Keegan

got this for 50$ just the way it is. it sat for 5 years under some trees . he bought it five ago and could not get it started and just parked it .I just had to clean the gas line and it fired right up but i cant get it to idle below 2k whats wrong with it

IanS

iTrader: (4)

May be vac leak or possible choke stuck on. Also could be the carb needs rebuilt - may be sticking. Could be quite a few things really. 12A or 13B?

Keegan

12a not the choke or vac leak if i tri to idle below 2k it sputters for 30 sec than die

IanS

iTrader: (4)

Are you holding the gas pedal down to keep it running or are you adjusting the idle speed screw?

RotaryRevn

did you drain out the old gas and put in some new stuff? that always seems to do the trick. Great deal by the way

Keegan

for awhile holding the gas pedal but then just adjusted idle speed screw . and i did clean the gas tank 2 times

Paradox

iTrader: (1)

engines probably carbon locked. ATF it, change fuel, fuel filter, spark plugs, dist cap, plug wires.... then see how she goes!l

btw nice find for 50 bones!

edit: didnt know you already fired it up, that cant be good for the seals. hopefully it'll be ok tho

Keegan

I just poured gas in the carburetor, and it started. what does ATF mean?

Paradox

iTrader: (1)

ATF = auto transmission fluid, basically when a car sits too long the rotors can become hard and lock from carbon build up. starting a RX which has been sitting too long (or any car for this matter) can cause damage to the internals..

read this

https://www.rx7club.com/showthread.p...TF+carbon+lock

has some good tips for cars that have been sitting around for awhile

IanS

iTrader: (4)

It means listen to everything he said except that....


Actually, Automatic Transmission Fluid apparently cleans out large deposits of carbon. You "can" put it into your engine and let it soak basically. Just make sure to soak each rotor surface. best bet though is to maybe try something a bit "safer" such as seafoam, marve mystery oil (MMO) or another type of cleansing agent designed to be put inside a combustion chamber. Another method is "steaming" which is shooting water down the carb (or letting it get sucked in by a vacuum source) to clean the internals. I personally have heard of many people having good luck with all these but ATF seems a bit harsh to me and I have personally not tried it.

If the engine only runs when fuel is poured into the carb check the fuel pump fuse and fuel pump itself could have gone out. Also clogged filter could be a culprit as mentioned earlier.

Bah. Paradox, you type too fast.

Pen_Two

****.

Paradox

iTrader: (1)

lol, just had to search for that link, it definetaly has useful info on the suject. my SE had sat for 3 years before i got it so i read into that a fair bit

The Spyder

iTrader: (8)

Wow that car looks familiar, where was it?

You should try MMO'ing the motor, just dump in mmo as you crank it over via the front 19mm bolt in the main pully, let it sit, and then try starting it.

trochoid

iTrader: (6)

If the engine runs and has good compression, it is not carbon locked. I wish some people had a clue what carbon locking really is.

Sounds cool doesn't it? 'Hey man, your motor is carbon locked. Pour this magic **** in there and it will run better than new.'

A carbon locked motor does not turn over, it is locked.

Since the car sat for 5 years, pull the carb and rebuild it. When gas evaporates, it turns to a varnish and gums up everything. I would drop the tank also and clean the entire fuel system, just to make sure old gas and rust problems don't come back.

Why would you even expect the car to run well when the previous owner couldn't get it started?

And yes, I did get up on the wrong side of the bed this morning.

Pen_Two

You eased my worries for mine, it sat for like 9 years till I got it. I got it started up though. Then I read what they posted and got me very worried.

rxtasy3

iTrader: (2)

i agree. remove and clean and rebuild the carb. sounds like the idle circuit in the carb is clogged up.

stilettoman

iTrader: (1)

Trochoid is right - rebuild the carb. Even if that is not the main problem, it is cheap and that will be one less thing to worry about later.

I rebuilt a lot of wrecked RX-7s years ago, some of them after sitting for few years. Based on my experiences with these wrecks that sat too long, you may solve all your problems by just putting some miles on the car.

Never had one carbon locked, but I know people who did. My interpretation of that phrase is the apex seals get gummed up and locked into the grooves in the rotors, so you can't get compression. If you can get it running, the centrifugal force will generally break them loose.

The best thing I know to dissolve the carbon is fuel injector cleaner. It is nasty stuff, and may damage the o-rings on the rotor oil seals if you leave it in there very long, but it will generally take the carbon out. If you use something like that, let it sit for a few minutes, then take the car out and drive it.

Pouring water down the carb while the engine is revving will definitely take out the carbon, I have seen it done. But it is risky - you may take out your apex seals also. Better technique for an old tired V8, but not advised for rotaries.

Keegan

thanks lots of help