alright on the stock 12a intake hat theres a hole right next to the idle control, right now my car idles like 450-500 and it runs like crap but when i put my finger over the hole it runs amazing it idles perfect at 750 and doesnt shake at all, well i have no idea what this line does i dont know where it goes either. would it be safe to block the hole? i mean is there a bigger problem some where...if i have to i can take a video of it.

 

Download the carb manual from the following link and find it. Only thing I've found that affects idle like that is a 3/8" hose that plugs into the bottom of the air cleaner.


http://www.wankel.net/~krwright/cars/rx7/manuals.html

 

its really werid i pluged it and the car runs so much better way more power.

 

Sounds like the line for the idle compensator. Normally opened by a bimetal thermostat in the air cleaner after the car's up to heat.

If it's open early, it's basically a vacuum leak.

 

well see thats not where the problem is, its the hole with a hose right beside it.

 

 

The dreaded shutter valve. Here's some info.

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

 

Yup. I call that the "Shudder" valve. When it's bad, it sure makes the engine shudder at low RPM.....

 

well what happens if you block that hose off....i mean not that i have or any thing

 

That's what many people do. The car should run fine. You might get a little back firing during deceleration.

 

i did notice i was backfiring when i drove it..doesnt bug me..well it kinda does seeing as my exhaust leaks like a mug lol

 

An exhaust leak will make the backfiring much worse.

 

Pictures, so much easier...

The backfiring might be part of the reason for the exhaust leaks, too. They do have some force behind them.