Spirit Rx-7

iTrader: (15)

i have an s5 n/a fc, and every time i let it sit for 2 day, it would have a hard time starting, but it starts eventually when i give it some gas. but today, after letting it sit for more then 3 days, it wont start at all, it would just crank and back fire. what would be the cause of this? i tried pulling the egi fuse and cranking it to burn off some fuel, but it still just wont start, any help would be great, thanks!

BrettLinton7

iTrader: (33)

Roll it down a hill and try to bump start it. Sounds like it's flooding out and is severely flooded. Sometimes pulling the EGI fuse won't do much good if it's badly flooded.

HAILERS2

You can check for spark by looking at the tach needle making small movements while cranking the engine over. If the needle make small movements then you have spark.

You probably have fuel. Just a guess/assumption.

On a series five you should not have to pull any fuses to deflood. HOLDING the gas pedal to the floor while cranking prevents the fuel injectors from working til the engine actually starts up.

So? Doed the tach needle move at all or not?

Spirit Rx-7

iTrader: (15)

i have no hills close to me, so i would have to push it pretty far, haha

and yea, the needle does move, even at some point during cranking it almost turns over, but it keeps backfire and continue to crank, i'll remove the plugs tomorrow to see how they look. and i also tried having the pedal down all the way while cranking

HAILERS2

Buy a can of starter fluid. Spray in the airfilter for no more than two seconds.

Put the pedal to the floor. Start the engine. Repeat til it does start.

Spirit Rx-7

iTrader: (15)

ok, so i took the plugs off today, and the two trailing plugs were wet, and smelled like gas. so i dried them up, cranked the car with all plugs off and egi fuse off so all the fuel can come out, and it started right up.

well, it started like if it was runnin on one rotor til i revved it a little, and it ran smoothly again, so now its running normal. it also did smoke a big, but it went away after a drive.

so now my question is, what could of caused this? i wouldn't want to be starting it up every day just so it wont flood anymore, any suggestions? thanks!

Spirit-RE

iTrader: (25)

leaky injector?

Spirit Rx-7

iTrader: (15)

^ thats what i was thinking. is there a way to test it or check it to make sure it is leaking?

Spirit-RE

iTrader: (25)

Pull the injectors out still attached to the fuel rail, pressurize the system(fuel pump jumper plug), and watch for leaks. Maybe try leaving them overnight with a dish under them to see if they slowly leak.

Or send them out to get tested.

Spirit Rx-7

iTrader: (15)

sorry to bump an old thread, but i just got all my injectors replaced with rebuilt ones with new seals, and im still having the flooding problem after letting it sit for a few days

anyone have any ideas where i should start looking at?

beefhole

iTrader: (29)

How many miles are on the car? You could be losing compression.
Also, since it's flooded before (badly) and keeps flooding, you will want to change to some fresh oil. You can also check for error codes. You may want to look into testing the water temp sensor (back of water pump housing). If this sensor fails the car goes rich.

LunchboxCritter

iTrader: (9)

Do you move your car in your driveway much?
Always let your car get to operating temperature before shutting it off. If you must shut it down before it reaches OT then floor the gas peddle and hold it down at the exact moment you turn the key off (do not rev it while turning it off, just floor the peddle and hold it when you turn the key to off).

If your car does not want to start on the first try, hold your gas peddle to the floor. You do not have to pull any fuses, or the plugs on an S5 as holding the peddle all the way down will cut the fuel supply.

If your car continues to flood on a regular basis, then a compression check is highly suggested.

Spirit Rx-7

iTrader: (15)

thanks for the replies, my motor probably has around 20k into the rebuild already, and i always let it warm up before shutting it off. its my daily, so its running almost everyday

i'll definitely look into the water temp sensor, and do a compression test

Drift_Purple

iTrader: (2)

i had the same problem as you, just got mine fixed the past two weeks ago. but anyways try to unplug the mass air flow sensor wire then start it? Try that!

elmayimbe4eva27

iTrader: (2)

The car will not start with the MAF unplugged. Check the temp sensor and compression :-(

Drift_Purple

iTrader: (2)

well, i have a s5 n/a and mine started right up with it unplugged, but it ran crappy. my car had a good battery, spark and fuel. i changed my fuel pump and filter, but that was not the problem it just kept on cranking and not starting right up, i did my fuel injectors and vaccum lines. And the same thing happened again. If you have a bad maf sensor it will start right up. Cause when i plugged it back in my car just died completely.

Drift_Purple

iTrader: (2)

i just got a new maf sensor and that fixed my problem. but i had the same problems as spirit rx7 has. I knew my rx7 still ran a month ago, with a good compression and no high temps. also try to shake your maf sensor to see if it rattles if it does it's bad. but hold in the flab, then shake.

Spirit Rx-7

iTrader: (15)

was your problem also flooding after letting it sit for more then 2 days? my car starts right up everyday with no problems. i have an extra maf, and i hear some rattles when i shake it, so guess that wont help haha.

the only problem i have is letting it sit for more then a few days. i can start it everyday to avoid it, but it gets kind of annoying sometimes

Rob XX 7

iTrader: (8)

I would think about doing a MMO treatment, then when its all cleared up install fresh plugs and fresh oil. I have never had good luck with these cars and trying to clean spark plugs.
Check your TPS as well

you may want to compression test before any of this, save yourself some trouble.

Drift_Purple

iTrader: (2)

yeah, i used to drive my fc everyday, but until i moved i had to store it for a month, then when i try to get my fc running again, then it would not start only crank i tried everything you tried but nothing worked, the last thing i was going to try was the automatic transmission fluid thing on the buttom of both spark plugs. but nevermind, i guess you have a different problem then me, sorry!

Drift_Purple

iTrader: (2)

but anyways i would just check my tps and compression like what everyone else says.

Rob XX 7

iTrader: (8)

simple, and cheap

Spirit Rx-7

iTrader: (15)

ok so compression test came out to 110 front and 120 rear, so thats good. and i just recently change the tps too, changed the plugs hopefully that helps

flownaksala

I had similar problems with my 88 Turbo especially after driving it a while and then turning it off and restarting it after a few minutes. It would flood every time, I could smell the gas. I would have to let it sit for about 30 minutes then it would start right up again. The Mazda dealership said its fairly common on RX-7's with over 100 K on the engine and that compression can go down on a hot engine because the rotor housing seal is worn. I've has this car for 6 years and taken excellent care of it with oil changes every 3K miles. I actually use a car maintenance software program to manage all my maintenance on it and keep a detailed vehicle maintenance log so my car is always up to date on all its maintenance.I've discovered that is I just let the car run for a minute or two after driving it that this problem seems to disappear. I never have problems with cold starts so for now I will hold off on an engine rebuild.