can an safc help me fix my problem?

[Deadly BlaZe]

my car is pretty much stock. The car runs VERY rich. Like for example: I washed my car on monday, by sunday the rear bumper was really dirty from the unburned fuel, and by next week, it looks like i have an unfinished black paint job on my bumper. Yes its that bad. Im thinking its just my o2 sensor but if its not, is it possible to tune an safc so that the car won't run rich? I'm not sure if it's ok to do this on a car that's stock. Thanks

 

[weith1111]

An AFC can help you, but you are on a much better track fixing what's broken. You know the car is not supposed to operate that way, and using an AFC to correct it would just be a bandaid. Get a logger on there and see what's going on. More than likely the o2 is shot, at a minimum.

 

[Deadly BlaZe]

An AFC can help you, but you are on a much better track fixing what's broken. You know the car is not supposed to operate that way, and using an AFC to correct it would just be a bandaid. Get a logger on there and see what's going on. More than likely the o2 is shot, at a minimum.

should the car still run that rich with a small boost leak, because im sure i have a small leak, but should it still run that rich? (assuming the o2 sensor is fine).

 

[weith1111]

I'd gaurantee if you've never leak tested your car, you have more than ONE small leak. Probably MANY small leaks. And yes they have a pretty big effect. Fuel is getting added for all that air that isn't making it to the cylinders=rich rich rich. If the o2 is older than 60 or 70k miles it's could be no good. I'd check both of these things out and you should be good.

 

[Deadly BlaZe]

I'd gaurantee if you've never leak tested your car, you have more than ONE small leak. Probably MANY small leaks. And yes they have a pretty big effect. Fuel is getting added for all that air that isn't making it to the cylinders=rich rich rich. If the o2 is older than 60 or 70k miles it's could be no good. I'd check both of these things out and you should be good.

i have done a boost leak test. i pressurized it at 10 psi. The only places i heard leaks was from the 4 vacuum things(sorry cant think of the right name) on the throttle body. There were some SMALL leaks from hoses not being tightned down and after i tightned them down my boost did go up by 3psi and spooled quicker (9.5psi @ 3.3k). Other than that though, nothing. I will check on that o2 sensor though. Are there any other things that cause it to run rich?

 

[Alibi]

Boost leak tests should be done around 15-20 psi just to be safe. If it holds 20 for 30 seconds, then ## good. Just FYI

 

[Deadly BlaZe]

Boost leak tests should be done around 15-20 psi just to be safe. If it holds 20 for 30 seconds, then ## good. Just FYI

what do you mean by 'if it holds 20 for 30 seconds'? what do you mean by hold?

 

[Alibi]

I'm sorry, if it holds 20 psi for 30 seconds. Meaning dosent lose any pressure, and dont assume because you cant hear a leak its not there. I'd do the soapy water trick.

 

[Deadly BlaZe]

I'm sorry, if it holds 20 psi for 30 seconds. Meaning dosent lose any pressure, and dont assume because you cant hear a leak its not there. I'd do the soapy water trick.

if it doesn't lose pressure what does that mean? that it's safe to hold it with 20 psi?

 

[Alibi]

Its just making sure you dont have any boost leaks. If you can hold 20 psi on a boost leak test then you can for sure hold the 10-15 psi you are boosting during actual driving.

 

[Deadly BlaZe]

Its just making sure you dont have any boost leaks. If you can hold 20 psi on a boost leak test then you can for sure hold the 10-15 psi you are boosting during actual driving.

aaah i see. thanks for the info. Back to the afc thing. Couldn't i just tune it so that the car pumps less fuel to make the a/f ratio even? or is it not ok to do while stock? btw i have no idea how an afc works, so don't flame me if what i said isn't even possible to do at all (just knowledge from i've been reading on here).

 

[weith1111]

Listen bud, you can do whatever you want. I could put a blower on an engine with 2 melted pistons and make more horsepower. This is how asinine it is to keep asking if you should get an AFC to fix your car. Fix what's broken:

How many miles are on the o2 sensor?

You should be getting more than 9.5 psi of boost. You are still leaking a few pounds. Boost leak test again at 20 psi and listen carefully (no music or compressor on) or use soapy water. Many leaks won't even appear until the lines are stressed enough (20 psi should do the trick). To demonstrate I used to bog down when hitting full boost, turns out I was pushing my IC pipe off my intercooler at 20psi and up. If I was leak testing at 10psi I would have never found the leak.

 

[Pitman99505]

weith1111 An AFC can help you, but you are on a much better track fixing what's broken. You know the car is not supposed to operate that way, and using an AFC to correct it would just be a bandaid. Get a logger on there and see what's going on. More than likely the o2 is shot, at a minimum.

Listen to the advice that has already been giving. Forget about the a temporary fix, you want to fix the problem! You car should NOT be running like that in stock form. That is a bad thing if it is doing that. If it is something that is major and you band-aid it, it will get worse and may cost you a lot more to fix the second time than fixing it the first.

1. Get the logger
2. Boost leak test
3. Compression test
4. Depending on the results from the compression test, a leak down test.

Take the advice already given by many, once you have began to do these test, post the results and many people would be happy to help you diagnose your problem so you can fix your car and get it running right.

 

[xcz504d]

AFC wont necessarily fix your fuel trims anyways, the AFC adjust the MAF signal, not the o2 signal. An AFC is more expensive than a $70 o2 sensor and another $10 for the special tool to remove the o2 sensor...