lean!!

[yerrr22]

i have a 1990 tsi and it is running very lean at idle acordind to my wide band gauge. i have not driven it because it is so lean at idle. what could cause it to sudenly become so lean. it ran fine a few days ago?

 

[exiletalon]

i have a 1990 tsi and it is running very lean at idle acordind to my wide band gauge. i have not driven it because it is so lean at idle. what could cause it to sudenly become so lean. it ran fine a few days ago?

check your plugs, if they are fouled then look into new plugs and wires- if they are fine- check your wide band connection to see if it is loose or touching something

 

[yerrr22]

thanks ill check those first thing in the morning

 

[SpoolingSpyder]

thanks ill check those first thing in the morning

Did you fix your problem?

 

[Irrational]

What is Lean at Idle to you? what is the guage reading?

 

[DevilSperm]

How new is your o2 sensor? If its shot it will read .00 or .02 at idle which will tell the ecu its lean, which in turn will add more fuel. So basically you would be running rich while reading lean.

 

[yerrr22]

my wideband gauge just says LEAN. I replaced the o2, checked all connections, replaced the plugs and wires and i still have the same problem.

 

[Irrational]

reset the ECU and see what that does.
What wideband is it?
what happins if you rev it in nutral ?
What 02 did u replace the stock one or WB?
Did this just happin one mornig or did u work on the car then it did this?

 

[yerrr22]

happy birthday to me!!
i have the plx300 wideband. that is the only o2 that i have. ill try resetting the ecu tomarrow. when it started saying lean i had just replaced a leaking boost controller.

 

[Irrational]

OldMan- came to me in a dream last night and said "BOOST LEEK TEST IT "

 

[95blackGsTurbo]

happy birthday to me!!
i have the plx300 wideband. that is the only o2 that i have. ill try resetting the ecu tomarrow. when it started saying lean i had just replaced a leaking boost controller.

You aren't supose to replace your o2 sensor with the wideband. You put it downstream from the stock one. You did leave a stock one in there hooked up didn't you?

 

[DevilSperm]

hes probably using the narrowband option of it.

 

[Irrational]

You aren't supose to replace your o2 sensor with the wideband. You put it downstream from the stock one. You did leave a stock one in there hooked up didn't you?

If thats the case. You should not have your WB 02 so close to the turbo thats to hot and will cause it to break pre maturely.