why does my car smoke when i start it up or rev it up past 6,000 RPMS (sometimes) i know this might be a stupid question but i dont know much about rx-7's. the smoke seems to look blue so im thinking its something with the coolant im not sure : / any help would be appreciated thanks.

 

Well the color of smoke is always helpful.

Blue smoke would be burning oil but on startup a small amount is typically normal and most 7 owners have the issue.

Honestly I am not certain on the over 6,000 rpm smoke as I typically don't rev mine that high just sitting but might not be anything to be concerned about.

Any other smoke while at idle or under load while driving?

Mike

 

My RX will smoke sometimes when it's started. Usually If I crank the car and it won't start (I need to replace that starter!!). It lasts a few seconds and then goes away.. But that smoke always is white. I've never had it smoke upon reving the engine, but like Phantom, I've never sat and rev'd the car that high while it wasn't actually accelerating itself forward..

Blue smoke is definitely the burning of oil..

 

Oil control rings on both counts... Save for a rebuild, run it as long as you can..

 

i have the same problem with my 86 seven. mine seems to burn at 5,000rpms and sometimes at start up. there is a rattal and stuff under the car does urs do that? cuz if u find a way to fix it let me know cuz i dont have a clue what it is.

 

what up,

as for the start up issue i dunno? but the buring of oil (blue tinted smoke) at high rpms is normal. if you read trough a repair manual and look at the intake/fueling area it should tell you that you have oil injectors that kick in when you hit high rpms (the exact rpms changes between turbo/NA and s4,s5 cars) they inject oil on the rotors to keep everything lubercated. i have a late 87 TII, and yes its a bitch but i'm loven it.

PS that guy that said oil control rings is trip'n if the oil control rings were gone it would burn oil like a mo fo all the time and you would have lots of fuel in your oil and there would be a noticible loss of power.

peace.
Gear

 

Gear- NO OFFENSE BUT:

Wow you are a total moron. When the oil control rings start to go they allow blowthrough past the seals at higher pressure times such as at high RPM's. God I really hate people like you that spread miss info.. You are total moron. I hope that one day moderators start banning idiots.

 

R

there for w/ the oil control rings out the car would burn massive amounts of oil! but the discription is that the car burns it slighty and when you shut the car off or start the car up the fuel not burned in the compreation with a bad seal usualy works its way back through the seal into the oil system ther for getting fuel in the oil (pull out dip stick smells of gas) this can happen quickly or take a little while longer. So R they should ban people who think theyre no it alls and will not take what others say in to acount, so stick that in your pipe and smoke it.

peace out,
Gear

PS look at a repair maual for the truth there are oil injectors.

HA

 

my car doesnt use one drop of oil to my knowledge and not one drop of coolant, but i get BIG BIG BIG BIG BIG BIG WHITE POOFY smoke that you cannot see through usually during mornings. idk why. no one helps me when i make threads.
i think its just excessive fuel/premix flooding out the system.
Thanks.

 

Dude, I know there are oil injectors.... I swear you just prove my point... Ugg, I am not going to bother arguing this anymore with you. I have had 5 out of 18 rx-7's I have owned end up with bad oil control rings, so I really don't need for you to preach the effects to me. It sounds like bad oil control rings, the original poster can believe what he wants but in the long run he will need a rebuild. Do you honestly think that mazda built the Rx-7 to SMOKE at high rpm's due to the oil injection system? THat is retarded, no-one would have bought the car if it "always" smoked at high rpm's.

Orig Poster:

Rule of thumb:

Blue Smoke = OIL
Black Smoke= FIRE/carbon
Grey= Fuel
White= Coolant

White smoke mixed with Blue is usually high pressure blowby from coolant seals and oil seals... When driving and above 5krpm.

A little poof at startup is usually seepage sitting in the bottom of the "chamber".. Probably fuel and oil mixed..

Good luck sifting through all the **** info on the forum.

 

DUDE!!??

some porches smoke oil slightly all the time becaue thats how they were built and yes obvesly people bought them.

 

I'm with you on this RRTEC.

Porches, eh? I don't know about you but I don't have any oil on my porch (only wood and some railing...oh and a door) so it doesn't ever smoke.

 

HAHAHA that's the funniest thing I've seen all day..

 

i dunno how to spell it not very good w/ words

 

^not very good with cars, either.

 

so you wana open that can o' worms ok. as for the oil smoking issue max oil psi should be achived at a round 3000+ rpms when the car is aprox. full w/ oil so if the control rings are bad like you say they should smoke then and up till 6k and beyond and if you run stock or racing cats. (cattilitic convertors) you wont be able to see the smoke that the oil injectors create. if the cats are good any who. and under normal conditions the car should use aprox 1 quart of oil every 3000 miles.

 

step off

 

At least use Word to check the spelling of things like "Catalytic Converter".. It adds some more credibility.. It'd also help to capitalize words that start sentances and such. I don't know.. Call me silly since sentance structure seems to be something they hand out to any first grader anymore.. Are you sure you're old enough to drive a 7?

Also your last statement makes absolutely no sense.. Proof reading also is important.. I've never heard of a car which has been DESIGNED to LOSE a quart of oil every 3k miles.. I also can say that this isn't true on the RX-7's being that I've gone 6k miles since my last oil change, and have only lost half a quart and that's because I've got a slight oil leak.

Your smoke theory holds no water..

 

The rx-8's are loosing about a half a quart between oil changes... But none of this proves that what you say is the root to his "CLOUD OF SMOKE" on high rpm's.. That is my point..

YES we all know there is an oil injection system (welcome to the world of rotaries)
YES the rx-7 will burn oil between oil changes

NO the car was not designed to smoke at higher rpms

YES you are a moron.