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

85 12A can't get engine to idle

Thread Tools
 
Search this Thread
 
Old 07-09-23, 04:32 PM
  #1  
Junior Member
Thread Starter
 
Cary Yamamoto's Avatar
 
Join Date: Aug 2020
Location: Reno
Posts: 17
Received 0 Likes on 0 Posts
85 12A can't get engine to idle

I have an '85 12A with the Nikki carb. Couldnt get it running, and realized it may be flooded. I pulled the plugs and cleaned them up and cranked a few times to clear out excess fuel. Once I did this, the car started fine and I was able to pull the choke cable to high idle. Once it warmed up, the choke solenoid pulled off the choke normally, but the engine wont idle. I have to pump the accelerator twice and it will start one warmed up. I can feather the throttle above 1000 rpm to keep the engine running but it stumbles and misses. Any thoughts on whats happening? Should i change plugs and wires? Is the carb sticking?
Old 07-09-23, 10:43 PM
  #2  
Moderator

iTrader: (3)
 
diabolical1's Avatar
 
Join Date: Feb 2002
Location: FL
Posts: 10,819
Received 306 Likes on 267 Posts
was the car idling and driving fine before the flooding incident?

did you make any adjustments to the carb while trying to get it right?
Old 07-10-23, 10:23 AM
  #3  
Junior Member
Thread Starter
 
Cary Yamamoto's Avatar
 
Join Date: Aug 2020
Location: Reno
Posts: 17
Received 0 Likes on 0 Posts
I didnt make any adjustments yet. I couldnt get the engine to idle less that 1000 to make any adjustments. The engine is very difficult to feather the throttle to keep running at 1000. It was running "ok" before this incident, not great, but it was idling fine. But this was about 6 months ago. I drained the tank and put in fresh gas and check inlet hose at the carb to make sure gas supply was ok. I could see the float window on the front and its about 1/2 or below, so the float looks ok. When the engine is at high idle, I can see the gas flowing at the venturis.
Old 07-11-23, 01:11 AM
  #4  
Moderator

iTrader: (3)
 
diabolical1's Avatar
 
Join Date: Feb 2002
Location: FL
Posts: 10,819
Received 306 Likes on 267 Posts
did you put a new filter after you drained the tank? if not, try that and see if it helps.

maybe see if turning the idle speed screw makes a difference. don't touch the mixture yet. just see if the speed screw affects it.
The following users liked this post:
Cary Yamamoto (07-11-23)
Old 07-11-23, 10:39 AM
  #5  
Senior Member
 
raven12aFB's Avatar
 
Join Date: Jan 2018
Location: Allen, Texas
Posts: 601
Received 115 Likes on 100 Posts
Check for a vacuum leak......
The following users liked this post:
Cary Yamamoto (07-11-23)
Old 07-11-23, 11:54 PM
  #6  
Junior Member
Thread Starter
 
Cary Yamamoto's Avatar
 
Join Date: Aug 2020
Location: Reno
Posts: 17
Received 0 Likes on 0 Posts
Originally Posted by raven12aFB
Check for a vacuum leak......
This looks like a vacuum leak demon dream. Are there any obvious spots I can check for vacuum leaks?
Old 07-12-23, 04:58 AM
  #7  
Senior Member
 
raven12aFB's Avatar
 
Join Date: Jan 2018
Location: Allen, Texas
Posts: 601
Received 115 Likes on 100 Posts
Originally Posted by Cary Yamamoto
This looks like a vacuum leak demon dream. Are there any obvious spots I can check for vacuum leaks?
Get some starting fluid and start spraying around the carb...... Spray the little hoses...... Probably you'll get lucky and find a leak ....

Good luck.....
The following users liked this post:
Cary Yamamoto (07-14-23)
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
ThirdPedalNirvana
1st Generation Specific (1979-1985)
6
03-06-18 10:18 PM
Sauxons
New Member RX-7 Technical
7
10-20-08 04:02 PM
Siraniko
1st Generation Specific (1979-1985)
13
10-08-06 09:55 PM
EonBlue
1st Generation Specific (1979-1985)
10
06-25-05 07:56 AM
moondog49
1st Generation Specific (1979-1985)
5
08-26-04 11:38 PM



Quick Reply: 85 12A can't get engine to idle



All times are GMT -5. The time now is 03:08 PM.