87 RX-7 Problem

Well when i first got my 87 RX-7 N/A the guy that I bought it from told me that when the engine warms up it sometimes start running rough. But I still bought it ($800 yes it was a bet), what it did when it warmed up was like if it wanted to turn off and when put in gear and wanted to take off it would take off really slow because even with the gas pedal all the way down it would still not go like normal but really slow I would just let it sit for acouple seconds and the engine will go back to normal. I did the tune up spark plugs, cables, oil, oil filter, and air filter and I also bought a fuel injector cleaner and it did not do that anymore the car was now perfect. But just yesterday about a month of driving the car daily with no problems it started doing that again but only when it warms up and sometime if turns off or if I turn it off it has a hard time starting until it cools down for about five minutes and then it is good to go again. I checked the oil and it is full, I was wondering if it is because my straight pipe exhaust is ripped by the cat converter or if i need to change the fuel filter. Well I really have no idea why it does this someone please help me why does it do this?

could b a leaky injector, or a manifold leak......its hard to start a hot rx after gas leaks in there....not really sure tho..

I also noticed then when I try to turn it on again alot of smoke comes out the muffler...

What color smoke?

white

What color smoke?
white...

It could be too much unburnt gas going through the engine and collecting and burning in the cat that is causing the white smoke upon start-up.

It could be too much unburnt gas going through the engine and collecting and burning in the cat that is causing the white smoke upon start-up.

So what will be the problem the cat converter or the fuel pump?

yeah hot start problems are common among the S4's

More likely the fuel injectors are leaking. Try this.. Start the car and let it warm up. Then shut it down, and after letting the car cool enough to not burn yourself, pull out some of the spark plugs. You are looking for signs of excess gas or any water.

well here are the updates, I have also noticed that when it stats to do all this it like shakes and then white smoke comes out of the middle of the car by were the cat converter is and at the end of the exhaust pipe the smoke comes out brownish. Today we changed the fuel filter and it stil had the same problem checked the fuel pump and it still did it im gettin a pretty good sparg and their seems to be no water or gas in the spark plug could the problem be the cat converter of too much unburnt gas collecting their because when the car starts to do this it smells like unburnt gas.. or could it be some kind of sensor.....Some one please Help Me Out...

check the cat then

if at all possible take it off and see how it runs

(cover your ears too :P)

alright well if it is the cat that their is too much unburnt gas collecting their why is that how can i fix it...what if i hook up the computer to the car is it possible to get any codes....

alright well if it is the cat that their is too much unburnt gas collecting their why is that how can i fix it...what if i hook up the computer to the car is it possible to get any codes....

Unless it's throwing a check engine light then you won't be able to pull any codes from it. If the cat is stopped up then replace it with a new one. If that still isn't the problem then look at the injectors possibly leaking.

But if the injectors were to be leaking wouldnt the car not stop doing the shaking what so ever because mines does stop for a while...

have you checked it again yet?

checked what... the car well it still does the shaking Im almost in the point of selling it...

the cat

well i have been really busy since im still in school but i get out this tuesday and will look at that then

well i have been told that it might be the O2 sensor

thats an easy fix

I pulled a bad o2 sensor code on my 90 fc w/o it setting any check lights on, but its dumping fuel into the engine because my o2 says its running lean.

I get grey/slighty white-ish smoke on initial startup if its cold, or get above 3000rpms it in park while cold., and a strong smell of our expensive high octane gas during start up.
but it will clears when it warms., I'm starting to get a stronger vibration while at stop lights.

but anyways go ahead and change your o2 but I'd still check for any codes just in case its something else.

I know on piston engines constant white smoke means coolant is being burnt, but I'm really still a noob when it come to rotarys.,

hope this gives you some help man gl

Well I already checked for any codes twice and got no codes what so ever so i will just go and replace that O2 sensor....

I pulled a bad o2 sensor code on my 90 fc w/o it setting any check lights on, but its dumping fuel into the engine because my o2 says its running lean.

I get grey/slighty white-ish smoke on initial startup if its cold, or get above 3000rpms it in park while cold., and a strong smell of our expensive high octane gas during start up.
but it will clears when it warms., I'm starting to get a stronger vibration while at stop lights.

but anyways go ahead and change your o2 but I'd still check for any codes just in case its something else.

I know on piston engines constant white smoke means coolant is being burnt, but I'm really still a noob when it come to rotarys.,

hope this gives you some help man gl

Why would you run high octane in an n/a? Waste of money.

yea ...for some reason it runs like shit on low octane..........it really isn't that expensive I just think its funny how I can smell it going to waste. Its like the smell of burning money.

i dont know, i ran 87 in my 87 and 89 in my 91

ran fine.

hell the manual recommends low octane