Engine new SRI installed...

new SRI installed...

OK, I ordered an ebay short ram intake for my '03 Corolla. I'm happy to say that it doesn't ping like it did with the AEM CAI. However, I paid $29.95 for the intake and being that it was cheap in price, it is also cheap in quality. I was a little perturbed to find that there's no connection for the EVAP valve. You know - the one that connects to the stock airbox. It's just not there. The pipe only has one fitting - and that's for the MAF sensor.

The VSV (upper one that ticks all the time) connects the charcoal canister to the intake manifold, right??? It routes fuel vapors into the engine.

The EVAP valve (the lower one), opens up and equalizes pressure in the gas tank, right? Because the VSV opens and manifold vacuum creates a vacuum in the gas tank so the EVAP valve opens to equalize the pressure?? Is that how it works?? Because I can feel it sucking air into the hose while idling (intermittently) since it's just disconnected right now. And it connects BEFORE the MAF sensor, so the air it sucks in is not metered. So, I could just buy a little filter for it, right?? Same difference?? The only purpose there is for it being connected to the intake is so the air is filtered??

What do you all think??? Am I understanding this correctly??

Thanks,
Trav

Am I on the right track??

Late,
Trav

you cant just put a filter on it. The engine sucks air through the intake providing the nessasary amount of air to be drawn into the hose. You dont want it to be sucking hot air either.

there's nothing wrong with hot air, you'll just be losing maybe 1-1.5 horsepower...actually, i discoverd (at least on my 96) having a CAI drastically dropped the gas mileage...

Eh...I agree with not wanting the EVAP valve to suck in hot air. That makes good sense. However, I don't understand how the amount of air coming through the intake has anything to do with how much air enters the EVAP valve. The EVAP valve opens and closes randomly and the air is not metered by the MAF sensor.

And I don't have a CAI anymore. It's a short-ram. HP/torque improvements are proven by dyno and from what I've heard, actually produce a bit more power. The front end of the Corolla is very open and allows for lots of airflow so it should cool things off quite well once moving.

Trav

I'm not certain how the '02 models are setup, but I'd assume it's the same.

I'd look at the gas cap or just replace it. The valves that connects to the intake manifold is the one that vents fuel vapors. The other one simply lets air into the gas tank so you don't build up a vacuum in the tank - that's the one that connects to the intake tube. So, you're probably not venting anything unless you've disconnected the one that goes to the intake manifold. The fault code with the purge valve overflow would make me think it's the gas cap or perhaps a hole in one of the vacuum hoses.

Late,
Trav

I've been having EVAP problems on my 02 for 5 months now. It pulls a code 0441-EVAP purge control overflow fault. I've tried many different things to remedy this because the problem is also making me run rich and I'm only getting 24mpg combined.

One of the things I did was pull the evap hose out of the Injen intake, capped off the hole in the intake, and zip tied the EVAP hose onto the chassis. Nothing bad happened. The car ran the same if not a little better. Yeah, I was probably venting fuel fumes into the atmosphere when the valve opened, but I'm not a tree-hugger so its ok.

Try it out and if you don't notice anything bad, no problem. Adding a filter to it externally will do you know good. Or just drill a hole in your intake!