zerogrips13

ok i bought a 86 rx7 sport (5lug wheels)

a few questions.
what options and upgrades come with the sport upgrade..

and now the main question. the car starts, but runs shitty and makes lots of blue smoke. i am not fimilar with these engine, but im trying to learn. i wont be able to work on the car for atleast another week so im kinda gathering thoughts and opinions on what i could check and diagnos to find the problem..

heres as an acocunt of starting the car as detailed as i can remember.. key in crank ..takes a lil to get it started... oil pressure jumps to 100 and light comes on then goes to 40 or something since u have to keep on the gas a bit..acts liek major vacum leak..wont really idle just wants to die..and the hole time blue smoke is commin form the rear of it...

anyt thoughts... oil seals maybe......thanks in advance

Tournapart

iTrader: (4)

yeah, sounds like your oil seals took a ****. not a big deal, as long as you REALLY planned on working on this car. Theres alot of information to be harnessed on this forum. The way it sounds is that you have a rebuild in your immediate future, but dont worry, as long as you have some mechanical skills, these motors are easily rebuilt compared to a piston engine. Just remember, in this forum people will burn you alive if you ask questions and you didnt search first. good luck and welcome to the club

Ruffryder_29

Try to search FAQ. they may have the answers you are looking for. There are alot of good write ups in there as well. Most problems with your car have been worked on by others and they write them up to share with us. Happy hunting!!!

Aaron Cake

iTrader: (1)

This question is not covered in the FAQ. It helps no one to direct them to the FAQ if it will not have the answers they need.

There could be many causes to this problem. A vacuum leak as you suggest, very clogged injectors (or one stuck partially open), poor spark plugs/wires, etc. But is does sound like the engine is burning oil. Generally it's not going to run poorly if the oil problem is worn oil o-rings, so a compression test is in order. Smoke and poor running usually means lost compression (ie. blown seal).

zerogrips13

now i read something about taking out the shrader valve to check compression.. on my tester there is a button i press to relief the pressure after testing, is this the thing i have to remove, and how come.. and i read that 80-90 psi means a rebuild is comming in the near future, so what is good compression?

Aaron Cake

iTrader: (1)

Now you need to start searching. 80 is definitly low. Just hold the pressure relief button while someone cranks the car. Same as removing the Schrader valve.

Curtisleeyoung

Blue smoke sounds like oil, a compression test might reveal a little more of what is going on inside your engine. check this article.


Compression testing

zerogrips13

thanks alot.. cleared everyhting up..well im hoping to get the car to place were i can work on it sometime next week.. so we will see how it goes.. also if u think there would be any point in trying to save this motor with the atf trick? if its oil seals im pretty much screwed arent i? the car sat all summer without relaly running, u think the burning of oil will stop if i let it run for a while??

newbieRX-7

blue smoke that means the coolant sensor/water tempurture sensor and ur throttle is fucked get a engine diagnostic and that will tell you that is the problem i jsut got my rx-7 fixed and that was the promblem

idsigloo

blue smoke comes from oil burning so what does the coolant sensor have to do with that?

zerogrips13

i will pull codes soon as i can

zerogrips13

ok came up with some more question while doing my research...

if i were to use a rb road race design header that called for the elimination of the acv would that really cause a problem...i plan on making a hybrid vdi intake and having both the 5 & 6 ports and vdi run off the air pump.. would eliminating the acv cause a problem with this?

Aaron Cake

iTrader: (1)

Nope. ACV has nothing to do with smoking.

Messed up air/water temp sensors generally don't cause smoke. They MIGHT cause black smoke under the right circumstances, but will usually just cause lack of power, poor mileage and failed emissions.

zerogrips13

with the acv removed will i have problems with running the vdi and 5/6 ports off the air pump thanks.. also why does the road race header require u remove the acv?? (wouldnt any header make u need to remove it?>?... )

Aaron Cake

iTrader: (1)

Aren't you the one in the other thread trying to tell me that removing the emissions stuff is a power mod? Since you know so much, figure it out.

Seriously, removing the ACV has nothing to do with the 5th/6th ports or the VDI. I just checked my Haynes manual (hint, hint) and verified that the solenoids for both those actuators connect to the air pump before the ACV.

Checking the Haynes manual again, it can be see that the ACV's purpose is to supply air to either the exhaust manifold (via the little passages in the ports), the cat or dump it to the atmosphere. What it does depends on the conditions the engine is currently seeing. Since you would be removing the cats for the header and replacing the stock manifold, you don't need any of these functions. Thus, the ACV becomes unnecessary and you install a blockoff plate.

zerogrips13

thats what i wanted to know... i just bought the car and ive been reading up alot.. but some stuff is vague and i havent got my hanes manual yet...and im on dial up so downloading trhe fsm takes too long..but i appreciate ur help.


also i wasnt saying u were wrong in the emission thread, but i was saying i see keeping the air intake path cleaner (egr removal) as a performance mod.. anyhting to make the engine better...but there is no way to get 10 or 15hp out of removing emisiion besides cats.

Icemark

Actually on the stock S5 non turbo, the connection/pipe for the solenoids is on the body of the ACV, so if you removed the ACV and didn't make some sort of an adapter for the lines, the aux ports and VDI would not function.

Both the FSM and Haynes are remarkably unclear on that.

So in this case he would have to build some sort of air flow adapter anyway, as the above feed does not apply to S4 models anyway.

zerogrips13

its an s4 that ima convert to vdi, and run 5/6 ports and vdi off air pump.. will this work?

Aaron Cake

iTrader: (1)

I had assumed that it would be obvious when this person went to work on the car. Maybe I should have pointed it out.

This is stuff you have to mention first...

In your case, you would simply use an RPM activated switch to control the ports/VDI. Writeups in archives.

zerogrips13

well ya know in the first post i did say i have an 86 sport... but i guess there couild of been s5 in 86... oh wait i think i am mistaken :P...

it sok everyone makes mistakes, but this time i beleive it was not me ..
alot of usefull information none the less and i appreciate it