xHart90TIIx

First off let me say hello to everyone. The car I am posting about is my third RX-7(My first one turbo'd!). I love the cars and don't see myself driving anything else. Well here we go. When starting the RX7 from a cold start (ex: In the morning or after letting it sit for an hour or so) It will start up fine. But after the engine warms up and you turn it off for 5 minutes to run into the store for something and come back and try to start it, it will almost turn over but then act like its flooded. Heres the interesting part though if you go under the hood and pull out the EGI INJ fuse and turn it over a hand full of times and let it sit for 5 minutes after putting the fuse back in it will start up fine. It's an RX-7 Turbo2 10th Anniversary and guy who I got the car from had changed the ECU and a few other things but nothing too major.. (Racing wires, blow off valve, intake ect) so I am not sure if that would have anything to do with it but it's more of a pain in the *** then anything. I wanted to check here before taking it to the shop and have them poke their heads around and go "Oh yeah its just.." something simple and stupid. Hope to get some answers! Thanks for reading.

RotaryRocket88

iTrader: (7)

Very common. Search for "hot start" and you'll find lots of threads with info on the subject.

It is flooding like you're guessing. Sometimes this is due to dirty injectors leaking after the engine has been turned off, but a lot of it is just due to the way Mazda tuned the start map. Engine temperature determines the amount of fuel injected when cranking, and Mazda opted to err on the rich side instead of leaning it out.

If the problem can't be solved by cleaning the injectors, then some go so far as to wire in a kill switch for the fuel pump. I had this on my TII, and it made hot starting very easy. An alternative would be something like my Rtek chipped ECU, which turns off the fuel pump if the throttle is opened all the way.