Ducati Monster Forum

powered by:

March 28, 2024, 05:50:37 AM *
Welcome, Guest. Please login or register.

Login with username, password and session length
News: Welcome to the DMF
 
   Home   Help Search Login Register  



Pages: [1] 2   Go Down
  Print  
Author Topic: 800 Hesitation, Bogging, and low idle. Long post.  (Read 9561 times)
thorn14
Sr. Member
****
Offline Offline

Posts: 412



« on: July 30, 2013, 10:43:21 AM »

My bike idles around 900 warm but is fairly steady. Around 3k it starts to hesitate and bog down. If I rev past it I seem to hit a wall again around 6k.

It is an 800ss in the monster 620 frame. (Recent swap.) It has open airbox, silmoto slipons, and a dp ecu reflash for the larger engine. It MAY have had this issue before, but with the other more noisy issues with my 620 engine, I couldn't ride to verify. I did however, do a lot of fuel tank swapping because of leaks.

I've changed the fuel filter and spark plugs. Pump primes, doesn't stall once warmed up. Fuel lines unkinked and clear. The fuel lines/injectors are the only things that sat at all for about 4-5 months. The tank was emptied and repaired for leaking. Had used old gas to fire up the 620 a month ago, but fresh gas last night for the 800. I've run only a quarter tank through it with a little techron, but unless I am advised to run a tank or more, I'll move on.

I checked my valves before I put the engine in, and got the openers within spec, and the closers are all just at the limit of too loose (Around .002) I read that too loose may cause low idle. I planned on adjusting these after verifying this engine actually ran and doing an oil change. It so far is my first next step just to rule it out. Belts were also changed and adjusted.

With the ecu reflash, is it possible my TPS, and air/fuel may just need adjusting? I'm skeptical because on the 620 it ran fine albeit lean before mapping, and currently it's unbearable.

I'm assuming then, that there is either a mapping issue, or it's fuel related. Post valves, I'm lost as to what to start checking first. I know fuel filter and spark plugs are the top of the list for these issues, then what is the next best bet? From what research I've done, it's verifying injectors are clear and spray a fine mist (I can hear them clicking with a stethoscope), checking wiring for the coils for proper voltage, and then TPS, throttle body sync, and verifying fuel lines are connected properly inside.

Thanks for any help, you guys tend to catch shit I miss or haven't yet had the opportunity to learn  bang head
Logged

M620 turned M800 but then back to M620 after the M800 died at 110k, and now to Multi 1000.
Howie
Post Whore
******
Offline Offline

Posts: 16807



« Reply #1 on: July 30, 2013, 10:58:21 AM »

Definitely set the TPS, CO and synch and idle speed before doing anything else, TPS first since, if that is off the computer has no idea where your throttle is.  Oh, I assume you changed the fuel filter.
Logged
brad black
Hero Member
*****
Offline Offline

Posts: 2066


WWW
« Reply #2 on: July 31, 2013, 04:12:12 AM »

check if the 620 and 800 have the same tps reset value.

actually, scrap that.  620 has a non linear tps, 800 linear.  fit a linear tps if you still have the 620 throttle bodies and start again.  tps reset will be required.
Logged

Brad The Bike Boy

http://www.bikeboy.org
thorn14
Sr. Member
****
Offline Offline

Posts: 412



« Reply #3 on: July 31, 2013, 06:35:59 AM »

I just was checking your site and noticed in the procedure it only was mentioning 620 for non-linear, so that provides the confirmation I was just going to ask about as I was double checking everything swapped over.

I'll try that first.
Logged

M620 turned M800 but then back to M620 after the M800 died at 110k, and now to Multi 1000.
krista
... does she have a
Hero Member
*****
Offline Offline

Posts: 611

ducati addict


WWW
« Reply #4 on: August 01, 2013, 12:43:31 AM »

@thorn14, please call my shop sometime in the mid-afternoon California time so we can BS about this.
Logged

Krista Kelley ... autist formerly known as chris
official nerd for ca-cycleworks.com
thorn14
Sr. Member
****
Offline Offline

Posts: 412



« Reply #5 on: August 01, 2013, 04:06:17 PM »

Had a chat with chris earlier, and from that conversation was reminded that mixing and matching of bike parts from various years and sizes can cause headaches. Grin

I checked an 800 wiring diagram with the ecu pinouts vs my 620's and all match up except for body pin 33 which is for the clutch safety switch. (I can barely read the low quality jpg and it looks like body pin 33, already dealt with this if it is the case).

I don't have access to my 620 ecu any longer as I sold it to help cover the cost of the engine, so I'm working with the 800 flash now. (Still have a complete 620 engine  Wink for cheap).

I have a linear tps on it's way to try to make work. I'm assuming connectors are the same, and it should just need to be swapped. Then reset. I have cables and VDST software, but when it was a 620, I could never make it connect and I'm not confident it will magically work now. So the "if it will run" factor is a big question to be able to get it somewhere to reset, let alone get to run right.

So after I try some more frankenstein work in a day or two, I'll have an update on what happens. Thanks everyone.
Logged

M620 turned M800 but then back to M620 after the M800 died at 110k, and now to Multi 1000.
brad black
Hero Member
*****
Offline Offline

Posts: 2066


WWW
« Reply #6 on: August 02, 2013, 05:20:28 AM »

the biggest issue for vdst connection is battery voltage.  so put it on a charger to bump up the voltage before you connect.

i'd do the throttle opening baseline setting, as that's the only way you can reference the idle throttle setting reliably and you need it to be accurate.  but after that and an idle mixture set it should be fine.
Logged

Brad The Bike Boy

http://www.bikeboy.org
thorn14
Sr. Member
****
Offline Offline

Posts: 412



« Reply #7 on: August 02, 2013, 07:14:12 AM »

What do you mean by throttle opening baseline setting? Is that syncing the throttle bodies?
Logged

M620 turned M800 but then back to M620 after the M800 died at 110k, and now to Multi 1000.
DarkMonster620
According to some, a bottomless pit eating machine
Post Whore
******
Offline Offline

Posts: 37932


Enjoying the ride


WWW
« Reply #8 on: August 02, 2013, 09:27:56 AM »

<snip> I have cables and VDST software, but when it was a 620, I could never make it connect and I'm not confident it will magically work now. <snip>

do not upgrade to the newer Centurion software if you have a VDSTS tool . . . !!!!

they have uploaded some self help documents on their website, for non connection issues, but, battery voltage must be at least 12.5V . . .
Logged

Carlos
I said I was smart, never that I had my shit together
Ducati is the pretty girl that can't walk in heels without stumbling. I still love her.
"When you have eliminated all which is impossible, then whatever remains, however improbable, must be the truth."
sleepyJ
Jr. Member
**
Offline Offline

Posts: 75



« Reply #9 on: August 03, 2013, 03:30:33 PM »

  Oh, I assume you changed the fuel filter.
Logged

'00 m900i.e.
brad black
Hero Member
*****
Offline Offline

Posts: 2066


WWW
« Reply #10 on: August 03, 2013, 11:47:53 PM »

What do you mean by throttle opening baseline setting? Is that syncing the throttle bodies?

no

http://www.bikeboy.org/ducatitps.html
Logged

Brad The Bike Boy

http://www.bikeboy.org
thorn14
Sr. Member
****
Offline Offline

Posts: 412



« Reply #11 on: August 04, 2013, 07:18:23 AM »

no

Gotcha!

Well I swapped it in and it fired up and appeared to run much better than with the non-linear tps. I took it for a test ride and all my symptoms were gone. It runs beautifully now. So I'll get the tps reset and be on my way.  Dolph I haven't had my own bike since February so I'm beyond excited.

Thanks everyone!
Logged

M620 turned M800 but then back to M620 after the M800 died at 110k, and now to Multi 1000.
krista
... does she have a
Hero Member
*****
Offline Offline

Posts: 611

ducati addict


WWW
« Reply #12 on: August 06, 2013, 11:39:57 AM »

OMG YAAAY! Man, if your bike isn't misbehaving -- and also getting good MPG, I'm tempted to say dont' reset the tps. Leave it happy.

I only advise this given the franken-nature of your efi system. Normally, I'd be all over telling people to reset it. And having myself waved the voodoo wand over a grumpy efi Monster that refuses to behave is what motivates that advice...

Chris
Logged

Krista Kelley ... autist formerly known as chris
official nerd for ca-cycleworks.com
thorn14
Sr. Member
****
Offline Offline

Posts: 412



« Reply #13 on: August 08, 2013, 11:10:02 AM »

You have no idea how much I'd love to just leave as is.

As is, after a couple days commuting, I have noticed steady throttle in the 3-5k area has a little popping and hesitation. Above that it's fine. I fixed the exhaust leak, couldn't connect my VDST (no surprise), and the fuel filter had already been changed.

I never got the tps reset on the 620 (same filter/exhaust) when I had that reflashed and I had minor popping, that was fine, on the new 800, it's slightly louder and harder to ride around daintily in traffic.

So I'm leaning towards a reset, then starting the diagnosing process.
Logged

M620 turned M800 but then back to M620 after the M800 died at 110k, and now to Multi 1000.
krista
... does she have a
Hero Member
*****
Offline Offline

Posts: 611

ducati addict


WWW
« Reply #14 on: August 08, 2013, 08:00:40 PM »

Yeah, but a VDSTS (or other) connection is required to reset the TPS. Tongue  If you could connect, I'd suggest first bumping up the trim adjustment to see if that can make the flat spot better...
Logged

Krista Kelley ... autist formerly known as chris
official nerd for ca-cycleworks.com
Pages: [1] 2   Go Up
  Print  
 
Jump to:  


Powered by MySQL Powered by PHP Powered by SMF 1.1.21 | SMF © 2015, Simple Machines
Simple Audio Video Embedder
Valid XHTML 1.0! Valid CSS!
SimplePortal 2.1.1