advancing the timing
Thread Starter
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Tuned
Joined: Jun 2003
Posts: 489
Likes: 1
advancing the timing
My truck runs better with the timing advanced to about 15 degrees BTDC instead of 10. I have an emissions test I have to pass, will advancing the timing increase my chance on not passing? If I have it at 10 the idle is rough. I have been through all the tuneup stuff including a new o2 sensor.
Laughing Gas
Joined: Mar 2003
Posts: 877
Likes: 1
From: Colorado, U.S.A!
Do they check the timing during the emissions test in your area? I used to live in California and I had a truck that would only run right with the timing set at 18 deg. BTC. Even though the emissions were within limits at that setting, they always made me reset it to 10 deg. +or-2 deg. before they would pass it. Back here in the U.S.A., all they concern themselves with is what's coming out of the tailpipe.
Lead Driver
Joined: Sep 2002
Posts: 9,475
Likes: 2,009
From: North Texas
Originally posted by dbuck50
No, they don't check for timing here in IL, just CO and HC. I can't find a reason why, but my truck just won't run right at 10 BTDC...it idles rough. I'm hoping it passes this time.
No, they don't check for timing here in IL, just CO and HC. I can't find a reason why, but my truck just won't run right at 10 BTDC...it idles rough. I'm hoping it passes this time.
Hotshot
Joined: Oct 2003
Posts: 17,791
Likes: 99
From: Ashland City, TN
I dont see why timeing would effect emmissions ratio. (Edit, I"m saying "I dont see why it would be seen as a problem for the emissions test." It was just bad grammer.)
I would think they would be happier that your truck is running properly and that the emissions are withen regulations.
I would think they would be happier that your truck is running properly and that the emissions are withen regulations.
Last edited by Talyn; Nov 1, 2003 at 12:38 PM.
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Lead Driver
Joined: Sep 2002
Posts: 9,475
Likes: 2,009
From: North Texas
Originally posted by Talyn
I dont see why timeing would effect emmissions ratio.
I would think they would be happier that your truck is running properly and that the emissions are withen regulations.
I dont see why timeing would effect emmissions ratio.
I would think they would be happier that your truck is running properly and that the emissions are withen regulations.
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Senior User
Joined: Nov 2002
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From: Kelso,WA
Make sure that you disconnect the battery after you set the timing. This makes the computer relearn what changes you have made. This could very well be the reason that your truck does not idle correctly after doing a timing change. Also if you run your truck advanced beyond 10degrees initial you will most likely flunk your emissions test. This is because your computer richens the mixture of fuel to air when ever you advance your timing. Which is another completely different story. So be sure to set your timing @ factory specs. until the emissions are checked then put it back to your desired amt. They also sell a bottle of fuel additive that guarantees you will pass your emissions, You may as well try it.
Also be sure that if you tow heavy loads that you put your timing back while towing because this advancement can damage your motor under heavy loads.
PS. Dont forget to disconnect the spout connector while setting your timing
Also be sure that if you tow heavy loads that you put your timing back while towing because this advancement can damage your motor under heavy loads.
PS. Dont forget to disconnect the spout connector while setting your timing
Last edited by adamk1974; Nov 2, 2003 at 11:02 PM.
Thread Starter
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Tuned
Joined: Jun 2003
Posts: 489
Likes: 1
Would it be better to retard my timing for the emissions test? I didn't pass at 10 BTDC, but that may have been due to it not really being warmed up...only ran for about 20 minutes before the test in city driving. Right now all I want is to pass the test. I"m starting to wonder if my timing chain is stretched.
