Fuel issues?

[mjseymo]

Dear All,

 

Being following the bad cough thread with interest.

 

My situation 2001 V11. Valves set at 25mm, CO trim 0, new intake rubbers, air bleed screws and airways cleaned. Balanced with a Twinmax Idle very nicely but still coughing from just off idle to 2000rpm Tried setting the TPS to 157mv but it didn't particularly like it far happier at around 250 - 290mv. Tried putting the CO trim to +10 which helped marginally. 

 

Yesterdfay loaded thye BIN file Meinolf sent me some time ago and it improved the running greatly although it then didn't like to idle much now but the pickup through the rev range was a lot lot better and a lot less coughing around 2000rpm. So today I decided to check all the settings as per Meinolf instructed to see if it would make the bit of fine tuning for the idle. RH intlet tappet was more like 20mm than 25 but all the rest were 25mm. CO trim was still + 10 but Guzzidiag would only let put it down as low as +4. The idle was still very erratic and lumpy. The instructions from Meinolf are that the bleed screws should be all the way in. At this setting it wouldn't really tick over at all or at best 900rpm. Turning the 2.5mm cam allen key helped but too much and there would be a wait for the revs to drop once the throlle was let to close at the twistgrip/ With the TPS set to 157 not much change and it ran better with it somewhere nearer 265 - 290. 

 

Towards the end of today it's refusing to start at all. It seems like fuel starvation as you can crank it over for longer than I would like and it's trying to fire and sometimes it will and if you can keep the revs up it'll run for a short time before dying. The click from the fuel pump relay is clear but there is a continuous burbling sound of fuel seemingly going back into the tank. Could this be a faulty external fuel pump causing problems linked to this and all of the above? or is it a dody TPS potentially? Your help and advice is much appreciated as I'm really beginning to lose faith I'll ever get a V11 to run right!

 

Thanks,

 

 

Martin

 

[thumper]

You may have fouled out the plugs, pull em and replace.

Look at them closely you can tell a lot from the condition of the plugs!

[czakky]

Meinolf’s map is awesome past idle, but you have to get the idle balance soooo spot on for it to idle properly. Even then it will only idle around 1k. That’s my experience.....

[Tomchri]

Martin.

Is she running ok after 2000 ?. And Your saying pump doesnt stop after priming ? all the fuel goes thru the Return line, REGULATOR problem ?  Checked plug cables at both ends ? and Ohm 5k.

Heard of a guy over here now, had a simmilar problem, it would stall at 2000, you didnt say Yours did ? New rpm sensor fixed the problem for him.   

And like thumper said to, plugs say A lot.

My first real season With my 03 Rosso Corsa, had to go thru the Sweet little thing during Winther  , great season, tires lasted only 4360km, and today she had to come home in my van,,,,,, she only stopped charging,,,  SO DID MY HIROHITO,, ZX12 R.  Havent checked anything yet,, quessing regulator, Upgrade maybe.

Yul find it, time for another IPA.

Cheers tom.

[guzzimeister]

Hi

 

if it's running continuously, definitely a failure in the pressure reg in the return line, rare but not unknown. That would explain all the above plus non starting, as it gradually failed. Standard fuel injection part, available at a good FI specialist, needs to be set to 3.2 Bar.

 

hope this helps

 

Guzz

[fotoguzzi]

I thought the TPS should be set around 520mv at idle after setting the base line at 150. Memory sketchy but how are you coming to that TPS value?

[docc]

I thought the TPS should be set around 520mv at idle after setting the base line at 150. Memory sketchy but how are you coming to that TPS value?

That's true, yet, as it turns out, the TPS setting is what indexes the map to the throttle opening, so it is really only the baseline that is critical (with the throttle plate completely closed: no linkage, no stop screw, no high idle cam, no dirty bore).  Then the idle setting can be anywhere the bike is happy to tick over (Guzzi says 1050 +/- 50, but my Sport seems "happier" a tick or so higher.)

 

Meinolf tells us 157mV is the correct value (versus Guzzi's 150mV). I've learned to believe him.

[mjseymo]

Thanks for all your replies. I'll be getting back into the garage middle of next week.

 

The fuel regulator is no longer avaialble through Guzzi but I'll take it out and blow it out with an airline first just in case any muck has got in there. Stein Dinse show it as still be available as a Ducati item so I guess this Weber item must be standard on several injection systems. I don't suppose anyone has got a Weber part number?

 

The TPS setting has been done with the linkage disconnected. I tried to back out the 2.5mm stop screw but i'ts so rarely used and difficult to get to I'm not sure whether it turned or I just rounded the allen key hole. Will check to see what the mv is again and with new plugs we'll see what happens, I'll let you know!

[docc]

Martin,

 

When setting the TPS, the right side stop screw must be completely backed out. many of us simply leave it that way and only use the left stop screw for idle RPM setting. Also,  the high idle cam must be released underneath the right throttle body to allow the right throttle plte tp cose fully before setting the TPS baseline.

 

See image #2 in Decent Tune-up .

[JBBenson]

It's insane how sensitive the V11 is to the TPS initial setting. If it's only a tiny bit off, the bike won't run properly. Took me a while to believe it.

[Chuck]

Au contrair mon ami.. the Mighty Scura was out in SoCal for years without a tuneup and ran "fine." When I brought it home, I checked the TPS, and it was some crazy number like 340. (!) It runs beautifully, now.. the little hesitation it used to have at about 2400 at very light throttle is gone. When checking it when trouble shooting during "the incident" at the Spine Raid, it was 145. Still runs fine, haven't made time to reset it.

[mjseymo]

Well everyone success, although I haven't been out on a ride yet. 

 

New plugs. Took the fuel pressure regulator out and clenaed it with a bit of petrol and an airline.There was a bit of dirt in there but nothing excesive. Realised that previoiusly I hadn't compeltely realeased the rough idle cam on the right hand side and managed to get a quality 2.5mm hex socket to back off competely the screw. With the linkage disconnected the TPS was reading 11mv, With that corrected and the other bits done too you can imagine whtat a differecne it made. With the LH 2.5mm hex wound in a little bit it will idle evenly at 1100 - 1200 rpm even with the Meinolf map and the pressure regulator is working properly too. 

 

Now to sort out the broken heat sensor on the municipal police 750 breva (compelte with extendabel rear light and sirens. (having talked to Piaggio these were meant to be removed by the de-comissioners before allowing into public service, lucky me)

[fotoguzzi]

[mjseymo]

Went out to the Bucks branch MG club meet which is about 50 minutes riding time each way on a variety of roads from fast duel carriageway to a lot of country lanes and it didn't cough once. Still can't quote believe it. That's the first time in 5 years!

[Chuck]

They tell me patience is it's own reward..