H22 in a 97 4dr civic. In hot weather 80+ my car is very hard to start and when it does it's extremely rich. What gives? In cold or non sunny weather it fires right up. What should I be looking for?

 

How do you know its running rich?

 

Because of the unburnt fuel spitting out of the exhaust. And it's black smoke. And smells of raw fuel.

 

What ecu are you running?

 

Chipped p28 with a stock h22 tune. I'm wondering if the evap is not working properly and causing bad fueling on hot day start ups. If it's hot but rainy it doesn't do it. And if you kill it and fire it up 5 mins later it's good. But if it sit for 30 mins or so in the sun it will do it gain.

 

I have a 97 dx. Started having similar issues, the car will start if it's been sitting long enough for the engine to cool all the way down. Run the car up to temp, shut it off and try to restart and it just cranks. I've figured out that it's getting excessive fuel and that's the reason for the start trouble. I was checking my fuel pump and decided to see what would happen if I disconnected the pump. Did do andit fired up within a few seconds. I'm trying to figure out what's causing it to dump so much fuel in. When the engine is warm it'll just crank and I smell raw fuel. It also started idling high when it was hot. Cleaned out the IACV and it helped with the idling but not the no start when hot problem. I can get it to start once the engine has cranked long enough for the battery to run down almost completely. My guess is that it starts when the fuel pump doesn't have enough battery power to dump all the excess gas in it.