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thanks again for the reply. You see i agree with you if I have two cats, but i only have one cat( i inspected it visually, and i don't see anything in the service manual either). My check engine light was flashing couple of times when i was in the free way, and as soon as i turned off the engine and...

What i am trying to figure out is that what is that second O2 sensor before the cat is doing. In usual case you have one O2 before cat and one after the cat.

I have one O2 sensor on the top of the exhaust manifold(under the hood), the second one is underneath right before the flex pipe(cat is in the middle and it is before the cat). I'll post a picture when i get a chance. I am here in US, California.

Darsh

Maybe you are right, but according to the service manual i only see one cat.

thanks
darsh

HI Daniel

What do you mean by sticky valves? What valve are you referring to?

Thanks

HI I have daewoo lanos 1999 1.6L. I was surprised to find out that i have two O2 sensors before the catalytic converter(bank 1 sensor 1 and bank 1 sensor 2). What make sense is to have one O2 sensor before the cat and one after the cat(to measure the cat's efficiency), but in my case i have two O2's...

THank you for the reply. Yes you are right. EGR can cause misfire. i had my ELmscan 5 was recording the data while i was driving, and i see manifold absolute pressure seems normal. I thought if it is a EGR problem then you loose the vacuum, eventually intake Manifold pressure will be high. I am goin...

Thanks for the reply. I have downloaded a free service manual, but it does not have it. However, it has two thousand some pages.

Hi I am new here i guess this is the right place to post this. I have check engine light flashing proble. It happens usually on the freeway. I did some searches and i found out that it is do to the misfire. I changed out my spark plugs and the ignition wires. I want to check the coil pack. Is there ...

Hi I am new here i guess this is the right place to post this. I have check engine light flashing proble. It happens usually on the freeway. I did some searches and i found out that it is do to the misfire. I changed out my spark plugs and the ignition wires. I want to check the coil pack. Is there ...