Page Loading... please wait!


This message not going away?
Ensure Javascript is on and click the box
Unregistered? Register for a user account. Home :: Downloads :: Submit News :: Reviews :: FAQ   

Online

There are 66 unlogged users and 0 registered users online.

You can log-in or register for a user account here.

Languages

Preferred language:



Post new topic   Reply to topic
View previous topic Printable version Log in to check your private messages View next topic
Author Message
daywilmOffline
Post subject: My V12 Is Only About a V8 Or So  PostPosted: Jan 31, 2017 - 11:15 PM
KitCentral Fellow


Joined: Nov 22, 2009
Posts: 264
Location: Tulsa, Oklahoma
Status: Offline
Well guys, I thought I had this thing beat, but today I discovered I really don't. The engine starts easily and revs freely (I don't have a tach on it but I'm sure I'm getting way over the 3000 rpm typical of limp mode). In fact, as I said, it runs so well that I thought I was home free. I was working on the exhaust today when I noticed that the output from the muffler (oem off of a Diablo 6.0) on one side was louder than the other. Upon closer look I noticed that one side was pushing considerable more air than the other. After running it for awhile I shut it off and felt the exhaust manifolds. Driver's side was hotter than a pistol but the passenger side was only warm. I think this tells me that I'm only firing on a portion of the cylinders on the passenger side (1-6). I'm not sure where to start diagnosing this. Anybody have any ideas?
 
 View user's profile Send private message Send e-mail  
Reply with quote Back to top
AdrianBurtonOffline
Post subject: RE: My V12 Is Only About a V8 Or So  PostPosted: Feb 01, 2017 - 12:34 AM
KitCentral Fellow


Joined: Jul 22, 2003
Posts: 1730
Location: Mooresville, NC
Status: Offline
LOOK AT YOUR FUEL PUMPS, IF YOU ARE RUNNING THE STOCK SET UP ONE CAN BE DEAD

_________________
Now building in Mooresville NC
http://www.flickr.com/photos/adrianburton
http://profile.imageshack.us/user/AdrianBurton
http://s997.photobucket.com/albums/af91/AdrianBurton/
 
 View user's profile Send private message Send e-mail Visit poster's website  
Reply with quote Back to top
AdrianBurtonOffline
Post subject: RE: My V12 Is Only About a V8 Or So  PostPosted: Feb 01, 2017 - 12:34 AM
KitCentral Fellow


Joined: Jul 22, 2003
Posts: 1730
Location: Mooresville, NC
Status: Offline
...FYI YOU CAN RUN THE ENGINE ON JUST ONE PUMP

_________________
Now building in Mooresville NC
http://www.flickr.com/photos/adrianburton
http://profile.imageshack.us/user/AdrianBurton
http://s997.photobucket.com/albums/af91/AdrianBurton/
 
 View user's profile Send private message Send e-mail Visit poster's website  
Reply with quote Back to top
daywilmOffline
Post subject: RE: My V12 Is Only About a V8 Or So  PostPosted: Feb 01, 2017 - 12:56 AM
KitCentral Fellow


Joined: Nov 22, 2009
Posts: 264
Location: Tulsa, Oklahoma
Status: Offline
Thanks Adrian. I am only using one fuel pump (an MSD unit - the same one used by Jim Dinner). The strange thing is that the exhaust manifold on the passenger side does warm up (so I'm getting some action on that side) but it doesn't get too hot to touch like the driver side.
 
 View user's profile Send private message Send e-mail  
Reply with quote Back to top
76mxOffline
Post subject: RE: My V12 Is Only About a V8 Or So  PostPosted: Feb 01, 2017 - 03:31 AM
Senior Member


Joined: Jun 09, 2013
Posts: 121
Location: Fort Worth, Texas
Status: Offline
A $30 temp gun from Harbor Freight is an excellent diagnostic tool for things like this, might save your fingertips as well.
 
 View user's profile Send private message  
Reply with quote Back to top
daywilmOffline
Post subject: RE: My V12 Is Only About a V8 Or So  PostPosted: Feb 01, 2017 - 03:07 PM
KitCentral Fellow


Joined: Nov 22, 2009
Posts: 264
Location: Tulsa, Oklahoma
Status: Offline
I actually have one of those but at the time I didn't think about it. I just stuck my hand down there and as you can imagine, it was hot! (At least on one side!)
 
 View user's profile Send private message Send e-mail  
Reply with quote Back to top
AdrianBurtonOffline
Post subject: RE: My V12 Is Only About a V8 Or So  PostPosted: Feb 01, 2017 - 04:27 PM
KitCentral Fellow


Joined: Jul 22, 2003
Posts: 1730
Location: Mooresville, NC
Status: Offline
That does sound like it is in limp home mode.... if I am not mistaken it is looking for a signal from the trans...

_________________
Now building in Mooresville NC
http://www.flickr.com/photos/adrianburton
http://profile.imageshack.us/user/AdrianBurton
http://s997.photobucket.com/albums/af91/AdrianBurton/
 
 View user's profile Send private message Send e-mail Visit poster's website  
Reply with quote Back to top
daywilmOffline
Post subject:   PostPosted: Feb 01, 2017 - 05:09 PM
KitCentral Fellow


Joined: Nov 22, 2009
Posts: 264
Location: Tulsa, Oklahoma
Status: Offline
I don't have the original auto trans, replaced it with a 5 speed from a Porsche Boxster. So I'm not sure what signal I can provide. I'm basically following Jim Dinner's method and if I'm not mistaken he terminated all the trans connections from X20/X21. But if you have another theory I'm willing to listen!
 
 View user's profile Send private message Send e-mail  
Reply with quote Back to top
AdrianBurtonOffline
Post subject:   PostPosted: Feb 02, 2017 - 08:39 PM
KitCentral Fellow


Joined: Jul 22, 2003
Posts: 1730
Location: Mooresville, NC
Status: Offline
Did you look at Simon Appleby's (BODGER) build

he used the OEM setup also.. he may have some other info because I am thinking that there are subtle differences depending on the year

_________________
Now building in Mooresville NC
http://www.flickr.com/photos/adrianburton
http://profile.imageshack.us/user/AdrianBurton
http://s997.photobucket.com/albums/af91/AdrianBurton/
 
 View user's profile Send private message Send e-mail Visit poster's website  
Reply with quote Back to top
daywilmOffline
Post subject:   PostPosted: Feb 02, 2017 - 11:40 PM
KitCentral Fellow


Joined: Nov 22, 2009
Posts: 264
Location: Tulsa, Oklahoma
Status: Offline
I have looked closely at Simon's website but it has been a while so I'll go back over it to see if I can pick up anything I missed. Rodney has put me onto a couple of things to check so I just need to get to work on it. Any other things that come to mind, let me know.
 
 View user's profile Send private message Send e-mail  
Reply with quote Back to top
Richard454Offline
Post subject:   PostPosted: Feb 03, 2017 - 02:07 PM
Member


Joined: Mar 06, 2010
Posts: 36
Location: Atlanta, GA
Status: Offline
A couple things to look at-

Fuel pressure regulator on the fuel rails- as the OEM has two. If the regulator is "leaking" and not holding enough pressure- the injectors won't spray correctly.

The other thing to check is the injectors themselves. I had one cylinder running about 40º hotter than the others. Pulled the injector and it was not spraying like it should.

Richard
 
 View user's profile Send private message  
Reply with quote Back to top
daywilmOffline
Post subject:   PostPosted: Feb 03, 2017 - 03:28 PM
KitCentral Fellow


Joined: Nov 22, 2009
Posts: 264
Location: Tulsa, Oklahoma
Status: Offline
Thanks. I'll check into that. How did you measure the temperature of each cylinder?
 
 View user's profile Send private message Send e-mail  
Reply with quote Back to top
88.5countachOffline
Post subject:   PostPosted: Feb 03, 2017 - 05:43 PM
KitCentral Fellow


Joined: Feb 26, 2010
Posts: 293
Location: Cambridge, Ontario, Canada
Status: Offline
daywilm wrote:
Thanks. I'll check into that. How did you measure the temperature of each cylinder?


I'm no mechanic but I think you can check it with one of those laser temp readers on the exhaust header. They are cheap now.

_________________
https://lamborghinicountachreplica.wordpress.com/
 
 View user's profile Send private message Send e-mail Visit poster's website  
Reply with quote Back to top
daywilmOffline
Post subject:   PostPosted: Feb 04, 2017 - 08:47 PM
KitCentral Fellow


Joined: Nov 22, 2009
Posts: 264
Location: Tulsa, Oklahoma
Status: Offline
I thought I'd provide an update of what I've found so far. I got a Noid light and was able to determine that the injector electronics are all working on the driver side (cyl. 7-12) but not on the passenger side (cyl. 1-6). I swapped the computers to see if I might have a bad DME but the result was the same so I don't think it is in the DME computer. As I've said before, it revs freely so I don't really think there is anything wrong with the EML either. Besides, the 750il I took the engine from ran before I pulled the motor. So, I've got something wrong in the injector wiring for the passenger side.
 
 View user's profile Send private message Send e-mail  
Reply with quote Back to top
jdinnerOffline
Post subject:   PostPosted: Feb 05, 2017 - 01:45 AM
KitCentral Fellow


Joined: Nov 10, 2003
Posts: 3073
Location: Toronto, Ontario, Canada
Status: Offline
Inside the relay box from the right side inner fender you'll find fuel pump relays and main relays. ALL of these need to be powered up. This sounds like your problem.

_________________
Visit http://jimdinner.wordpress.com/
 
 View user's profile Send private message Send e-mail Visit poster's website  
Reply with quote Back to top
Display posts from previous:     
Jump to:  
All times are GMT - 8 Hours
Post new topic   Reply to topic
View previous topic Printable version Log in to check your private messages View next topic
Powered by PNphpBB2 © 2003-2006 The PNphpBB Group
Credits
 
Page created in 0.75962901115417 seconds.