Hi- My '87 Turbo is all original except for the Racing Beat stainless cat-back - After winter storage was running good, except that the idle would not settle down and it throbbed between 1400-1600 rpm with my foot off the gas. After several tanks of gas run through it on the 900 mile drive from VT to its new home at my house in NC, the problem went away.....for a few weeks. Then it came back. Wondering if anyone has experienced this problem, and if so, how was it resolved, or if no forum member has had this exact problem - any gurus out there who would be able to suggest some possible causes? The idle now will not settle down to spec, and although the car runs excellent for a 30 year old car, I have a faint feeling at a certain RPM while getting on it that there might be a sticky injector - just a seat of the pants feeling when I get on it, there is a point where it seems to pause for a second - not related to turbo spooling as I'm not on it that hard when I feel a small hesitation before all is well again, but that's happening around 2500 or so RPM. Thanks! Throbbing idle or not, for a 30 year old car my dad bought new, she runs good still right up to speeds I won't post about here.

 

Welcome to the board.

My only two ideas on the idle issue for now (based on your description) are (1) a vaccum leak, and (2) maybe a sticky or dying BAC. I've never done one on an Rx-7, but I have had the occasion to clean and adjust a few on Hondas. I imagine the Mazda design can't be too dissimilar.

 

Could it be the accelerated warm up? or separate issue?

https://www.rx7club.com/2nd-generati...warmup-646452/