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Car Forum / Honda Cars / March 2006What cause erratic idling before engine is fullly warmed-up?
Anyone has opinion what would cause the erratic idling before the engine reaches to a normal temperature? AFter the engine is fully warmed-up to normal temperature, the erratic idling is gone. The erratic idle only occurs during warm-up. I've heard something about oxygen sensor taking over (controlling) something after an engine fully warmed-up. > Anyone has opinion what would cause the erratic idling before the > engine reaches [quoted text clipped - 3 lines] > oxygen sensor taking over (controlling) something after an engine fully > warmed-up. -------------------------------- On Hondas one of the easiest things to look for is low coolant level. The rad has to be full to the very top, and the reservoir and (as an experiment) fill the reservoir to the MAX mark. Check it again next morning to see if it's missing some. If there's air in the system it will sip what it needs each time the engine cools, assuming the rad cap is working correctly. Many Hondas have an air purge nipple somewhere in the system. The heater core can trap some air too, so be sure to turn up the heat if you're trying to get air out. The presence of air in the system will give false readings to the computer because the temp sensors have to be immersed to work correctly, and if they aren't reading the coolant's temp correctly, the computer mis-adjusts things like ignition timing and fuel/air mixture. 'Curly' 'Curly' What model and year of Honda we talking about here? How many miles on it? What Curly said may solve the problem. I tend to urge doing a complete air purge, per the manual. One other possibility is a failing Idle Air Control Valve (or similarly named, e.g. EACV). That comes up here now and then. How old is your oxygen sensor, anyway? > Anyone has opinion what would cause the erratic idling > before the [quoted text clipped - 7 lines] > engine fully > warmed-up. 89 civic with 220K miles on it. I think my best guess I've found out it that the Coolant temperature sensor could be the problem. Where is the Coolant temp sensor in my car? The manual has no picture on it. what about Throttle Angle Sensor or Intake Air temperature sensor beside EACV? Is Curly saying that driving the car with turn the heater on would purge the air out? My oxygen senor is about 4 years old!. > Is Curly saying that driving the car with turn the heater on would > purge the air out? ------------------------ If there is air in the heater core, you may be able to get things back to normal by filling the rad and reservoir with Honda premix, drive it with the heater on, and see how much coolant it 'sips' from the reservoir overnight. Top up again and see if it keeps sucking it up next time it's cool. Instead of labeling the reservoir MAX and LOW, Honda should have labeled it MAX and WAY TOO LOW. :-) On an '89, try bleeding it from the purge nipple, but make sure you get the majority of it out as I've described, since you can't remove AIR if there's no coolant to displace it. 'Curly' > 89 civic with 220K miles on it. > [quoted text clipped - 4 lines] > my car? > The manual has no picture on it. Part #24 at http://www.hondaautomotiveparts.com/auto/jsp/mws/prddisplay.jsp?inputstate=5&cat cgry1=Civic&catcgry2=1989&catcgry3=4DR+LX&catcgry4=KA5MT&catcgry5=ENGINE+SUB+COR D-CLAMP See also the drawing at http://media.honda.co.uk/car/owner/media/manuals/CRXManual/62SH200/5-56.pdf Should be the same for your 89 Civic. > what about Throttle Angle Sensor or Intake Air > temperature sensor > beside EACV? The idle troubleshooting chart in my Chilton's manual for your 89 Civic says the coolant temperature sensor (a.k.a. "TW sensor") is the most likely cause. This chart appears in the free online manuals for your car at www.autozone.com , under "Emissions Controls." The Throttle angle Sensor and Intake Air Temp sensor may cause other problems not consistent with your symptoms (so far). It could be the TW sensor. I think that's come up here before and is in the newsgroup archives. I'd still do the air purge. I'd still keep the EACV in mind. These too have come up as the source of idle problems. Just not sure if they cause 'engine cold' idle problems. > Is Curly saying that driving the car with turn the heater > on would > purge the air out? > > My oxygen senor is about 4 years old!. Is it OEM? > > 89 civic with 220K miles on it. > > [quoted text clipped - 12 lines] > > Should be the same for your 89 Civic. Is TW sensor located under distributor? > > what about Throttle Angle Sensor or Intake Air > > temperature sensor [quoted text clipped - 24 lines] > > Is it OEM? Yes, it OEM. > Elle wrote: >> > 89 civic with 220K miles on it. [quoted text clipped - 17 lines] > > Is TW sensor located under distributor? Yes. It's called the "thermosensor" in the second link above. Are the links above not working for you for some reason? They are pretty clear about this sensor's location. >> > what about Throttle Angle Sensor or Intake Air >> > temperature sensor [quoted text clipped - 32 lines] > > Yes, it OEM. That's way too early for an oxygen sensor to fail, normally, then. I checked the ECU trouble code. I got code 16 which is a fuel injector system. I think the fuel injector system is contaminated. According to this -> http://media.honda.co.uk/car/owner/media/manuals/CRXManual/62SH220/6-59.pdf rough idle and frequent stalling during warming are the sympton of faulty injection. I have to clean the fuel injection system. That is the only thing I can do. I can't afford to replace the whole injector system. > I checked the ECU trouble code. I got code 16 which is a fuel injector > system. [quoted text clipped - 10 lines] > > I can't afford to replace the whole injector system. red cloud, you're a clinical retard. 10 minutes googling this group would tell you all you need to know because your questions have been answered here hundreds of times already. but instead, you waste hours trolling with increasingly asinine comments, the above being a great example. you need to sell this car and take the bus since you're too dumb to drive. and no, you can't post bus questions on this group. > I checked the ECU trouble code. I got code 16 which is a fuel injector > system. [quoted text clipped - 5 lines] > rough idle and frequent stalling during warming are the sympton of > faulty injection. ------------------------------- I don't recall you saying anything about __frequent stalling__ during warm-up. That's the symptom of tight intake valves, at least on a Gen 1 CR-V. Next symptom is a Check Engine light and a $1,500 repair bill. Have the valves been adjusted according to the maintenance schedule? 'Curly' I do not have stalling problem when I push the gas. During warming up, sometimes I say the engine is trying to cut off because the RPM drop almost to the bottom and rise back quickly. Is not that stalling? But the engine never has been cut off. I do not know about valve adjustment in the past. Thanks for telling me that. I've to consider that too. Well I've to find the way to check TW sensor and EACV sensor after I done something about ECU trouble code. |
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