[Mazda_MX6_Turbo]

ok my car is running lean, my plugs are turning white, its my 3rd set of plugs now in 6 monthes, and im useing the stock NGK's v powers heat range 7, gapped at .040". i also have basically no mods, i have an air filter amd no muffler. im still running stock boost stock feul set up and no chip. i also had a freind tell me that my car is runing lean, casue i boosted while he was driving behind me, and he said that my exhasut gas smelled lean.

any way i can fix that??

 

[SD6]

Get a bigger fuel pump?

 

[Mazda_MX6_Turbo]

but still that not fixing the problem, u are trying to cover it with a bigger fuel pump, but the car would still be running lean stock, i wanna fix that problem. i dont want to go around the problem, casue if i add mods in the futur, the car will run lean after with the bigger pump and more boost. which ill end up saying my car is running lean still.

 

[Guest]

I'd like to know how your friend can smell a lean condition. Lean is the absense of fuel, and it really doesn't have a certian smell.

However, if your plugs are white, I'd look into replacing your O2 sensor. They go for about $18.

It could also be something as simple as a clogged fuel filter, or a failing fuel pump, a faulty FPR.

 

[el norm]

Hmm does you friend drive a more expensive car then yours and is yours still fasters? does your friend drive a honda? Is your friends car not turbo charged?

I think all these problems might be causing your friend to smell your car running lean.

 

[Methman]

Yeah Really you can't smell a Lean condition...sounds like your friend is a Honda driver. A lean condition is basicly too much air and not enough fuel...so how can you smell that...I think your friend has no idea what he's talking about.
Now if he could smell it while driving behind you, then mabey you really have a rich condition. White plugs could be due to excessive heat (but can also be due to running lean). Take another look at them and make sure they're not a tannish white because that would be normal. Usually the very tip of the plug (where the spark is produced) is always white this is because of the heat from the cylinder and the spark, what you want to look at is the base of the plug (the very bottom of the threads around the tip thing if its black/brown or tan there then there is nothing wrong with your A/F ratio. get your car to a dyno or buy a wideband A/F gauge...I think you will find out that there is noting wrong with your A/F ratio. Don't believe everything your Honda driving friends tell you, most Honda drivers like to think that they know everything about cars. I bet he talked to you like he knew 100% what he was talking about when he said "I can smell your car running lean" lol thats the dumbest thing I have ever heard.

methman

 

[Mazda_MX6_Turbo]

Hmm does you friend drive a more expensive car then yours and is yours still fasters? does your friend drive a honda? Is your friends car not turbo charged?

I think all these problems might be causing your friend to smell your car running lean.

lol nope he drives a 2nd gen PGT that is modded, and he is running a 75shot nitrous in it and he's doing 13's at the track.

 

[mx6GT91]

My plugs are slightly white also, Im thinkin of takin up what Flyswat said.

 

[LIVEWIRE]

I to have this problem.When my car was all stock the first thing i got was the zombe chip and boost& A/F gauge,everything was fine.Then I got a mbc set to 15psi 3"downpipe with 2.5" cat back exhaust.plus k&n drop in.at this point my car started leaning out in top of 4&5 gear.so I got a walbro 255 pump and FPR to fix my problem.what I mean is on my gauge you know red/yellow/green my A/F reading is always in the yellow (stoch) at least with the stock pump I would most of the time see a little green on the gauge. I only upgraded the pump because i plan on getting a bigger turbo.My FPR is set at 45psi I know stk is 37,38 so it shoud be enough.Besides all this, sometimes I notice it more on cool nights at full throttle at 15/16psi I get a slite ping.and I quickly let off the gas.

ANY IDEAS?

 

[MX6-88]

Lean fuel mix....

Hi.
I experimented this problem in my car five months ago.
First, I install a fuel pressure gage to see the fuel pressure. The reading was 45 to 55 psig. When I run the car in hard situations, the turbine glows very high red indicating a lean mix.

I solve this problem changing the original fuel regulator with a new original one.
When I see the fuel pressure using the new fuel regulator the reading now is 90-95 psig at idle. Now my car runs very good and the turbine does not glows any more.

See you.

 

[88MX6GT]

Besides all this, sometimes I notice it more on cool nights at full throttle at 15/16psi I get a slite ping.and I quickly let off the gas.
ANY IDEAS?

I am surprised your car does it "more on cool nights" b/c cars usually (especially turbo cars) run better when it is cool out b/c it keeps the intake air charge cooler, and pinging/detonation is more related to heat.

When I run the car in hard situations, the turbine glows very high red indicating a lean mix.
When I see the fuel pressure using the new fuel regulator the reading now is 90-95 psig at idle. Now my car runs very good and the turbine does not glows any more.

Turbine glow is from boosting a lot, it is very common if you've been boosting hard or for a long time to see the turbine side of the turbo glow red hot.

White plugs could be due to excessive heat (but can also be due to running lean).

excessive heat and a running lean condition go hand in hand. The heat is from running lean.

Sorry, didn't mean to come off as someone else on the board, just wanted to say a few things.

 

[SleepCounter]

back-handed, etc.

Sorry, didn't mean to come off as someone else on the board, just wanted to say a few things.

Sounded fine to me

 

[LIVEWIRE]

My FPR is not stock. Its an ajustable,aftermarket.I have no idea what my FR was,when I had the stock FPR.at the time I had no gauge.And yes your right when say that the turbo glows from long hard boosting.
What has me confused is a friend of mine has a 89gt turbo t-bird up grade,cone filter,2.5 cat back,adams chip,330inj,255pump running 18-20 psi with no adj FPR and stock downpipe.this car runs 20psi in 5gear with more than enough fuel and I never here it ping
not on a cold night or hot summer day.
could it be him having 330 inj in his car being a 89? with adams chip.

 

[LIVEWIRE]

I would like to solve this because I want to up grade my turbo but it seems the car will be worst off.because of the lean problem.

 

[cenatix]

I just pulled the o2 sensor housing from the turbo and the walls of the housing were all white. This is a sign of running severely lean, correct? My friend told me it was probably the additives used in the gasoline. I don't agree with him.

 

[mlp-mx6]

I am surprised your car does it "more on cool nights" b/c cars usually (especially turbo cars) run better when it is cool out b/c it keeps the intake air charge cooler, and pinging/detonation is more related to heat.
.

It totally makes sense to me. Cool air is much more dense. More dense = more oxygen in the air. Denser air means more fuel is needed to not go lean.

 

[LIVEWIRE]

lean problem

It totally makes sense to me. Cool air is much more dense. More dense = more oxygen in the air. Denser air means more fuel is needed to not go lean.

I know that.So why is my car running lean?:help:

Today I bought a fuel filter, fram#G7393 I read on a post that this is a higher flowing filter for my car.It could of been 2 years since it was changed so mabe thats my problem,well see?

 

[LIVEWIRE]

If that doesn't work I'm going to put my stock FPR back in just to see if that Ajt FPR I bought is defected.

 

[LIVEWIRE]

Still waiting if anyone has ideas or ran across this prob before.

 

[MSGT-R]

Before you go throwing money and extra parts at it, stop and do some rudimentary diagnosis first (especially if the problem is a new one).

LEAN can mean too much air, or not enough fuel. Assuming all things under the hood are unchanged from stock...

Things that can cause a lean condition:
Improper O2 sensor signal to the computer causing a change in injector on-time.
A vacuum leak somewhere in the intake tract.
Low fuel pressure: a clogged filter, weak pump or a bad pressure regulator.
You've suddenly developed an air-temp sensor problem in the VAF (very rare).
You left a major part of your exhaust system on the interstate.
You're driving around below sea level in the region of Death Valley known as Bad Water...(California, Arizona and Nevada residents only).
TORONTO? Too freakin' cold for people to live in! :angel: