ArExSeven88

my damn car keeps flooding out and i dont no why...somtimes it starts fine other times it wont start..i let it sit over night and it starts again..i bought a new afm and i put it on and it doesnt work..it just bogs my car down..i dont no why and i dont no what to do..can somone please give me some insite cuz im really gettin dissipointed cuz i dont no what to do..thanks

VacavilleFC

low compression or dirty fuel injectors cause flooding

Rxxx-7_GSL-SE

or blown coolant seals

apexFD

Jesus christ people, give your car tune ups every year.!!!

-Ben

VacavilleFC

thats not correct rxxxx-7gsl-se, he'd be complaining about lots of white smoke coming out his exhaust if that was the case.

flooding is caused by leaky injectors, or low compression.

CyberPitz

Can't get much more better than this explanation!

TurboMazdaSpeed

prob low compression. i have a friend with 240+ THOUSAND kms on his orig. N/A engine and it floods quite often haha, but still runs nicely

CyberPitz

I've got low compression and I don't flood...well, once every couple weeks. I like to think I'm doing quite OK for 60 on both rotors

Turbo II Rotor

iTrader: (2)

not letting the car warm up will also do it.

t-von

iTrader: (8)

Don't give leaky injectors too much credit. Example....Carburators don't automize the fuel that well during start-up cause of a lack of air volume and flow, yet the older rotary's would still start with out problems. You could even pour gas into them allowing the engine to start if you had fuel pump problems. So it's not really the fuel injectors. From my past ownership of 4 differant Rx7's( 2 carbed 12a's 1 Fc and 1 fd), i've come to realize that flooding has more to do with leak compression as the primary source and fouled plugs being 2nd. When the engine floods, the spark plugs get wet and the plug hole begans to fill with carbon gunk that comes off the rotor faces making it hard to spark and ignite the now liguid fuel. Plugs have always been designed to combust fuels in vapor form (which causes the bigger explosion) and not in a liguid state (which causes the weakest explosion) however, engines with healthy compression can use it's compression to help vaporize the liquid fuel. This is why rotary's still start with carbs.


So the bottom line is, if you manage to keep the engine compression very healthy and good plugs, flooding will be a distant memory.

ArExSeven88

i dont understand how it starts up fine every morning like perfectly ..and then as the day goes on thats when i start to have problems..i have a 88 vert non turbo....and my car was starting and running fine untill i took the stock airbox off and put a cone filter on..thats when all the problems started

t-von

iTrader: (8)

Then it's odvious your having hot starting problems and not flooding. Rotary's are more prone to flood when cold, not hot. How does your engine run when it's running? Hows the power/idle. Try to be more detailed in explaining your vehicles symptoms so we don't jump to conclusions with our explanations.

AllMotorRotor

Few options...

For some hot start flooding issues, disconnect the FPR from the electronic solenoid and plumb the FPR vacuum line directly to the intake manifold. During hot starts, the ECU does not allow vacuum to go to the FPR for a certain amount of seconds causing the fuel pressure to spike.

You could also wire the fuel pump so that it only turns on while the key is in the ON position and not in the START position. I did this a couple years ago when I had low compresion in my old engine. Worked out great. Never flooded.

Fuel cut switch.

Spectator

iTrader: (1)

Yes, if you have low compression.

Whizbang

whats the mileage of the motor in question?

Aaron Cake

iTrader: (1)

Hot start problems in my experience are mainly caused by leaking or dirty injectors. The injectors drip (normally the secondaries) which floods out the engine. Sometimes you can even hear the sizzle of fuel after the engine has been shut off as the injectors drip...

ArExSeven88

some times it starts rite up somtimes it doesnt..it does start every single morning tho... and when it doesnt start i pull the second fuse under the hood crank the car over to unflood it..then put the fuse back in and it starts rite up..theres 85k miles on my car.. when the car starts tho it runs great..great power..not problems at all

rx7punk

My RX-7 is the same way, won't start unless you let it sit at least 6 hours or so. I'm not sure what the cause is but there is an easy solution. Take out the fuel injector fuse under the hood turn it over for 5 or 10 seconds and then put the fuse back in. You should be able to get it started this way. If it doesn't work the first time try it again and make sure you hold the gas to the floor.

RETed

Not necessarily true...

The engine is more prone to flooding when hot.
Compression is lower when hot; it's higher when cold.

Also, a weak electrical / battery on cranking can also cause flooding problems.


-Ted

Spectator

iTrader: (1)

How come?

ArExSeven88

yea when it doesnt start i take the fuse out and crank it over for about 10 seconds and it starts rite up

misterstyx69

iTrader: (142)

I have two N/A's.One car starts up like Clockwork..the other one,well it's Picky!..I Readjusted the Timing on it to Compensate for the Injectors.But As the Other Posters are Saying,If it is Flooding,it is injectors..If you let it sit Overnight the fuel is being Evaporated from the Internals,So YES it wil start up in the Morning..Take it From another "Flood Victim"..It's injectors..take them out and Get them Cleaned!

ArExSeven88

well i dont no how to clean the injectors myself so can somone tell me like a ball park figure how much it would be if i took somone to work on it? i hate letting other shops work on my cars n stuff but i dont no how to do it so i have no choice..thanks

eagleheart

mine would flood and would'nt start again then i started letting it idle for a minute or 2 before shutting off and it wouldnt flood anymore

imloggedin

i think its funny people immediately say bad compression when someone says 'my car floods'.

try this https://www.rx7club.com/2nd-generation-specific-1986-1992-17/looking-car-has-hot-start-problems-499744/