Daewoo Lanos II - Fuel Consumption, Acceleration and O2

koh · Post by **koh** » Sat Mar 20, 2004 6:28 am

Hi guys,

I got a used 2001 Daewoo Lanos II, manual gear that has the following features that worried me. That is :

1) Poor fuel consumption - about 9 - 10 KM / Litres
Any suggestion to improve ? I had changed oil, spark plugs, air filter and fuel filter.

2) Poor pick up - From stationary to 1st gear, 1st gear to 2nd gear.
Especially switching lanes is a horror. The car from behind would have to slow down as my pick up is damm poor.

3) O2 sensor- Where is the exact location of this sensor ? I suspected the poor pickup is due to the 02 sensor faulty. But, I cannot find the sensor.

Any advise is appreciate. Thanks.

GsiTurbo · Post by **GsiTurbo** » Sat Mar 20, 2004 1:52 pm

Hmmm, there are a few things that you may want to check to improve the mileage:

- carefully check the timing
- replace the O2 sensor (connected to the exhaust manifold)
- replace the CTS sensor
- check for vacuum leaks

It also might be a good idea to get the error codes off the ECM - while I do not own Lanos myself, one of the members should be able to help you in regards to the procedure.

koh · Post by **koh** » Sun Mar 21, 2004 3:34 pm

Thanks for the reply.

I used to drive cars that are made without O2 sensor. Anyway, I went to the spare part distributor to ask for the O2 sensor. That guy claimed that O2 sensor need not to change unless there is a engine indicator warming sign.

By the way, what is CTS sensor ??

GsiTurbo · Post by **GsiTurbo** » Sun Mar 21, 2004 4:19 pm

CTS stands for Coolant Temperature Sensor - your engine computer monitors the value and adjusts the amount of the fuel the engine is getting. If the sensor, for example, is faulty and reads cool engine, when in fact is warm, as a result the computer will be providing more fuel than required causing flooding and rich engine condition. This will result in a poor fuel economy and poor acceleration.

richardmatalon · Post by **richardmatalon** » Thu May 06, 2004 1:51 am

If there is no check engine light, howwould you check the value of the ect sensor to see if that is the cuase of the problem. I own a 2000 nibuira, and i get bad gas milage aswell. sometimes only like 200 miles to the tank. Which , i think it has a 15 gallon tank so that would mean that I am getting around 13.3 mpg. Now, I have changed filters and plugs and i really don't know what is to blame, The o2 sensor is fine. So if anyone has any ideas, please do tell

DomWoo · Post by **DomWoo** » Mon May 17, 2004 10:00 pm

around town i get about 200 miles to a tank, so about 20mpg on the free way keeping it at around 80mph i get about 45-50mpg

kinda strang how that works but it does

also i would look into some way better spark plug wires, the stock plug wires are trash and dont go with any parts store replacment wire either, you will want something that is a highperformace wire 8mm-8.5mm

darkspeed415 · Post by **darkspeed415** » Tue May 18, 2004 11:07 pm

How is the O2 sensor connected? Screwed in or what?

philou · Post by **philou** » Tue Jun 08, 2004 3:33 pm

The sensor is supposed to be after your airbox, in the tube that is after it. Never changed it, i just saw it's location from a diagram, but i guess it's only a simple connector to remove it, else it would be hell to remake all plug each time.

DomWoo · Post by **DomWoo** » Tue Jun 08, 2004 4:29 pm

actaully the sensor right behind the airbox is a IAT sensor (intake air temp
)

philou · Post by **philou** » Tue Jun 08, 2004 8:45 pm

oh, sry, mistaken the sensor there

well, the o2 connector look like that on my ride,

|X|
|----------|
| 1 | 2 |
|-----|----|
| 3 | 4 |
|----|-----|

For the poor fuel economy, there the step listed in my ride manual :
---

=1
1. Inspect the air filter for excessive contamination.
2. Inspect for fuel system leaks.

=2
1. Inspect the spark plugs for excessive wear, insulation
cracks, improper gap, or heavy deposits.
2. Replace any faulty spark plugs.
3. Inspect the ignition wires for cracking, hardness, and
proper connections.

=3
1. Inspect the engine coolant level.
2. Check the thermostat for being always open or for an
incorrect heat range.
3. Replace the thermostat as needed.

=4
1. Check the transaxle shift pattern. Ensure all transaxle
gears are functioning.
2. Check the Torque Converter Clutch (TCC) operation
with a scan tool. The scan tool should indicate rpm drop
when the TCC is commanded on.
3. Check for proper calibration of the speedometer.
4. Check the brakes for dragging.
5. Check the cylinder compression.
6. Repair, replace, or adjust any components as needed.

-Hope that help