I have a 81 12A and it has been giving some problems lately. It will make a whine sort of like a deep whistle and the RPMS will drop drastically. Usually so low the "idiot" lights will come on like it has choked down. I can tap the gas about 3 - 4 times and it will idle normal with no sounds, tap the gas a few more times and it will start dropping in RPMs again. It will keep doing this. I thought it was an air leak causing the problems (thats what it sounded like), but I cant find any leaks anywhere.



Anybody have any idea what could be causing this? This may be a normal problem for you guys, im just not real familiar with rotarys. Alot of people tell me to junk it, or put a V8 in it. I like it too much to even think of junking it, and I dont want to stick a V8 in it. I plan on repainting it, but would like to get this problem fixed first.



Any advice will be appreciated.

 

maybe a vacum leak get a spray botter put some dish soap and water spray on the carb and the little hoses and see if you get any air or bubbles[quote name='rotaryredneck' date='Aug 26 2005, 02:03 AM']I have a 81 12A and it has been giving some problems lately. It will make a whine sort of like a deep whistle and the RPMS will drop drastically. Usually so low the "idiot" lights will come on like it has choked down. I can tap the gas about 3 - 4 times and it will idle normal with no sounds, tap the gas a few more times and it will start dropping in RPMs again. It will keep doing this. I thought it was an air leak causing the problems (thats what it sounded like), but I cant find any leaks anywhere.



Anybody have any idea what could be causing this? This may be a normal problem for you guys, im just not real familiar with rotarys. Alot of people tell me to junk it, or put a V8 in it. I like it too much to even think of junking it, and I dont want to stick a V8 in it. I plan on repainting it, but would like to get this problem fixed first.



Any advice will be appreciated.


[/quote]

 

sorry but vacuum is just that, vacuum, and you wouldn't see any bubbles. the air leaks in not out, so try using some carb cleaner and spray around the intake and carb, any rpm fluctuations should get you in the ballpark area of your problem. hope that helps!

 

[quote name='rexguy' date='Aug 27 2005, 02:43 PM']sorry but vacuum is just that, vacuum, and you wouldn't see any bubbles. the air leaks in not out, so try using some carb cleaner and spray around the intake and carb, any rpm fluctuations should get you in the ballpark area of your problem. hope that helps!


[/quote]



I tried spraying some starting fluid around the hoses a few weeks back and didnt notice a "jump" in RPMs. Over on rx7club.com somebody told me it is probally my shutter valve gone bad.

 

shutter valve is always an option as well. If you live in a n area without emissons testing you could do a rats nest removal and get rid of the shutter valve which would solve your problem and keep you from having to spend a lot of money on a part that can cost some decent $. here is a "how to" on mazdatrix if you have and ?'s.



http://mazdatrix.com/faq/shutter.htm