have a 90 turbo rx7..fuel pressure is good.i dont have any emissions,have a racing beat turbo back exhaust.car doesnt flood when i start it and has no problems starting.its not a coolant smell.

This is how it started. had new engine put in,20b pump and bigger secondaries either 680 or 720,never happened for the first 2000 km on the engine then after 2000km slowly it got worse.could wrong impedence injectors cause it?can a vaccum line cause it?charocal canister?removal of airpump?I looked in haynes it said timing could also cause it.I mean i get huge puffs,enough raw fuel to make a thick white cloud and its washing the oil outta the cylinders..I'll check the resistance of the injectors as well and timing,just thought id get some input from you guys.I even turned my afc all the way down on the idle rpms,made no diffrence car was just stuttering as it usually would when it doesnt get enough fuel.

Thanks

 

i have the same problem...

 

how did it start happening?happen after any mods or anything like that? what mods you got right now?

 

this is at idle?

 

Ya this is at idle.any ideas?

 

does it idle fine? I doubt it's fuel if it does...

if it's cold water dripping out is normal.

 

yup idles fine solid at 750rpm.i was just on your site on how to check codes and im looking at the mazda rx7 factory service manual..any other ideas? And btw thanks for the replies..

 

can a engine seal cause this?if so which one?

thanks

 

after trying to get the idle down(from 1100-1400k) i was adjusting the throttle cable... well, it worked. i got it back down to 750... but the timing was off... it started puffing and the idle was jumping.... now it is back up to 1100-1400rpm and now i smell unburned gas out of my exhaust.

 

White exhaust smoke is coolant or oil, not fuel. Excessively rich mixtures produce dark grey or black smoke.

And we don't have cylinders...

 

oh sorry..the odour doesnt smeill like coolant,no bubbles in the coolant.i meant the oil gets washed off the rotor housings with hte excessive fuel.

 

Just teasing...

 

j

 

well.. its a year later now and i got my license back and i started diagnosing this problem. I got bigger injectors put in from rx7 specialties in calgary back then. What i found out 750cc were in the primaries and the 550cc were in the secondaries and thats what caused my white smoke, ontop of that i ripped apart engine and just full of carbon, all the seals and everything else is like new with only 20,000km on the engine. Just to let ppl know rotaries running rich can cause white greyish smoke, it burns eyes.