Emission Test Failed, High Co Level In 5A-Fe Engine

djpra123 · August 27, 2012

Dear Experts,

This is the place which I usually lookup for tips and to get trusted advices on automotive throughout the years and finally time has come for me to put a major issue which I'm facing now that requires your help greatly...

I have a Toyota Sprinter Marino 1993 model 5A-FE (EFI) which failed 2 emission tests done in DriveGr**n. The attachment has the latest results. The problem is high CO levels in both idle and 2500 RPM. Car normally does around 9km/l city and I thought its normal for a manual Marino.

I have done a Engine tuneup in J*kis 7 months back and they did clean the throttle body, plugs were not replaced but adjusted and they cleaned the injectors just using the carb cleaner ( didn't attached to that measuring machine and checked even thought I was charged for it it seems ) . Small water drips started to appear from the silencer n made me happy so didn't go after it.

Now after like 8000kms when the emission test initially failed I showed my car to a person in Vidyala junction and he figured out that the Overflow to the petrol tank had a blockage and fixed it (some small particle was inside the metal tube near to the tank). No check engine light to show any sensor error. Also he did a self diagnose to identify if there is a sensor issue and non has problems. He checked the spark plugs and said the mixture is rich and the plugs are oki, and checked the throttle body which only had small amount of carbon. So he suggested not to do a full tuneup again. So I went for the test this Saturday and it failed with the below results for the second time.

Guys, What can be the issue here. I have used octane 95, VIC air filter, mobil 40 as well.

I have no option but to take this to a place in Raththanapitiya which has emission equipment and they charge 2500 just to find the fault and asked to come on a weekday which I cannot allocate due to circumstances.

1. Does this sounds as a fault in O2 sensor?

2. Do I need to replace the spark plugs?

3. Can this be a Dalco issue? Or to check the Dalco wiring and adjust Dalco?

Greatly appreciate your help.

Edited August 27, 2012 by djpra123

chinthaka5 · August 13, 2016

Hi Rumesh, thanks for the info didnt know it was the IACV, and nop we cleaned it after removing throttle body from manifold + we removed the manifold from the engine to cleat it too. thats how we found out that the line to IACV is blocked (filled with carbon deposit from bottom of the manifold to the valve)

car is running smooth now thanks to this thread and Mr.Dammika Fernando. he did a good job of tuning. he didnt have to remove anything to clean except for spark plugs and the air cleaner to inspect. I never seen a guy equipped with so much of tools and monitoring devices. according to him the valve timing is bit off (retarded) so have to fix that and that explained excess carbon deposit inside inlet manifold.

Thanks for sharing information guys.

for anyone who wish to visit Mr.Dammika he lives in Cotta road, no 129 when you coming from Boralla to Rajagiruya left hand side about 100m before the railway crossing. it is not a garage he does it at his home so dont look for a garage you will never find his place. and better get a appointment in advance he does only one vehicle at a time.

Budwin · May 26, 2020

I have the same problem in 2020.....what i have to do? Can u plz give me the mr dammika 's number??

pujithaj · March 21

On 9/3/2012 at 10:08 AM, djpra123 said:

Hi guys.. Emission test result came today as "PASS". The CO level is 0.023. I am really happy! Mr Dhammika is truly a class act. He is the only person I saw who knew exactly what to do regarding this. I had to wait almost a week to get an appointment but it is worth it (he didn't ruin my engine or waste lot of money for unnecessary replacements). Cost me Rs2500 including scans/emission tests etc etc which other ppl charge just to find the fault.

But as per his advice I have to replace the Lambda sensor (two wire type) and he said its hard to find. A used/second-hand one would be 6500 as per his comment and will take time to get.

Does anyone know a place to buy this 2 wire lambda sensor and is it worth to go for a brand new one which might not be with agents too?? (I have read previous post but dnt think they answer this question)

Tnx and keep up the good work guys...

Expand

Hi, I know that this thread is very old, but I'm posting my problem since I'm having the same problem and haven't solved it yet. I'm still struggling.

when I refer to the post , I can understand that the co lever was dropped to 0.023 and was advised to replace the o2 sensor.

can u pls. explain me how this was solved before replacing the o2 sensor? where was the error ? how did u manage to reduce the co level ?

pls. help on this.