anyway and brace myself.

[lad]

I think you might want to go to the effort to get to the fuel filter, is there any way of logging fuel pressure to see if the rail is dropping under load?

  i won't have a notion. I would guess yes, but it's not in my shed...

[fotoguzzi]

I don't understand why the fuel filter is not easy to get at, isn't it right under the tank on the upper frame tube? With the tank off it should be pretty easy to replace, right?
But the FF is the next thing to try it sounds like.

[Tkelly]

The fuel filter is not too hard to change once you figure it out and disconnect it,but it looks intimidating.I changed mine before replacing my tps which turned out to be the problem.

[lad]

The fuel filter is not too hard to change once you figure it out and disconnect it,but it looks intimidating.I changed mine before replacing my tps which turned out to be the problem.

I don't know what a bad TPS would feel like, but this feels like not enough fuel, maybe they're similar

[lad]

I don't understand why the fuel filter is not easy to get at, isn't it right under the tank on the upper frame tube? With the tank off it should be pretty easy to replace, right?
But the FF is the next thing to try it sounds like.

It's right under the frame, not the tank, and surrounded by enough wires to make Medusa looking like she's balding

[pehayes]

FF is meant to be done every 6500 miles apparently,

That is a ridiculously low factory specification.  Must have been required by someone who had investment in the filter supply company.  I have two 98 EVs.  I used to change as specified.  Its a brute of a task and usually requires some DNA spillage.  Now, one bike has 35K on its filter and the other is 70K on its filter.  Both run fine.  You might want to change yours due to age, but I really doubt it is clogged or the source of your problem.

Patrick Hayes
Fremont CA

[pehayes]

I changed mine before replacing my tps which turned out to be the problem.

Hey TKELLY.  Please clarify that line above.  It was the TPS or it was the FILTER that caused your problem???

Patrick Hayes
Fremont CA

[guzzisteve]

It's in a weird place but pretty easy, cut ties and drop it, then take hose off one end and banjo bolt on other end.

[Wayne Orwig]

With the age and all, change the fuel filter. It is annoying to get the wrenchs up in the frame to get it out, but doable.
Keep in mind though, that unlike a carb bike, on these fuel injected systems, the filter is flowing about the same amount of fuel 100% of the time. So the RPM and throttle position don't have much effect on the fuel filter flow.
From your description, it may be the TPS. They can cause odd behavior that is effected by the throttle position, of course.
And don't forget to clean the tip of the timing sensors. That can do odd things. It is a Call 1100i, correct? That has TWO sensors. Make sure you keep track of the SHIMS that are on the sensors.

I would start with cleaning the timing sensors.

Get the GuzziDiag cable. It is relatively cheap if you have a PC to run it.

[lad]

And don't forget to clean the tip of the timing sensors. That can do odd things. It is a Call 1100i, correct? That has TWO sensors.

Is there two? I thought there's an RPM sensor somewhere near flywheel, and then the one timing on the camshaft? Anyway, a clean can't hurt. Just pop them out and use WD40? Or electrical contact cleaner ?

I'm going to do the fuel filter anyway, I like to just give it a routine service myself when I get a bike so I can ride in peace. Maybe i'll replace the TPS because it looked gunky and it's the wrong model and everyone is telling me that's what it is. I'll do them all one at a time anyway to potentially get an answer.

thanks

[Wayne Orwig]

Is there two? I thought there's an RPM sensor somewhere near flywheel, and then the one timing on the camshaft? Anyway, a clean can't hurt. Just pop them out and use WD40? Or electrical contact cleaner ?

I'm going to do the fuel filter anyway, I like to just give it a routine service myself when I get a bike so I can ride in peace. Maybe i'll replace the TPS because it looked gunky and it's the wrong model and everyone is telling me that's what it is. I'll do them all one at a time anyway to potentially get an answer.

I'm not 100% sure what bike you have. The Cal 1100i (large computer under the passenger seat) has two. One on the top right side of the flywheel. And one on the top left side of the timing chest. WD40 is a fine cleaner. Well, a solvent on the flywheel one, as WD40 may attract dust and goop. The front one is already in oil. Do not lose the shims, and the front timing one has an o-ring that is likely hard as a rock.

[fotoguzzi]

I’ll just mention about the TPS.. it is NOT the same as the 1998 and on EV. 1997 and earlier use a TPS that is physically larger that the later version. I don’t think there is a Harley version available for that model like there is for the EV. They are not cheap!

[flower_king001]

http://www.harpermoto.com/potentiometer-b-30530501.html

new TPS from Harpers for under $100 USA

[fotoguzzi]

That’s the one, price not too bad.. wonder what shipping to Ireland will be?

[Tkelly]

TPS was my problem,never changed gas filter again.

[lad]

TPS was my problem,never changed gas filter again.

Hope i'm the same, maybe they just fail

[lad]

I’ll just mention about the TPS.. it is NOT the same as the 1998 and on EV. 1997 and earlier use a TPS that is physically larger that the later version. I don’t think there is a Harley version available for that model like there is for the EV. They are not cheap!

Thanks foto, I did find this out, it's the PC09 or something, and later ones use PF03 or something, and funny enough the newer one is on it so i'm going to switch back to what it should be, I found a few on eBay for a good price.

[lad]

http://www.harpermoto.com/potentiometer-b-30530501.html

new TPS from Harpers for under $100 USA

Thanks, I have one here on this side of the atlantic.

For anyone curious:

https://www.ebay.co.uk/itm/NEU-Ducati-TPS-Sensor-PF09-04-SBK-ST4-ST3-ST4s-SP-Poti-TP/183492007624?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2060353.m1438.l2649

[lad]

I'm not 100% sure what bike you have. The Cal 1100i (large computer under the passenger seat) has two. One on the top right side of the flywheel. And one on the top left side of the timing chest. WD40 is a fine cleaner. Well, a solvent on the flywheel one, as WD40 may attract dust and goop. The front one is already in oil. Do not lose the shims, and the front timing one has an o-ring that is likely hard as a rock.

Big box under the seat alright, P8? I'll take a look at the sensors tomorrow and keep and eye on shims and rings, thanks!

[lad]

Turns out it's not a stock filter, it's one of those UFI (chinese?) ones, but sure I may as well change it. Can it be done just by peeling away a few cables and cable ties and dropping it down a bit? Would you get in there with a spanner? Ratchet spanner?

[fotoguzzi]

UFI is the stock filter I believe. If you can undue the hoses in that position then you can slide the filter forward out of the round holder? But when I did it I think I took the bracket off the frame pulled both out and got the round bracket on the new one before mounting it up. Yeah there is not much room to work there, I forgot how tight it is.

[lad]

I forgot how tight it is.

I just did it there, it's actually grand, it's always daunting when you've never done it. I pulled away those connections, un-routed some hose connected to the frame, and there's enough room to crack the seal on the filter, then you can unscrew it with your hand nearly, once it's out of the housing it has a lot of wiggle room back and forth. I didn't have to cut any cable-ties even. Regular open-end spanners did it for me.

But!...





What does it say in the TPS/FF argument now.....??

Is there a how-to section on the forum? Took a lot of pics and videos on how do get at it because I couldn't find anything on youtube, might edit it together and put it up, do something good for once in my life

[lad]

I ordered a TPS also, PF09, the fuel filter will get here first so I'll test it before the TPS, maybe it won't need it.

[lad]

Got the filter, Mahle, german thing. I think it's a bit thinner than stock but it's so damn tight in there that nothing's going anywhere. Looking forward to seeing if it makes a difference. Not sure if that fuel pump needs a drain/refresh/back-flush? ?

[lad]

I did not, but it all flowed out of it, brown as it was

[s1120]

Well the good news is the filter is done, and off your list for maintenance. I would run the bike first to see if it fixed the issue before you do the TPS. When your following a issue, you should always do one thing at a time.

[lad]

Well the good news is the filter is done, and off your list for maintenance. I would run the bike first to see if it fixed the issue before you do the TPS. When your following a issue, you should always do one thing at a time.

Yep. That's the plan, looking forward to the next 10,000k where I don't have to change the filter.