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Hi, I have a Honda civic(1.7) 2004 ex sedan and I’ve been experiencing a over heating problem.After running 40-50Km temperature indicator rise up. It’s more evident when car is running up hill, It over heats even leaving the car in parking mode on a slightly angle floor mode for 10-12 minutes.
Also I’m getting a check engine sign, secondary o2 sensor is the faulty part.
what should i do? is there a connection between faulty O2 sensor and the over heating issue ?
thanks
Kp
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The secondary O2 sensor really just tells the computer how efficiently your Catalytic Converter is operating. It has no real bearing on how the engine performs, or whether the car overheats.
Things to look for with overheating:
Radiator cap . . . if the seal is old, and it is leaking this will cause overheating
coolant level . . . kinda goes with number one, anything that causes even a slow coolant loss will eventually lead to overheating
radiator . . .. is it all blocked up with garbage, plastic bag(s), leaves etc.?
cooling fans . . . are they working, and working properly (sometimes they come on, but run slowly or intermittantly)
Thermostat sticking in the closed position (if you turn on your heat, does it work, and work good)
air trapped in the cooling system, especially if anyone has worked on it recently
bad head gasket causing combustion gas to get into the cooling system
water pump is a possibility, but I would go through everything else firstThanks Tomh for the quick reply.
Yeh there was a problem withe the radiator cap earlier and I replaced the cap. Earlier couldn’t drive more than 2-3 kms but after replacing the cap there’s a improvement now i can drive 30-40 without a problem.***could it be the head gasket or any other seal ?
but i have been using car like this for almost 1-2 years now, if its the gasket would it be possible to drive like this ?(30-40kms) for such a long time?**** I got checked both fans.. their RPM is fine
***Note. Since there’s be a heating issue (coolant level drops ,i have to fill the radiator every week or so) so my entire radiator is filled with tap water . :unsure:
If you keep topping off the cooling system. You may
have air in the system.Have you fixed the leak problem?http://www.ericthecarguy.com/faq/what-to-do-when-your-engine-overheats
Whoa there. Water is not cool. You need the 50/50 mixture for best heat capacity and transfer.
And if you have a leak in the system, it may not be able to hold proper pressure. You have to find and fix the leak first, then refill with 50/50, then see how it does.
A leak is often along the sides of the radiator, if you see antifreeze crystals at the black plastic to aluminum core seams, you need a new radiator.
[quote=”grg88″ post=73668]Whoa there. Water is not cool. You need the 50/50 mixture for best heat capacity and transfer.
And if you have a leak in the system, it may not be able to hold proper pressure. You have to find and fix the leak first, then refill with 50/50, then see how it does.
A leak is often along the sides of the radiator, if you see antifreeze crystals at the black plastic to aluminum core seams, you need a new radiator.[/quote]
It’s not true that you need a 50/50 mix. Water has the best heat transfer abilities. Yes, coolant does help with heat transfer but water has the best heat transfer abilities. Unfortunately water comes with impurities that can corrode the cooling system. It’s also lacking in the other additives that help lubricate and clean the cooling system. Antifreeze does what it says, prevents the coolant from freezing in the block. In fact it’s discovery was an accident. It was actually left over from other chemical processes and put into waste ponds. They saw that it never froze and decided to see if there were other uses for it. Before antifreeze people used to run alcohol and water in their cooling system.
If you have an overheating issue I STRONGLY suggest reading the article that College man posted. It has all the information you need to deal with an overheat issue.
http://www.ericthecarguy.com/faq/what-to-do-when-your-engine-overheats
Also, just because you have a code for an O2 sensor that does not mean the O2 sensor is bad. There are SEVERAL codes for O2 sensors and not all of them indicate a problem with the sensor. Many of them indicate a rich or lean condition that has nothing to do with the sensor. Don’t assume just because you have a code for something it means that part is bad. You must confirm and diagnose in order to know for sure.
http://www.ericthecarguy.com/faq/solving-automotive-performance-issues
Read the overheat article, I’m sure the answer to your problem is in there. Keep us posted on your progress.
My gosh, I read in some old car book long ago that antifreeze helped heat transfer, but I guess that was wrong. According to this: http://hellafunctional.com/?p=629. You lose like 12% with a 50/50 mix. Live and learn.
But 100% water is bad from a corrosion standpoint. Listen to Eric, he really knows his stuff.
“Also, just because you have a code for an O2 sensor that does not mean the O2 sensor is bad. There are SEVERAL codes for O2 sensors and not all of them indicate a problem with the sensor. Many of them indicate a rich or lean condition that has nothing to do with the sensor. Don’t assume just because you have a code for something it means that part is bad. You must confirm and diagnose in order to know for sure”
Then I’m getting a check engine sign? I checked several times with a ODB meter and its giving the same code pointing the secondary 02 sensor. so where could be the problem ?
regarding the overhearing issue I’m planing to burp my radiator 😛 :cheer: someone said there can be air in my system and in order to get the air out i have burp the system.don’t know that will work or not.Anyway I’m gonna give a try.coz every time i open my radiator cap i see small bubbles.
Eric you guys are doing a superb job.I learnt alot from this forum Thanks for that
Cheers
Kp[quote=”grg88″ post=73800]My gosh, I read in some old car book long ago that antifreeze helped heat transfer, but I guess that was wrong. According to this: http://hellafunctional.com/?p=629. You lose like 12% with a 50/50 mix. Live and learn.
But 100% water is bad from a corrosion standpoint. Listen to Eric, he really knows his stuff.[/quote]
antifreeze does raise the boiling temp slightly in a pressurized system, but water itself is the best coolant
Hi guys,
I went to a work shop and they serviced the Radiator and added coolant, replaced the radiator cap too.so far everything is OK.:unsure: now there’s a new problem, my check engine light is flashing time to time while driving.(my Check engine light was anyway on bcoz of a bad (secondary O2 sensor) )
any idea why check engine light is flashing? also I’m experiencing a rough/low ideal.
Thanks
KpIf the light is flashing as you drive it’s likely a misfire as College man pointed out. This means you will likely have other codes in the system that you can pull. I doubt the secondary O2 has anything to do with it. However, I’m beginning to suspect you might have a restricted exhaust. You might want to check for that problem. Here’s a video that might help.
Hi
actually problem was the bad spark plugs, my technician changed all the spark plugs, now car is running smoothly.but i didn’t run even 2000 Km with my old plug set if I’m not mistaken, why my spark plugs are going bad so often ? could it be something to do with my faulty secondary o2 sensor ?thanks
KpHonda cars are picky about plugs. A ways back I put in a set of name-brand USA-made plugs and a week later the misfiring started.
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