998 won't start if I wait after turning on ignition - Ducati.ms - The Ultimate Ducati Forum
Reply
 
LinkBack Thread Tools Display Modes
post #1 of 11 (permalink) Old Jul 22nd, 2019, 9:44 am Thread Starter
Senior Member
 
Lelebebbel's Avatar
 
Join Date: Nov 2017
Location: Campbell River, BC, Canada
Posts: 125
Garage
998 won't start if I wait after turning on ignition

Is this some sort of leak in the fuel system or is it normal? It starts every time, if I crank right after it finishes priming. If I wait 20 seconds, it cranks but doesn't start. I turn the key off and on again, it primes again, and then it starts.

Battery is good, and I have big fat starter cables etc.

- 2002 998
- 1994 900SS-CR
Lelebebbel is offline  
Sponsored Links
Advertisement
 
post #2 of 11 (permalink) Old Jul 22nd, 2019, 10:08 am
Junior Member
 
blitzboy54's Avatar
 
Join Date: Jun 2018
Posts: 12
Check your clutch basket. If it's already open great if not take the cover off. Put the bike in the condition where it won't start. Watch the basket turn went he engine turns over. If it doesn't rotate smoothly or at the same rate as the crank you have a starter clutch on it's way out.

2005 Ducati SR4
Upstate NY
blitzboy54 is offline  
post #3 of 11 (permalink) Old Jul 22nd, 2019, 10:18 am
Senior Member
 
Sherpa23F's Avatar
 
Join Date: May 2017
Location: Denver, Colorado, USA
Posts: 505
Garage
That's normal on my 998R. The ECU times out after a certain time interval (I think it's 15 seconds) and won't put fuel in when the bike is cranking. Turn off the key and turn back on and it should be good to go.

It doesn't have any kind of leak and it has always done it.
Tripod and ProphetPVD like this.

1996 900 SS/SP #C22, 1996 916 Corsa (ex-Ferracci), 1998 916 SPS #774, 1999 748R (race), 2001 996R (US), 2001 996R (Euro), 2002 998R #481, 2011 848 EVO (race), 2008 1098R #262, 2014 1199 Superleggera #213

Last edited by Sherpa23F; Jul 22nd, 2019 at 11:11 am.
Sherpa23F is offline  
 
post #4 of 11 (permalink) Old Jul 22nd, 2019, 10:37 am
Senior Member
 
Strega's Avatar
 
Join Date: Apr 2008
Location: Proctor, VT, USA
Posts: 591
Quote:
Originally Posted by Lelebebbel View Post
Is this some sort of leak in the fuel systeml?.
Likely. When you turn the key the ECU turns on the fuel pump to build pressure in the system, then turns off. It then waits for a signal from the crank rotation sensor that tells the ECU that the engine is running and to turn the pump back on.

If you have a leak in a fuel line (most likely inside the tank) you'll depressurize the system quickly and without fuel pressure it won't start. Replace the fuel lines with Gates or NAPA submersible hose or hose that exceeds the SAE 30R10 specification for submersible fuel line hose.
Strega is offline  
post #5 of 11 (permalink) Old Jul 22nd, 2019, 1:30 pm Thread Starter
Senior Member
 
Lelebebbel's Avatar
 
Join Date: Nov 2017
Location: Campbell River, BC, Canada
Posts: 125
Garage
I'm getting some mixed signals here.. the fact that the fuel pump re-primes makes me think that the system maybe does lose pressure though. So time to open the tank before something fails? Any other 998 owners that can confirm this isn't a normal behavior?

It doesn't have anything to do with the starter or sprag. The engine turns over just fine, it just doesn't fire unless I turned the ignition on within 10 seconds or so of starting.

- 2002 998
- 1994 900SS-CR
Lelebebbel is offline  
post #6 of 11 (permalink) Old Jul 22nd, 2019, 2:56 pm
Senior Member
 
Strega's Avatar
 
Join Date: Apr 2008
Location: Proctor, VT, USA
Posts: 591
Open the tank and check if you can see ripples on the fuel surface when the pump primes a good indication of a hose split or connection leak. Fuel line splits in the tank on early 9xx series bikes is not uncommon.
Attached Thumbnails
Click image for larger version

Name:	Picture 2019-07-22 at 3.56.05 PM.jpg
Views:	13
Size:	153.7 KB
ID:	949201  
Strega is offline  
post #7 of 11 (permalink) Old Jul 22nd, 2019, 4:06 pm
Senior Member
 
Join Date: Jul 2018
Posts: 1,029
i'd check the fuel pressure and see if it has enough, if it maintains the pressure and what it does when you crank it after having the key on. i thought they won't even crank if you go past the 15 seconds, but i don't recall now.

know all wanker
belter is online now  
post #8 of 11 (permalink) Old Jul 22nd, 2019, 5:21 pm
Prolific Poster Award
 
SS904's Avatar
 
Join Date: Sep 2004
Location: Coventry, CT, USA
Posts: 5,538
Garage
As someone already said, it times out. My ST4s does it too after 15 or 20 seconds, same ECU. The older 1.6M bikes don't do it. Cycle the key off then on. If there was a fuel leak causing pressure to drop, I'd think it would show when running too.
Tripod and Nikk11 like this.

Dan. "Painfully mistaking my big talk for the truth" Samantha Fish.
2003 ST4s (The Truck)
1995 916 (Junk Yard Dog)
SS904 is offline  
post #9 of 11 (permalink) Old Jul 22nd, 2019, 5:55 pm
Senior Member
 
Strega's Avatar
 
Join Date: Apr 2008
Location: Proctor, VT, USA
Posts: 591
Quote:
Originally Posted by SS904 View Post
As someone already said, it times out. My ST4s does it too after 15 or 20 seconds, same ECU. The older 1.6M bikes don't do it. Cycle the key off then on. If there was a fuel leak causing pressure to drop, I'd think it would show when running too.
Yup, I'm wrong. Owners Manual.
Attached Thumbnails
Click image for larger version

Name:	Picture 2019-07-22 at 6.53.48 PM.jpg
Views:	28
Size:	442.5 KB
ID:	949211  
Strega is offline  
post #10 of 11 (permalink) Old Jul 23rd, 2019, 8:48 pm
Senior Member
 
Join Date: Jul 2018
Posts: 1,029
i checked a 998 i had in yesterday. cranks, but won't fire if left for more than 15 seconds.

know all wanker
belter is online now  
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Ducati.ms - The Ultimate Ducati Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome