White smoke out the exaust at hi revs?
 

I got a 12a i just removed the catilic converter cuz it was stoppin power at hi end ,i replaced it with pipe and noww at hii revs i get alot of whtie smoke out of my exaustt is this good or bad?

Usually white smoke means coolant seals are beginning to go bad. Fill up your radiator overfill tank and run around for about a week. If there is barely anything left in, I would check out the O rings around the intake manifold to begin with. If you check them out, replace them. Even if they look good, they are 9 times out of 10 too old to put back in. Any cracks and you might have your culprit.

20mm freeze plugs, or 2 quarters and some sillycone will fix the coolant path into the intake manifold. Stick them in the coolant passages on the housings.

If/when you replace them and it still sucks coolant more than a trailer park hooker, I would start to lean towards your coolant seals going out. Let us know your mileage.

Also, in a semi-unrelated topic, does your passenger carpet feel moist at all?

Does it only blow smoke when you let off at high rpms? That would imply bad oil control rings, in which case Lucas Heavy Duty Oil Stabilizer will become your new best friend.

Otherwise, you are probably looking at coolant seals. If that is the case, check the seals in the intake manifold as Jeezus advised above. If that doesn't fix it, then it is the internal coolant seals that are causing you issues. Those can only be replaced by rebuilding the motor. However, there is another option that has worked very well for me, you can find it in the Archive section. :)

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Am having similar problem. I had eliminated the rats nest only to simplify things a little more, and accidently eliminated a bad vaccum leak that it already had. Ran perfect one day, after that it wouldnt idle good it really wouldnt want to hold idle I had the hood opened when trying to keep it going to see if I saw any leak, but instead I found a mist of water looked like around the carb. on the driver side and vapor as if it was steaming out of there, I know its radiator fluid due to the smell of the vapor and the exhaust white smoke. Anyone has any suggestions on what mine might be doing? I've owned the car for 6 yrs and havent put 50 miles on it LOL, Help!!! Thanks.

Here's the thread on using Alumaseal to repair internal coolant seal leaks: https://www.rx7club.com/1st-gen-archive-71/engine-coolant-seal-repair-maybe-750774/

But keep in mind, this should only be done AFTER you've confirmed that the problem is not the O-rings between the intake manifold and the motor.

Good luck :)


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Thanks, I couldnt find freeze plugs so I went with the two quarters and so far it seems to have fired up fine and ran good smoking very little but now I have air beeing sucked thru that plate between the Carb. and the Intake you know that black one, lol dont know what its called. Will pull carb up again and see if I could fix this with silicone unless if theres something else I could use. Will keep report on this tomorrow, Thanks. :icon_tup:

Is there a reason or would you guys know how to fix if its a problem grey - black smoke now, am like wtf all vacum leaks have been fixed thanks guys. Can anyone help me with this other situation? :scratch:

Does it smell like gas? oil? Maybe you're missing something inside the carb...

well, it dont smell like gas or anything like that I was smelling some radiator fliud being burnt but I guess it was from taking the intake out and spilling over the exhaust, its gone now but it sure smells like carbon dioxide at rear. Have any idea what could it be? I was told by a guy at autozone to check my engine ground wire, is there any ground wire like to block? he mentioned something like that but I dont see anything from top view and never seen it. My 13b turbo has it but not my 12a. does anyone have a pic with ground wire on a 12a with rats nest eliminated I could take a look at???

The negative battery cable should run from the battery to the engine block, with a stop at the strut tower along the way. Stupid simple, so you must be over thinking the matter. :)

But can you explain to me what the engine ground would have to do with smoke out of the exhaust?

Dump a can of seafoam into the gas tank, and take it for a drive. Check the fluids when you get back, and find out what you're suddenly low on. Then, fix that issue. Playing guessing games with the guy at the parts counter isn't going to get you anywhere...

Good luck.

well, I dont think its got nothing to do with the smoke at all, The guy behind the counter "used to have an rx7" and he told me that for a long time he had problems at idle it would be rough so he did a ground on it and ran smooth, I yet to do this having really bad weather but when it clears I will give it a try. And to the seafoam, Would it smoke bad when driving since it will be dumped into the gas tank??? you know bad enough to get pulled over??? I unlocked an 81 rx that according to the previous owner the motor was bad LOL and after some research found out that seafoam would release the stuck apex seals and 8 yrs later my dad still drives it on a daily basis as long is not raining though. Thanks.

133,000 miles

Seafoam in the gas tank won't smoke like when goofballs put it in through a vacuum line or dump it down the carb...

I too have white smoke coming out of the exhaust but I'm running a 13B. Is the solution pretty much the same or is there a different fix for the 13B?

My motor was pumping out a cloud of smoke that made it look just like a house fire. I had just installed it, it was used but new to me, and that is what I got when I started it up for the first time. I was pissed! So I tried a short cut, and it worked great for me. Here's the thread on it:

https://www.rx7club.com/showthread.php?t=750774

the engine has 121 *** miles on it. i just changed the oil today to 20 50 and the smoke has gotten alot worst i really cant take this no more now is just to much smoke it dosent throw it at all times it just throws it at then end when i stop reving it hard it will throw a large cloud but im wondering is it just cause i removed the catalic converter or can it be the things above?

Oil control rings are shot. Check the oil level, make sure you didn't overfill it.

Drain out 1 or 2 quarts of oil, and replace it with Lucas heavy duty oil stabilizer. If that doesn't take care of enough of the problem to let you drive the car, then you'll need a replacement motor or a rebuild...

ill do this tomm when i start the car, does this means everytime i go do a oil change ill have to add this Lucas heavy duty oil stabilizer if so how much ? what do you recommend taking out 1 quart or 2 ? btw the funny part is that i thought it was seal gone bad but the car still has alot of power to it type weird hope i dont need a rebuild =l

My oil control rings were shot for about 2 years. I drove it just fine for those two years, as well as some autocrossing. Lots of smoke if I revved it high and let off, but otherwise was fine. I only ever burned enough oil that I needed to add more during races. Regular street driving was fine. The engine finally blew an apex seal at the end of August.

Yes you will need to add some every oil change. The old stuff will be drained out.

Kentetsu... what was the highest amount of Lucas to oil ratio you ran?? Right now I am running 1 qt. of Lucas to 4 qts. of oil..

BTW... I put Lucas in my transmission yesterday..... all I can say is WOW!! Much better shifting!

In my old motor, I ran up to two quarts of Lucas. Worked great...

Did you see an increase in oil pressure when you ran 2 quarts of lucas? I added about that much to my SE and my oil pressure (stock, orig sender/gauge) idles @ 70 psi and goes past the top of the gauge @ 5000 rpm and up. No more oil smoke puffs but the pressure concerns me that I'll blow something out!

There might have been a slight increase, in fact I'm sure there was, but I'm talking like 3 - 5 psi. I think that if you are seeing pressures that high, you have some other issue...

Added 2 quarts off lucas is still smoking.. Should i try the coolant 4 dollar sealer? Which one is the one you used the link is not working.

http://www.youtube.com/watch?v=PpN9dhsg92o

that's a link to a video of a rx7 doing the exact same thing mines is doing is just that mines a 12a.