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Registered
Join Date: Dec 2003
Location: Roseville, CA
Posts: 7
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Check engine light - Closed loop temperature
A few days ago, I got the "check engine" light indication on my '98 328i. The car had no noticible changes in performance, so I odered a fault code reader and continued to drive the car with the indication. I got the reader yesterday and checked the code, which translated to "Time to closed loop temperature too long." I reset the check engine light and it has not come back on. Any ideas on what is going on? The car has 64,000 miles on it.
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12-13-2003, 04:34 PM
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Registered
Join Date: Jan 2003
Location: Dallas, TX
Posts: 24
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It looks like it's time to buy (and install) a new thermostat. What is the temp gauge doing? Does it go to the middle fast or do you have to drive for a long time? I am not sure how BMW monitors closed loop, it might be one of the O2 sensors, but then it will set a code for the O2 sensor...
Anyway, some additional info would be great. Watch the needle for the temp (in the dash) while the engine is cold. Does it take a long time to reach normal temperature? |
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12-15-2003, 06:49 AM
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Registered
Join Date: Dec 2003
Location: Roseville, CA
Posts: 7
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Thanks for the response Cristian. I had a new thermostat installed when the Inpsection II was performed at 61,000 miles, so I am assuming that it is working properly. However, I'm not sure if the temperature input for closed loop operation comes from that thermostat (which drives the temp guage) or a different one. I'm sure the temp guage thermostat was the only one replaced. With the mornings getting colder, I have noticed that it takes longer for the engine to reach normal temperature. A contributing factor is that I set the climate control to 80 degrees when I start the car in the morning.
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12-15-2003, 07:55 PM
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Registered
Join Date: Jan 2003
Location: Dallas, TX
Posts: 24
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I think the DME switches to Closed Loop when coolant temp is >68F, O2 sensor starts to switch, and some other conditions, too.
I am still not sure about the thermostat, though. You can try and feel the upper radiator hose, before the engine has reached the normal temperature. Is the hose cold or warm? The other possible problem might be O2 sensor, but I like to believe that BMW engineers would trigger a sensor code when the sensor is bad, not the Closed Loop. I can't help you more than this, you will probably need to have the car scanned (watch for O2 sensors responses when engine is warming up) or wait for warmer temp. Do you know what thermostat you had installed (brand and temperature)? |
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12-16-2003, 06:19 AM
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Registered
Join Date: Aug 2003
Location: Mundelein, IL
Posts: 57
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Check your air temp sensor - its a sensor in your intake manifold...
__________________
1993 325IS Turbo T3/T04e M3 Cams |
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12-16-2003, 11:50 AM
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Registered
Join Date: Dec 2003
Location: Roseville, CA
Posts: 7
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Thanks Cristian and Geno for the responses. After living with this problem for a few weeks, I noticed that the heat from my climate control system was getting colder and colder. I put in a new thermostat last week (the old one was definitely broken) and the car has run perfectly ever since. The temperature comes up right to the middle of the gauge, my check engine light doesn't come on anymore, and I have real heat on cold mornings!
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02-10-2004, 03:18 PM
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In the shop at Pelican
Join Date: Aug 2002
Location: Los Angeles, CA
Posts: 10,459
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I was going to suggest thermostat, but it sounds like you got it..
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02-11-2004, 06:07 AM
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