TPS Questions

[GK]

Hi All,

Anyone had a crook TPS?

If so, what were the symptoms?

I set the TPS to 150Mv as per the factory manual. It barely started but coughed and spluttered and backfired. We tested it again and the reading had changed to 148Mv. Next we opened and shut the throttle a few times and it moved again, this time to 142Mv. Is the TPS stuffed you reckon?

Also, would anyone have a Magneti Marelli PF3C TPS spare, or know where to source one? A bloke here in Aus put me onto bikesportdevelopments.co.uk which had a similar unit, but unfortunately isn't compatible with my 2001 Monster.

Any ideas?

GK

[BastrdHK]

post in tech for more help.

[Howie]

I wouldn't worry about such small changes in value at closed throttle.  What was the reading before you reset the TPS?  If there was enough change you may need to reset CO trim.

[rule62]

Just to be certain... you're setting to 150mV with TB's fully closed and then adjusting to proper mV / TB degree at idle, correct? I do not have software, so I only use mV and it works really well.

Check this site for the proper mV TB degree for your bike.

http://bikeboy.org/ducati2vthrottleb.html

A few mV variance like you mentioned (150-142) is not going to make a helluva difference at all. You'll get that variance depending on how hard you let the TB's snap closed. But if you're trying to have the bike idle at only 150 mV... then there's the problem. Your bike should be idling somewhere between 404 and 462 mV according to Brad's site.

[GK]

OK. Got the new (second hand) TPS. Got it installed. Have managed to get it set at 147ish. Darn sensitive little mongrel!

For idle 1,100 - 1,200 rpm, the manual says 520-560mv +-2Mv. So you set the tps at 150Mv then use the throttle stop screws to gain that 520-560Mv (on a 1.5 computer) value.

On a 1.6 computer the final value is 420-460Mv.

This is according to LT Snyder's recommendations.

The factory manual (for the 1.5 computer) also gives the same 150Mv +-15Mv, then 403Mv using the throttle stop screw.

I'm guessing my sweet spot will be somewhere around there.

I'm just charging up the battery now, I've run it flat again! 

I'll keep you posted.

God willing, all will be sweet!

GK

[1.21GW]

Just make sure when you're done you fill out a TPS report.

[GK]

Just make sure when you're done you fill out a TPS report.

LOL!

Bike had trouble starting so I changed the filthy black plugs. Going!

Got the idle screw to 390oddMv but the bike ran terrible with that setting, so I screwed it back up until it was no longer in play. Ran much better without almost constant backfiring.  

Once it warmed up the idle was hanging around 1,750rpm on the over run. Making the mixture a little richer with the bleed screws seemed to stop that. So far so good.  

Went for the obligitory test ride. Not running too well under 4K, popping and backfiring, but at least it was idling strongly and not need to be kept alive by working the throttle.

So I guess we're in the ballpark now and have something to work with! Much better than a bike that wouldn't start or needed contant throttle work to keep it alive.

Now I've run out of tinkering time for a few days as the schedule is full. Charger is back on to get the battery back up to scratch, and I'll continue when I next get a chance in a few days time. Hopefully the brother will be around to give me a hand.

Cheers,

GK

[jerryz]

is your battery and charging system tip top because if it is only a litle weak you will get bad running on an S4 regardless of how good the TPS is .

[GK]

Mine's not an S4.

Thanks for posting though.

GK

[krista]

IMHO, the declining mV reading could be due to the battery slowly discharging. We'll be getting in our PF3Cs in November. Along with PF1C, PF09, and IPF2/CB TPSs. And matched iwp043 injectors. Lots of goodies for the early injected Monsters that are starting to give their owners fits.

-Chris

[GK]

IMHO, the declining mV reading could be due to the battery slowly discharging. We'll be getting in our PF3Cs in November. Along with PF1C, PF09, and IPF2/CB TPSs. And matched iwp043 injectors. Lots of goodies for the early injected Monsters that are starting to give their owners fits.

-Chris

That's good news about the TPS units Chris. Any ideas on price at this stage?

GK

[krista]

Tentative MSRP pricing on our soon to be launched EFI products will be:

• PF1C: $61.69
• PF3C: $79.85
• IPF2C/B: $61.91
• PF09: $80.81
• iwp043 sold as matched pair: $199.89  (or $99.95 ea)
• FPR (fuel pressure regulator, 3.0 or 3.5 bar): $44.93

And the usual satisfaction guaranteed, no problems free* replacement, available via your local dealer and if not, please tell them, blah blah blah.

Thanks,
Chris

*-In the US of A, free includes free shipping. Elsewhere, shipping charged on case by case basis.

[GK]

Tentative MSRP pricing on our soon to be launched EFI products will be:

• PF1C: $61.69
• PF3C: $79.85
• IPF2C/B: $61.91
• PF09: $80.81
• iwp043 sold as matched pair: $199.89  (or $99.95 ea)
• FPR (fuel pressure regulator, 3.0 or 3.5 bar): $44.93

And the usual satisfaction guaranteed, no problems free* replacement, available via your local dealer and if not, please tell them, blah blah blah.

Thanks,
Chris

*-In the US of A, free includes free shipping. Elsewhere, shipping charged on case by case basis.

Thanks Chris. 

GK

[koko64]

We set the TPS using a combination of Brad's instructions on his site, LT Snyders method and the factory manual. Had to remove the airbox to get to the LH throttle body adjustment screw, then reconnect the battery and ignition gear, the battery sitting on the rear head and ignition gear hanging from a bungee off the tank latch. I then synched the throttle bodies and set the bleed screws.
It starts and runs much much better now.

The bike was allegedly serviced by an out of state dealer. I can tell you that everything that could be adjusted incorrectly was adjusted way out of spec. I don't know what those guys were smoking, everything was way off.
My bro is testing different bleed screw settings, doing plug chops and testing open and stock airbox lids. Must be a DP ECU or map because it runs better plug colors with an open airbox and is still on the rich side, but ok. The bike has cored pipes.
My Gixxers fuel injection is a piece of cake to work on in comparison. You'd swear Marelli make it as hard as possible for the DIYer.

It was a good learning experience for my bro as he gets to know his bike and it's servicing requirements. It was a good brother project too.

[GK]

It was a good learning experience for my bro as he gets to know his bike and it's servicing requirements. It was a good brother project too.

True and true!

GK