81 First time timing - a little help
Thread Starter
Pro
Joined: Aug 2000
Posts: 573
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From: Alpharetta GA
81 First time timing - a little help
Hi all,
gonna set this timing myself today and see if I can t pass the NOX emissions test. I know my timing is advanced and this may be my problem.
Question - when I hook up the light can I just hook the red to battery positive , black to battery negative and the green to spark plug wire #1.??
I already unhooked the 4 wire connector at the distributor.......
is that all there is...
BTW, with the car stopped the mark on the dampner is lining up with
10 degrees BTC......
Thanks
Kevin
[Modified by ksems, 12:33 PM 3/16/2002]
gonna set this timing myself today and see if I can t pass the NOX emissions test. I know my timing is advanced and this may be my problem.
Question - when I hook up the light can I just hook the red to battery positive , black to battery negative and the green to spark plug wire #1.??
I already unhooked the 4 wire connector at the distributor.......
is that all there is...
BTW, with the car stopped the mark on the dampner is lining up with
10 degrees BTC......
Thanks
Kevin
[Modified by ksems, 12:33 PM 3/16/2002]
Drifting
Joined: Aug 1999
Posts: 1,468
Likes: 1
From: Kirkland WA
Re: 81 First time timing - a little help (ksems)
Sounds like you're missing a cable?
Red goes to power -- you can use the power off the back of the alternator
Black goes to ground - any ground is fine or you can use the alternator bracket
The little green clamp goes on the + side of the coil if you're checking dwell. You don't need this with HEI distirbutor.
There should be a big, black plastic clamp with a square hole in the middle. THAT goes on the #1 wire. Also -- make sure you pull that wire away from the others so you don't get feedback.
Good luck!
Red goes to power -- you can use the power off the back of the alternator
Black goes to ground - any ground is fine or you can use the alternator bracket
The little green clamp goes on the + side of the coil if you're checking dwell. You don't need this with HEI distirbutor.
There should be a big, black plastic clamp with a square hole in the middle. THAT goes on the #1 wire. Also -- make sure you pull that wire away from the others so you don't get feedback.
Good luck!
Pro
Joined: Feb 2002
Posts: 543
Likes: 0
From: nyc ny
Re: 81 First time timing - a little help (ksems)
that and loosen the distributor bolt a little so that you can turn it. bring it to spec and your done in that dept :yesnod: :cool:
[Modified by One GM A Tech, 2:22 PM 3/16/2002]
[Modified by One GM A Tech, 2:22 PM 3/16/2002]
Thread Starter
Pro
Joined: Aug 2000
Posts: 573
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From: Alpharetta GA
Re: 81 First time timing - a little help (Corellian Corvette)
went and got another timing light.....the one I had had a bad bulb and didnt look in very good shape.
I now have
black wire
red wire
big black clamp
should be good to go :D
Thanks
I now have
black wire
red wire
big black clamp
should be good to go :D
Thanks
Thread Starter
Pro
Joined: Aug 2000
Posts: 573
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From: Alpharetta GA
Re: 81 First time timing - a little help (ksems)
by the way....for those who dont know , I failed the NOX test at emissions
and was looking at the timing ( possibly advanced )
as the problem.
I know the mechanic that did the tuneup last year said he advanced the timing......dont know what it was before he did that though.
Kevin
and was looking at the timing ( possibly advanced )
as the problem.
I know the mechanic that did the tuneup last year said he advanced the timing......dont know what it was before he did that though.
Kevin
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Thread Starter
Pro
Joined: Aug 2000
Posts: 573
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From: Alpharetta GA
Re: 81 First time timing - a little help (Corellian Corvette)
6 degrees is what the sticker in the car says it should be at...
would advancing it be a smaller number ( like 4 degrees BTC? )
and retarding it would be larger ( like 8 degrees BTC? )
Kevin
[Modified by ksems, 3:15 PM 3/16/2002]
would advancing it be a smaller number ( like 4 degrees BTC? )
and retarding it would be larger ( like 8 degrees BTC? )
Kevin
[Modified by ksems, 3:15 PM 3/16/2002]
Racer
Joined: Nov 2001
Posts: 251
Likes: 0
From: Lake Hughes CA
Re: 81 First time timing - a little help (ksems)
Advancing would be to 8 btdc from your 6. Retarding would be 4 from your 6.
Did you change your computer chip? If not change your T-stat back to a 195. The computer controls both the carb and the EGR.
Did you change your computer chip? If not change your T-stat back to a 195. The computer controls both the carb and the EGR.
Abby Normal
Joined: Dec 2001
Posts: 53,432
Likes: 92
From: Press "2" for English
Re: 81 First time timing - a little help (ksems)
kevin, are you disconnecting the computer plug from the distributor? you will never get an accurate reading if it is not disconnected and the car will run much worse than it did before. if your not sure about what i'm talking about, on all computer controlled ignition systems the computer controls the advance and dwell. you have to disconnect the four pin plug that comes out of the back of the distributor to set timing or else the computer will constantly try to override your timing inputs to acheive proper air/fuel ratio. also, depending on how many miles are on the engine (over 100k) i would advance it to 8* instead of six. this is just to take up a bit of the timing chain slack from the last twenty years and bazillion miles. i've been doing this for years with no adverse affects, don't really know if it helps or not, just something i do. :smash:
Thread Starter
Pro
Joined: Aug 2000
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From: Alpharetta GA
Re: 81 First time timing - a little help (rhoeven)
clutch - yes I disconnected the 4 wires clip from the distributor.
rhoeven - I pulled up underneath on the EGR valve while the car was running
and the engine stalled , so I know the valve is good.
Thanks
Kevin
rhoeven - I pulled up underneath on the EGR valve while the car was running
and the engine stalled , so I know the valve is good.
Thanks
Kevin
