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Old 05-06-2017, 08:23 AM   #1
Fox Fader
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Most Likely Thermostat

51 degree morning running down the hiway (6 miles), stopped at my cousins for 10 minutes, temp gauge went up a bit, back on the hiway and temp gauge drops a bit. Points to thermostat. Only mentioning since this is my first BMW. Already had flush on the list, may as well add stat, 2 hoses and w/pump.

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Old 05-06-2017, 08:54 AM   #2
jfoj
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Nothing unusual: Temp Info - http://forum.e46fanatics.com/showthread.php?t=964491

Suggest if you do not have the OBDFusion App, you invest in the interface NOW. You will need it. You need to have visibility and without the interface it only delays things.

If you have a smart phone or table, get an OBDII App and interface so you can read the codes along with Live/Realtime or Freeze Frame data then you will know exactly what is going on with the engine fuel management system.

The OBDFusion App and proper VeePeak interface from Amazon are less than $30 for both for iProducts, less than $20 for both for Android

OBDFusion for Android is is $3.99.

https://www.amazon.com/Veepeak-Bluet...peak+bluetooth

OBDFusion, for the iProducts it is $9.99.

For iProducts you NEED a Wifi adapter or LE Bluetooth adapter which are more expensive and VeePeak does not offer these yet. If you choose LE Bluetooth interface, it MUST be one that is listed as supported on the OBDFusion web site. I think the Carista interface is the most reliable.

iProducts requires Wifi - https://www.amazon.com/dp/B00WPW6BAE...ywords=veepeak
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Solve your misfires, lean codes, rough idle - http://forum.e46fanatics.com/showthread.php?t=897616

Fuel pump failures - http://forum.e46fanatics.com/showthread.php?t=929501

Temp Info - http://forum.e46fanatics.com/showthread.php?t=964491

Hidden OBC Menu - Check Voltage, Temp, Fuel Level - http://forum.e46fanatics.com/showthread.php?t=239619

E46/E39 GM5 Door Lock Info - www.bmwgm5.com

Lower hose temp switch O-ring - BMW #13621743299
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Old 05-06-2017, 10:16 AM   #3
Fox Fader
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Yeah, I got a system that'll read live data on this car as well. Just got to pull it out with the old laptop. Got the ELM wifi adapter and stuff, guess I'll get the OBD fusion, Hell I may already have it. Checked with another guy's B, his gauge is at mid range on that run. With the car cooling down as I ran here again, I just decided to go on and get the stuff since it's prolly OE anyhow.
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Old 05-06-2017, 02:28 PM   #4
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Live gauge showed that when my needle's in that area, coolant was around 135 degrees F. Heat being barley warm this a.m. helped tell the story.
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Old 05-06-2017, 02:38 PM   #5
jfoj
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That's hell on the oil, fuel economy and engine wear. Check the rear bumper, license plate and trunk face for soot build up, not sure if the E46 will do this, but I know other cars will have black tail pipe tips and the back of the car will have a black film on it.
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Solve your misfires, lean codes, rough idle - http://forum.e46fanatics.com/showthread.php?t=897616

Fuel pump failures - http://forum.e46fanatics.com/showthread.php?t=929501

Temp Info - http://forum.e46fanatics.com/showthread.php?t=964491

Hidden OBC Menu - Check Voltage, Temp, Fuel Level - http://forum.e46fanatics.com/showthread.php?t=239619

E46/E39 GM5 Door Lock Info - www.bmwgm5.com

Lower hose temp switch O-ring - BMW #13621743299
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Old 05-06-2017, 02:44 PM   #6
Fox Fader
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Originally Posted by jfoj View Post
That's hell on the oil, fuel economy and engine wear. Check the rear bumper, license plate and trunk face for soot build up, not sure if the E46 will do this, but I know other cars will have black tail pipe tips and the back of the car will have a black film on it.
This is the first time this has started to happen. This hasn't happened on any other chilly morning. Caught it right in time.
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Old 05-06-2017, 04:51 PM   #7
jfoj
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Probably been having this problem for a while. Usually the P0128 code will pop, but this sometimes takes a while. If the ambient temp is at or above 70F usually the engine will get up to operating temp even with the soft thermostat. It will just take longer. The temperature gauge is buffered in these cars over like a 70F range and the needle will stay at the 12 o'clock position. So you will often miss the fact the engine is running cold.
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Solve your misfires, lean codes, rough idle - http://forum.e46fanatics.com/showthread.php?t=897616

Fuel pump failures - http://forum.e46fanatics.com/showthread.php?t=929501

Temp Info - http://forum.e46fanatics.com/showthread.php?t=964491

Hidden OBC Menu - Check Voltage, Temp, Fuel Level - http://forum.e46fanatics.com/showthread.php?t=239619

E46/E39 GM5 Door Lock Info - www.bmwgm5.com

Lower hose temp switch O-ring - BMW #13621743299

Last edited by jfoj; 05-06-2017 at 04:52 PM.
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Old 05-06-2017, 09:50 PM   #8
Fox Fader
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Originally Posted by jfoj View Post
Probably been having this problem for a while. Usually the P0128 code will pop, but this sometimes takes a while. If the ambient temp is at or above 70F usually the engine will get up to operating temp even with the soft thermostat. It will just take longer. The temperature gauge is buffered in these cars over like a 70F range and the needle will stay at the 12 o'clock position. So you will often miss the fact the engine is running cold.
Like I said, it has just started. Ive been keeping an eye, a close eye on almost everything on rhis car since I got it. It was going to normal temp reading every morning I drove it. Pretty simple.
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Old 05-06-2017, 10:07 PM   #9
jfoj
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Quote:
Originally Posted by Fox Fader View Post
Like I said, it has just started. Ive been keeping an eye, a close eye on almost everything on rhis car since I got it. It was going to normal temp reading every morning I drove it. Pretty simple.
Not sure you understand, the temperature gauge in these cars is BUFFERED. This means the gauge stays at the 12 o'clock position over a very wide temperature range, the gauge does not tell the truth. The engine could be running as low as 76C/170F and the needle will be at the 12 o'clock position and as I mentioned unless the ambient temps are much lower than 70F then you will never really know how cool the engine is actually running.
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Solve your misfires, lean codes, rough idle - http://forum.e46fanatics.com/showthread.php?t=897616

Fuel pump failures - http://forum.e46fanatics.com/showthread.php?t=929501

Temp Info - http://forum.e46fanatics.com/showthread.php?t=964491

Hidden OBC Menu - Check Voltage, Temp, Fuel Level - http://forum.e46fanatics.com/showthread.php?t=239619

E46/E39 GM5 Door Lock Info - www.bmwgm5.com

Lower hose temp switch O-ring - BMW #13621743299
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Old 05-07-2017, 12:20 AM   #10
SizzlerMA
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This sounds like what happened when my thermostat went. Goodbye $500 ...


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Old 05-08-2017, 08:04 AM   #11
Fox Fader
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Quote:
Originally Posted by jfoj View Post
Not sure you understand, the temperature gauge in these cars is BUFFERED. This means the gauge stays at the 12 o'clock position over a very wide temperature range, the gauge does not tell the truth. The engine could be running as low as 76C/170F and the needle will be at the 12 o'clock position and as I mentioned unless the ambient temps are much lower than 70F then you will never really know how cool the engine is actually running.
Dude, I've been doing this for over 30 years, LOL I'm just new to BMW.
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Old 05-08-2017, 08:57 AM   #12
jfoj
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That's why I wanted to make sure you understood how the coolant temperature gauge is buffered, it masks all sorts of low coolanttemp problems.
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Solve your misfires, lean codes, rough idle - http://forum.e46fanatics.com/showthread.php?t=897616

Fuel pump failures - http://forum.e46fanatics.com/showthread.php?t=929501

Temp Info - http://forum.e46fanatics.com/showthread.php?t=964491

Hidden OBC Menu - Check Voltage, Temp, Fuel Level - http://forum.e46fanatics.com/showthread.php?t=239619

E46/E39 GM5 Door Lock Info - www.bmwgm5.com

Lower hose temp switch O-ring - BMW #13621743299

Last edited by jfoj; 05-08-2017 at 09:20 AM.
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Old 05-08-2017, 09:09 AM   #13
Fox Fader
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We're Eye 2 Eye

I get you.
I was "there" when they dropped 'real time' gauges. My dad and others figured ways to make them real-time again. I did the same on an E-150 van I had. At this point, with obdII, laptops, android devices and apps I don't even sweat changing or adding gauges any more... Unless I get back on the track.
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Old 05-19-2017, 09:25 AM   #14
Fox Fader
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And it was passing thermostat. Car now gets to normal temp quickly and stays there like it's suppose to.
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Old 05-19-2017, 02:34 PM   #15
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Originally Posted by SizzlerMA View Post
This sounds like what happened when my thermostat went. Goodbye $500 ...


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Old 05-20-2017, 12:01 AM   #16
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Sorry to hijack thread, but I think I have a similar problem on my 2001 330i M54B30, only started this week I think, so today I connected up OBDFusion and did a log.

In the log I can see, after 5 minutes, the temperature reaches 71 degrees celcius (160F).
It then hovers around 71-76c (160-169F).
When the car then stand still in parking lot, it then stays at 75c (167F).

Outside temperature was 13c (55F).

Am I correct or wrong, optimal temperature should be average ~95c (203F), but normal for the gauge (in the middle) is anything from 75C-113C (167-235F) ?

So this looks like the engine is running cold, think I will just get the thermostat replaced and look what else needs replacing.
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Old 05-20-2017, 06:35 AM   #17
Jason325xi
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Originally Posted by Tinuva View Post
Sorry to hijack thread, but I think I have a similar problem on my 2001 330i M54B30, only started this week I think, so today I connected up OBDFusion and did a log.

In the log I can see, after 5 minutes, the temperature reaches 71 degrees celcius (160F).
It then hovers around 71-76c (160-169F).
When the car then stand still in parking lot, it then stays at 75c (167F).

Outside temperature was 13c (55F).

Am I correct or wrong, optimal temperature should be average ~95c (203F), but normal for the gauge (in the middle) is anything from 75C-113C (167-235F) ?

So this looks like the engine is running cold, think I will just get the thermostat replaced and look what else needs replacing.
Yup, sound like a soft thermostat. Seems like you know what's going on and how to handle it
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Old 05-20-2017, 06:51 AM   #18
Fox Fader
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How long did you let it sit still after the 5 minutes?
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10 Ford GT 401a 5sp 17k miles
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Old 05-20-2017, 09:23 AM   #19
Tinuva
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How long did you let it sit still after the 5 minutes?
I didn't record any data after turning off the car. Just leave the car like I would normally when not driving it. Should I record data after turning off the car?

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Old 05-20-2017, 09:25 AM   #20
Tinuva
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Yup, sound like a soft thermostat. Seems like you know what's going on and how to handle it
Thanks. Just hope i didn't drive it too long like this, should have bought obdfusion earlier.

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