I got my 84 running and quieted down (pulled off cat back and installed a turbo muffler in it's place). Now it doesn't want to stay running. As long as the choke is engaged, it will run in neutral, but as soon as I try to put it in gear, it wants to stall out. Also, as soon as the choke kicks out, I have to stay on the gas to keep it running. Any ideas?



Jake

could be a vacuum leak, how does it run if you do get it going?

It seems to run fine as long as the rpm's stay up. I haven't taken it out of the yard, (afraid it will stall and get me stuck) so it hasn't even gotten out of 1st gear. What should idle be on these motors? It's real choppy under about 1500. I think all the vacuum lines are hooked up, but I'll recheck them all.



Thanks

Jake

idle is supposed to be at 750rpm but all mine are set at about a grand or so.

:( ...and I thought I was the only one with this problem.

I have had the same problem. I bought my 85 RX7 from a junk yard (U-Pull-it) and it had it's cat. pulled off and it could only run correctly with a zip-tie holding the choke down. I still haven't found the problem. My only advice is to put the cat. back on. It's easer than playing with it untill it works. I think it is a backpressure issue. -Devon

I Tcould be that you have a egr valve in your vacum system blown i have had these problem in the past pull the vaccum hose off the bottom of the air cleaner an stick a bolt or something in it an see if it smothes out



I'm currently running with no cat as long as you have a presilencer the back pressure is fine Rotary Performance in Garland Texas makes a great pipe with presilencer on it for $75 an you get the add performance of not having a cat without the noise I run this with a stock muffler an it's a nice low growl sounds real good an not so loud yuo can't hear your passengers or the radio..



Good luck

the cat has no bearing on the operation of the carb and choke. removing it only spews hydrocarbons in the air.



there is a fresh air supply for the cat coming out of the intake manifold. if you do not block this up (everyone sells a blockoff plate) you will have a vacuum leak. Resulting in the problems you describe.

that is not the EGR valve, it is the shutter valve. it leans out the mixture on decelleration to prevent backfiring.



the Rotary engine need little to no backpressure. If you have a set of commercial headers or a stock manifold, you have enough backpressure.



the presilecer is a GREAT idea as it keeps the lawnmower on crack sound to a minimum. Although the stock muffler leaves a lot to be desired in terms of flow.



Nothing beats a complete exhaust from RB or Mindtrain. Quaility, power, far from loud, and will last you forever.

quote by yayarx7@Posted on May 26 2002, 05:22 PM "there is a fresh air supply for the cat coming out of the intake manifold. if you do not block this up (everyone sells a blockoff plate) you will have a vacuum leak. Resulting in the problems you describe."



I had purchased my Rex from a fella who told me that the cat had been replaced. (The one I purchased it from didn't have it long and didn't drive it.) If the line running from the cat to the intake manifold was disconnected OR there was no blockoff plate this, am I to assume this is the cause of my problem?