1st Generation Specific (1979-1985) 1979-1985 Discussion including performance modifications and technical support sections

12A smokes from tailpipe while in idle .

Thread Tools
 
Search this Thread
 
Old 08-11-21, 05:08 PM
  #1  
Senior Newbie Member
Thread Starter
 
Frogman's Avatar
 
Join Date: Jun 2017
Location: Downey California
Posts: 1,048
Received 89 Likes on 77 Posts
12A smokes from tailpipe while in idle .

I susp[ect it's because I fucked around with the big carburetor screw .. and no one can give me a clear answer as to what it does. But all I know is my tailpipe smokes under 3k.

Car has less than 5,000 miles on the rebuilt engine ( 105k total miles)
And about 1000 miles on the rebuilt carb.
Any ideas?
Old 08-12-21, 07:33 PM
  #2  
Rotary Enthusiast

 
Ckforker's Avatar
 
Join Date: Mar 2014
Location: Cape Charles, VA
Posts: 774
Received 109 Likes on 89 Posts
Is it black smoke? Maybe you're running too rich.

Does it run normally above idle?
Old 08-16-21, 11:55 AM
  #3  
Senior Newbie Member
Thread Starter
 
Frogman's Avatar
 
Join Date: Jun 2017
Location: Downey California
Posts: 1,048
Received 89 Likes on 77 Posts
Originally Posted by Ckforker
Is it black smoke? Maybe you're running too rich.

Does it run normally above idle?
No it runs great , the issue only manifest itself after a long trip if i let the car idle it releases a very thin cloud of smog . The engine has 3500 miles on it and started doing this about a week before the original post . When I drive amd wait at the light , i can see small puffs of smoke pass by . I susspect the lucas premix bottle i got was bad .
Edit . I feel I am running rich . I tuned my idle to be in spec and turned the Idle mix screw a tiny bit and that eliminated ALL smoke on start up . I shall turn the Idle mix in a bit and then re adjust the idle to be in spec. If I was burning oil the issue would be worse when cold or when going above 3500 RPM BUT it cleans it up. So I suspect that idle mix is rich and combined with premix = smoke.

Last edited by Frogman; 08-16-21 at 12:16 PM.
Old 08-16-21, 02:47 PM
  #4  
Rotary Enthusiast

 
Ckforker's Avatar
 
Join Date: Mar 2014
Location: Cape Charles, VA
Posts: 774
Received 109 Likes on 89 Posts
Sounds like you solved it. Is timing set to spec?
Old 08-16-21, 03:32 PM
  #5  
Senior Newbie Member
Thread Starter
 
Frogman's Avatar
 
Join Date: Jun 2017
Location: Downey California
Posts: 1,048
Received 89 Likes on 77 Posts
Originally Posted by Ckforker
Sounds like you solved it. Is timing set to spec?
I solved the smoke on Start up . Today I will do what i wrote once I get home. Revs are 100% to spec. 750-850 In drive and 1000-1100 in park depends on the temp . I will have to adjust the Mix screw to be more lean.
As for timing order . No idea i have a 80's electronic start system , the car starts and runs great except when i don't warm it up .
Old 08-16-21, 08:32 PM
  #6  
Senior Newbie Member
Thread Starter
 
Frogman's Avatar
 
Join Date: Jun 2017
Location: Downey California
Posts: 1,048
Received 89 Likes on 77 Posts
Originally Posted by Frogman
I solved the smoke on Start up . Today I will do what i wrote once I get home. Revs are 100% to spec. 750-850 In drive and 1000-1100 in park depends on the temp . I will have to adjust the Mix screw to be more lean.
As for timing order . No idea i have a 80's electronic start system , the car starts and runs great except when i don't warm it up .
Edit
Adjusted the Carb . Car runs better now ! BUT the car still smokes at idle . It cleans up if i redline the car for about 2 mins then it goes back to smoke. If my oil control rings were blown I feel going up in RPMS would raise the oil preasure and cause more smoke eother during high RPM or right after . Instead it cleans it up . Any ideas ? I'm running light premix . maybe if i add more it will help.
I can find out if its my OCR's by using oil stabalizer , that should clear all smoke out but i still think its a carburation issue
Old 08-17-21, 12:12 AM
  #7  
Senior Newbie Member
Thread Starter
 
Frogman's Avatar
 
Join Date: Jun 2017
Location: Downey California
Posts: 1,048
Received 89 Likes on 77 Posts
Ok so I toyed around with the carb, I ended up making the issue WORSE, somehow made more white smoke comes out, IT IS NOT Coolant. If it were coolant adjusting the carb wouldn't make it seep in faster or slower. I really need some ones help , the guy who rebuilt my carb won't reply to me ( he is a good guy, just always busy) .

My issue is the car starts fine with little to no smoke and warms up with no smoke, once the engine is warm, the smoke progressively gets worse and worse and if I rev it I get a good gust of smoke before it clears up, as long as i above 2500 RPM for more than 5 seconds the smoke goes away.

Is there any way the auto trans ATF is being sucked up by the engine? I'm not low on coolant and my oil level actually went up a tiny bit and smells a BIT like gas

Last edited by Frogman; 08-17-21 at 12:47 AM.
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
Sauxons
New Member RX-7 Technical
7
10-20-08 04:02 PM
CrypticApathy
1st Generation Specific (1979-1985)
42
06-17-07 08:13 PM
cheapie
1st Generation Specific (1979-1985)
23
11-20-03 08:22 PM



Quick Reply: 12A smokes from tailpipe while in idle .



All times are GMT -5. The time now is 08:29 AM.