Hello,
Would greatly appreciate any help regarding my 1981 rx-7 GS idling issue.
Have owned the car since new. Just under 83,000 km.
All original. Always garage kept.
Very stressed regarding an idling issue that just started within last year. For 43 years my rx-7 always maintained a steady 750 rpm while idling.
Sadly, it now drops suddenly and often the engine stalls. Can be dangerous while driving re potential for rear end collisions.
Replaced original spark plugs earlier today. No difference re idling issue.
Likely carburettor??
Thanks for any suggestions. I certainly want to keep my immaculate and treasured rx-7 for many more years.
Also, terribly frustrating trying to find v rated top quality 13 inch tires!!
Find it hard to believe tire companies do not offer such as there are many collector cars out there that are from the era of 13 inch tires.
Thanks you!!

All original. 1981GS.

 

Something to consider after ensuring that the fuel and ignition systems are functioning properly would be some very slight adjustments to the carburetor's air fuel mixture screw. On my 80, I have had to make very slight adjustments, as the engine would run a little rough at idle and would want to stall. I would however, go through and ensure you have good or new ignition components, such as a cap, rotor, and wires. You want to ensure the new plugs are able to produce spark efficiently. How old is your fuel filter? I would consider looking at that as well. Be sure to check for any vacuum leaks or dry and brittle vacuum lines and hoses.

 

Given the age and condition of your car ( I see you posted 3 times about the idle in the past ) I would think it could be almost anything due to the age of the components and the fact that you still had original plugs and just changed them. So start from the top and replace the ignition components (cap/rotor/wires). Make sure the timing is set correctly too. Also you may want to refresh all the vacuum lines, one at a time. I would not, based on your previous posts, dive into messing with the carb settings first. The idle is a symptom of something that recently changed due to wear and tear or sitting or something else. Finding the root cause is the best solution.