Viegasjuice

iTrader: (1)

Have an evo 8 with buschur racing exhaust and it hasnt been tuned. Afr idle jumps from 14.0- high 17's sometimes I just get --- I have the aem gauges. Theres also white smoke out the exhaust. Car has service engine light because it runs rich. Will just a simple tune up fix my problem?

adriano_917

iTrader: (14)

In a simple answear, yes a tune can fix that.

Viegasjuice

iTrader: (1)

Nothing seems like a red flag?

adriano_917

iTrader: (14)

Have you checked the engine light, If so whats the code ? White smoke can be related to burning coolant.

adriano_917

iTrader: (14)

The afr that you mentioned, is that at idle ? It should be bouncing from 14.5 - 15.3, at 17 thats way too lean!

Viegasjuice

iTrader: (1)

Yeah. On cold idle. Will a tune handle this issue?

asu11

iTrader: (7)

First I would get it tuned if haven't already. If the issues still is there, I am sure the tuner would help you figure it out by what code its throwing. As for AFR during idle, sometimes it can go lean for a second or two, no big deal.

Viegasjuice

iTrader: (1)

The inspector ran it and its throwing a code because its running rich. It only jumps to 17 momentarily. Its usally under 15.5. Im completely new to evos so im tryna learn all i can.

chrisw

iTrader: (2)

No a simple tune will not fix the problem. sounds like you have a boost leak. You need to diagnose the problem more before retuning the car.

BEKevo

iTrader: (2)

Scan & retrieve the code. That will tell you the direct problem, most likely 02 sensor

BEKevo

iTrader: (2)

White smoke could be from a coolant leak (ie headgasket), clogged PCV or a ****ed up catch can install/plumbing, or many other things. If you have no cat (ie test pipe) and the temps around your area are low, catless cars tend to puff white smoke for a bit longer than usual during warm up

Viegasjuice

iTrader: (1)

I have no cat. Im assuming its the o2. Are any of those leaks expensive to fix?

BEKevo

iTrader: (2)

Not expensive, just time consuming. Really lean AFR's can also puff some white smoke.. If your AFR is outta wack, its most likely your 02.. And yes a tune theoretically could fix your AFR (ie tune completely in open loop), but I doubt you want the problems associated with running open loop 24/7...

Before you purchase your front/primary 02 (which i think is the culprit of your bad AFR), you can read the voltage being supplied to the 02 via a logger, if the readings are all over the place (ie volts) then your primary 02 is bad...

Viegasjuice

iTrader: (1)

Thank for the help! Im a damn noob when it comes to evo/turbo cars in general. Does what you mentioned sound portentially damaging to the car? And do any of these symptoms sound like a turbo going bad. Theres 102k on the car