rotary_problems

Hello!
This thread will go through how i deflood my 1985 rx7 GS (which happens often)
This almost always works for me, and i cant seem to find good unflooding proceedures for 12a.

Step One:
The first thing you want to do is try to remove as much fuel from the engine as possible, but keep it lubricated.




Fuel Pump Wire

You want to disconnect the power to the fuel pump. My car was stripped when i bought it so you might have to dig some interior up, but its behind the drivers seat and about 3" from the driveline tunnel.






Fuel Cut Relay

Next, disconnect the fuel cut relay. Its under the dash on the right side of the steering column. Careful not to pull the whole relay from its brass(?) case.

You may also want to tighten your idle mixture screw all the way to seat (do not torque it tight)




2 stroke oil



Putting 1/4 oz 2 stroke oil in the primaries.


Next, take 1/4oz of 2 stroke oil (make sure it is WTC-3 rated, some oils are not) and put them in the primaries of the carburetor.
Do NOT use ATF!! It is bad for the main o-ring and oil control rings since they are rubber. If you are concerned about carbon build up, use seafoam or marine fogging oil while the engine is warmed up & running.
This step is purely for lubrication of the engine because we will be cranking it over with no oil pressure for a while.




Plug leads - labeled




Set them aside-

PLEASE LABEL your plug wires, disconnect them, and set them aside so they dont get caught in any belts.
If you forget to label them, the distributor has T1, T2, L1, L2 on the top to be fool-proof. But, just label them anyways

All you need to do now is pump the accelorator (once is enough) to let the oil into the combustion chamber, then crank the engine for 15-30 seconds at a time until the engine starts making noise. Leave the choke **** all the way in and dont touch the throttle while cranking. Then, repeat the process (starting from putting oil in the carb until here) one or two more times depending on how long the engine has been sitting while flooded.

Step Two:
Reconnect all electrical components: fuel cut relay, fuel pump, and plug leads.
Pump the accelerator pedal to the floor 3-5 times and start cranking. If you here it sputter or fire, floor the accelerator and hold it.
From this point on, warm the car up with the choke like you normally would, and you're done!!
(ENGINE WILL SMOKE)

If it doesnt start, add oil to the carb again. This time, the oil will provide better compression on all surfaces. Make sure the volt meter reads 12v while cranking




Battery charger

Mine was cranking at 10v so i decided to charge it. Repeat Step Two until it starts. The first time i unflooded it probably took 6 times!!
If you try more than 5/6 times refer to the complex unflood procedure for 13b engines

Hope this helps!!!
Happy Brapping!

RotaryEvolution

iTrader: (30)

seems like a lot of work compared to removing the lead plugs, coil power wires and cranking the engine til it stops misting fuel.

Jeff20B

iTrader: (13)

That is a whole lot more work than knowing what caused the problem and fixing it. But education ain't cheap.

Oh and nice user name, rotary problems. lol

lduley

iTrader: (1)

Just putting the 2 stroke oil in the primaries and flooring (not pumping) the pedal would help unflood a carb'd engine

rotary_problems

This is true, but it takes less time believe it or not. This is aimed at an audience that may not have the tools or confidence to pull their plugs out. Furthermore, pulling the plugs and cranking is sometimes dangerous if your plug leads get gas in/on them or if there was an electrical short. So its just my preference to leave them in unless its totally necessary

rotary_problems

Thanks! Haha

It is a lot of work, but its not always obvious what the problem is, and if you need to depend on the car to get you somewhere asap this method requires 0 tools

rotary_problems

This is true! But, if you floor the accelerator and crank, lots of fuel will be carbureted into the motor, and could soak your plugs!

Ashley Drummond

That seems like a really easy process. Glad I came across this post. Just on a side note as well, would it make the process a lot easier if the fuel pump fuse was taken out rather then disconnecting the actual pump and the fuel cut relay?
many thanks