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kagen69
Starting in the driveway
2 Posts
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 Posted - 03 Sep 2010 : 9:41:44 PM
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hi guys i was wondering if anyone could tell me how to tune a vn commodore i brought it bout 2 yrs ago but unfortunatly couldnt get it registered till recently due to finances when i got it it was running great you could barely hear its engine running.but now due to sitting so long its running rough and chewing the fuel a bit any advice on how to tune or increase the fuel econamy would be greatly appreciated pls email any advice you may have for me to kagen69@hotmail.com 
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Mechknight73
National Driver
1001 Posts
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Posted - 03 Sep 2010 : 11:35:43 PM
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Step 1; change the plugs, the oil, the filters, then check the fuel pressure regulator. This is a small metal barrel on the manifold at the back of the engine, with a vacuum lead hanging off it. Make sure the vacuum lead to it isn't damaged, and all vacuum leads going to and from the engine.
Another is the Idle Air control valve on the throttle body. Make sure it's secure and moiture free (4 pin plug on it)
Take off the air intake duct from the air cleaner, and while the engine is running, spray the throttle inside with carburettor cleaner. This will get rid of any residual carbon/sluge or other garbage clogging up its throat. If it still runs rough after all this, check each electrical connector on the engine one by one.
As a final note, if the "roughness" has a "rhythm" then it may be your ignition coil pack. If any one of the coils on the ignition is suss, one or more of the plugs may not be firing properly. |
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kagen69
Starting in the driveway
2 Posts
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Posted - 05 Sep 2010 : 2:41:47 PM
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well for the most part its running rough whilst idle but thanks for the help ill be sure to check those things |
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Mechknight73
National Driver
1001 Posts
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Posted - 05 Sep 2010 : 5:00:48 PM
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| The inside of the Idle Air Control valve is the one thing most likely to make it idle rough. You'll see it as a small hole in the side of the throttle body. When it gets choked up with carbon, it will do this, as the engine computer relies on it to control idle fuel mix and idle rpm |
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rome_rod
Learner
7 Posts
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Posted - 15 Dec 2010 : 9:15:26 PM
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quote:
Originally posted by Mechknight73
Step 1; change the plugs, the oil, the filters, then check the fuel pressure regulator. This is a small metal barrel on the manifold at the back of the engine, with a vacuum lead hanging off it. Make sure the vacuum lead to it isn't damaged, and all vacuum leads going to and from the engine.
Another is the Idle Air control valve on the throttle body. Make sure it's secure and moiture free (4 pin plug on it)
Take off the air intake duct from the air cleaner, and while the engine is running, spray the throttle inside with carburettor cleaner. This will get rid of any residual carbon/sluge or other garbage clogging up its throat. If it still runs rough after all this, check each electrical connector on the engine one by one.
As a final note, if the "roughness" has a "rhythm" then it may be your ignition coil pack. If any one of the coils on the ignition is suss, one or more of the plugs may not be firing properly.
I appreciate your posting this information. I have added this page to me list of bookmarks. I am new to the forum and still getting acquainted to the site. |
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Mechknight73
National Driver
1001 Posts
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Posted - 16 Dec 2010 : 12:00:17 AM
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| You'll find that there's almost enough info here to strip and rebuild a VN, almost to the last nut and bolt. Even if the info isn't there. someone's bound to come up with a solution |
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rome_rod
Learner
7 Posts
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Posted - 17 Dec 2010 : 2:54:34 PM
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quote:
Originally posted by Mechknight73
quote:
Originally posted by rome_rod
quote:
Originally posted by Mechknight73
Step 1; change the plugs, the oil, the filters, then check the fuel pressure regulator. This is a small metal barrel on the manifold at the back of the engine, with a vacuum lead hanging off it. Make sure the vacuum lead to it isn't damaged, and all vacuum leads going to and from the engine.
Another is the Idle Air control valve on the throttle body. Make sure it's secure and moiture free (4 pin plug on it)
Take off the air intake duct from the air cleaner, and while the engine is running, spray the throttle inside with carburettor cleaner. This will get rid of any residual carbon/sluge or other garbage clogging up its throat. If it still runs rough after all this, check each electrical connector on the engine one by one.
As a final note, if the "roughness" has a "rhythm" then it may be your ignition coil pack. If any one of the coils on the ignition is suss, one or more of the plugs may not be firing properly.
I appreciate your posting this information. I have added this page to me list of bookmarks. I am new to the forum and still getting acquainted to the site.
You'll find that there's almost enough info here to strip and rebuild a VN, almost to the last nut and bolt. Even if the info isn't there. someone's bound to come up with a solution
I appreciate that. I have been going through the threads. Like I said I have added this one to me bookmarks along with some others I found. Learning a lot. Thanks. |
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