Eco Test Fail

DELO 5 · February 11, 2016

Model Toyota AE 100 Petrol

YOM 91

Reconditioned

Issue. hi CO values ( Idle 5.5/ RPM 5.78)

did EFI tune up and changed Oxygen senser, Air filter, spark plug, petrol filter, and finally get through the eco test. but they told that CO figures are in bad sector. mine was 3.53/ 3.12. further it is observed that whit smoke comes out from tail pipe and mechanics told me that oil has come to the inlet manifold. they told me to replace a carbon kit and do following.

Face the cylinder head

cut and seat valve

replace piston rings and gas-cut

or go for overhaul

At the movement engine runs fine but less fuel efficient (8-10 kmpl)

Please throw some light

Edited February 15, 2016 by DELO 5

Davy · February 11, 2016

High CO values means that your engine is running rich. The most probable causes are a failed Oxygen Sensor or a Coolant Temperature Sensor reading "cold" always. Since replacing the Oxygen Sensor seems to have dramatically reduced the CO level, It was probably bad.

Before determining if an overhaul is actually required, what's the mileage on the car?

Twin Turbo · February 11, 2016

.If you car has been modded to run cooler by removing the thermostat valve and or running the radiator fan full time. the ECU will think the engine needs warming up and increase the fuel ratio to the engine continuously.

Check if the engine is running cool after reaching operating temp .

Edited February 12, 2016 by Twin Turbo

Twin Turbo · February 11, 2016

.Do you have the catalytic converter in the exhaust?

If my calculations are correct, your car is 25 years old. when did you last change the spark plug wires? Get a good set installed.Clean the air mass meter.

use regular petrol, add a cleaner bottle to the tank the next time you fill up.

Also , get a high Performance spark plug set. As a more powerful spark is useful in fully combustion of the fuel given to the engine.

These will be much cheaper than an engine overhaul which you will eventually need down the road.

Don''t worry abt the white smoke. is the engine burning oil?Then put a thicker viscosity oil next service.

Keep it cool and try these and check the emissions. the accuracy of the testing equipment is also questionable.So get the test first done from the tester who gave you the high results and go to another place and compare.

Edited February 12, 2016 by Twin Turbo

Twin Turbo · February 11, 2016

.It is highly possible that the white smoke is caused by oil burning in the combustion chamber Ger spark plugs of a higher heat range witth the other stuff together and get some more mileage till the inevitable overhaul.

Edited February 12, 2016 by Twin Turbo

Rumesh88 · February 12, 2016

Well it is a 25 year old car but if it has been maintained well and if the "genuine" mileage is still in the 200k range, perhaps you may have a few tens of thousands of kms still left before going for a full overhaul. However, you can get a compression test done with a handheld meter to decide on the condition of the valves and piston rings. For a detailed discussion refer to http://forum.autolanka.com/topic/16061-engine-oil-level-reduces-and-white-smoke-after-overhaul/?hl=%2Bpiston+%2Bcrown#entry261716 .

Depending on the results of the test decide on what to do. If the compression level is acceptable but still you have white smoke it could be due to bad valve guides.

Also at this age of the engine there are few things that could make a difference in performance in addition to those others have pointed out above but sometimes simply ignored.

1. PCV valve - was the PCV cleaned and tested during the last tune up? How to test is explained here - http://forum.autolanka.com/topic/17113-engine-miss-petrol-smell-in-cold-start/?hl=taut#entry282647

2. Condition of oil baffles inside the cam cover - usually the oil paths on the cam cover require cleaning.

3. Perhaps your injectors may need cleaning and, more importantly, tested for their uniform operation.

MV-5 · February 12, 2016

On 2/11/2016 at 11:58 PM, Twin Turbo said:
High Co levels are a direct result of incomplete combustion of fuel.Do you have the catalytic converter in the exhaust?
If my calculations are correct, your car is 25 years old. when did you last change the spark plug wires? Get a good set installed.Clean the air mass meter.

use regular petrol, add a cleaner bottle to the tank the next time you fill up.

Also , get a high Performance spark plug set. As a more powerful spark is useful in fully combustion of the fuel given to the engine.

These will be much cheaper than an engine overhaul which you will eventually need down the road.

Don''t worry abt the white smoke. is the engine burning oil?Then put a thicker viscosity oil next service.

Keep it cool and try these and check the emissions. the accuracy of the testing equipment is also questionable.So get the test first done from the tester who gave you the high results and go to another place and compare.

BS!

@DELO 5

if HC is in normal range, CO2 is low and CO is high ,Ignore this BS and try to stick with other members input (Davy and Rumesh).

This is due to rich mixture. that means EFI system doesn't know that it is rich (Oxygen sensor) or EFI system cant control the air intake or fuel injection properly (flows are not uniform).

Edited February 12, 2016 by MV-5

Rumesh88 · February 12, 2016

On 2/11/2016 at 2:55 PM, DELO 5 said:
Model Toyota AE 100 Petrol
YOM 91

Reconditioned

Issue. hi CO values ( Idle 5.5/ RPM 5.78)

did EFI tune up and changed Oxygen senser, Air filter, spark plug, petrol filter, and finally get through the eco test. but they told that CO figures are in bad sector. mine was 3.53/ 3.12. further it is observed that whit smoke comes out from tail pipe and mechanics told me that has come to the inlet manifold. they told me to replace a carbon kit and do following.

Forgot to leave a line of justification for my comments in the previous post. If oil has reached the inlet manifold through the breather hose then it is a good indication of the PCV valve not functioning properly and/or oil baffles being clogged up.

Twin Turbo · February 12, 2016

On 2/12/2016 at 7:13 AM, MV-5 said:
BS!
@DELO 5

if HC is in normal range, CO2 is low and CO is high ,Ignore this BS and try to stick with other members input (Davy and Rumesh).

This is due to rich mixture. that means EFI system doesn't know that it is rich (Oxygen sensor) or EFI system cant control the air intake or fuel injection properly (flows are not uniform).

Since when did High Co levels become legal anywhere on Earth? + The dude failed his emissions test because of "Issue. hi CO values ( Idle 5.5/ RPM 5.78)

Edited February 12, 2016 by Twin Turbo

DELO 5 · February 14, 2016

On 2/11/2016 at 11:27 PM, Davy said:
High CO values means that your engine is running rich. The most probable causes are a failed Oxygen Sensor or a Coolant Temperature Sensor reading "cold" always. Since replacing the Oxygen Sensor seems to have dramatically reduced the CO level, It was probably bad.
Before determining if an overhaul is actually required, what's the mileage on the car?

ODO is showing 91035 at the movement . Im not sure it may modified. I brought this 3 months back.

DELO 5 · February 14, 2016

On 2/11/2016 at 11:58 PM, Twin Turbo said:
.Do you have the catalytic converter in the exhaust?
If my calculations are correct, your car is 25 years old. when did you last change the spark plug wires? Get a good set installed.Clean the air mass meter.

use regular petrol, add a cleaner bottle to the tank the next time you fill up.

Also , get a high Performance spark plug set. As a more powerful spark is useful in fully combustion of the fuel given to the engine.

These will be much cheaper than an engine overhaul which you will eventually need down the road.

Don''t worry abt the white smoke. is the engine burning oil?Then put a thicker viscosity oil next service.

Keep it cool and try these and check the emissions. the accuracy of the testing equipment is also questionable.So get the test first done from the tester who gave you the high results and go to another place and compare.

I have changed 4 spark plug and replaced new NGK. mine YOM 91/YOR 94. engine is burning oil about 100ml per 1000-1200km. I'm not sure about the catalytic converter mine may not having one. I brought this resonantly and didn't change the plug wires as mechanics words that is not necessary.

Rumesh88 · February 15, 2016

On 2/14/2016 at 5:37 PM, DELO 5 said:
ODO is showing 91035 at the movement . Im not sure it may modified. I brought this 3 months back.

On 2/14/2016 at 5:47 PM, DELO 5 said:
I have changed 4 spark plug and replaced new NGK. mine YOM 91/YOR 94. engine is burning oil about 100ml per 1000-1200km. I'm not sure about the catalytic converter mine may not having one. I brought this resonantly and didn't change the plug wires as mechanics words that is not necessary.

YOM is 91 and ODO is at 91035. At least had the previous owner showed you ECO certificates for the last 10 years you could have believed in it.

DELO 5 · February 15, 2016

On 2/12/2016 at 7:38 AM, Rumesh88 said:
Forgot to leave a line of justification for my comments in the previous post. If oil has reached the inlet manifold through the breather hose then it is a good indication of the PCV valve not functioning properly and/or oil baffles being clogged up.

Yes there was oil in the inlet manifold, by mistakenly the word "oil" misses in my initial quote.