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#4613911 - 12/25/17 02:07 PM Safe to drive on unplugged coolant temp sensor?
Hemispheres Offline


Registered: 01/14/17
Posts: 381
Loc: Virginia
So I finally got all my exhaust leaks fixed, however Iím the process of pulling the rear manifold with the crossover pipe connected I managed to whack my coolant temp sensor and bust the female connector. Iíll be replacing it tomorrow but first I need to drive about 60-70 miles (mostly interstate).

Iím already having related issues such as both radiator fans running constantly, abrupt TCC engagement aside from running rich. I can literally smell raw fuel on startup. Other than that the temp gauge sits at 0 but Iím not having any driveability issues. My main concern is hydro/vaporlock or engine flooding/oil contamination. Are any of these a serious possibility in such a short timeframe?
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#4613927 - 12/25/17 02:20 PM Re: Safe to drive on unplugged coolant temp sensor? [Re: Hemispheres]
George7941 Offline


Registered: 05/10/05
Posts: 2158
Loc: Toronto, Canada
I wonder what temp the ECM thinks the engine is at. A scan tool will reveal that. The fact that the rad fans are on indicates the ECM thinks the engine is hot but then the engine will not be running rich. Maybe the fans are not controlled by the ECM and is an unrelated problem.
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#4613934 - 12/25/17 02:29 PM Re: Safe to drive on unplugged coolant temp sensor? [Re: Hemispheres]
Hemispheres Offline


Registered: 01/14/17
Posts: 381
Loc: Virginia
Had no issue before busting the sensor, and the heater seems to feel a bit cool at 80 degrees but almost uncomfortable on my hands at 90 degrees.

It may be running lean, I do remember after warming up the engine would stumble upon startup followed by the gas smell. However Iím running 93 octane on light mods and a stock tune. 87 nets me better mileage as long as I stay out of the mid to upper RPM range. Raw fuel smell would lead me to believe itís a rich mixture.
_________________________
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PZ Plat HM/Mobil 1 HM
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#4613942 - 12/25/17 02:41 PM Re: Safe to drive on unplugged coolant temp sensor? [Re: Hemispheres]
George7941 Offline


Registered: 05/10/05
Posts: 2158
Loc: Toronto, Canada
Perhaps it is running lean and the raw fuel smell is from unburned fuel caused by misfiring.
_________________________
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#4613983 - 12/25/17 03:14 PM Re: Safe to drive on unplugged coolant temp sensor? [Re: Hemispheres]
Hemispheres Offline


Registered: 01/14/17
Posts: 381
Loc: Virginia
Hmm. Could be. Not noticing any black smoke from the exhaust thatís characteristic of a rich condition but not noticing any sluggishness/timing pulled either.

However the only code was p0118. No misfire or lean/rich codes. Just checked, p0118 is high resistance. High resistance occurs in the sensor on a cold engine so Iím running rich due to the pcm thinking my engine isnít warming up.


Edited by Hemispheres (12/25/17 03:24 PM)
_________________________
2009 Buick LaCrosse (3800 Series III) - 137,000 miles.
PZ Plat HM/Mobil 1 HM
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#4613992 - 12/25/17 03:27 PM Re: Safe to drive on unplugged coolant temp sensor? [Re: Hemispheres]
eljefino Offline


Registered: 06/15/03
Posts: 32635
Loc: ME
Scantool might not tell you the default temp... it'll probably be 68 or 180, LOL.

Is there no way to rig what's left of the wiring to the pins from the sensor? Even without the plastic you might be able to get the pins in there.

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#4614002 - 12/25/17 03:43 PM Re: Safe to drive on unplugged coolant temp sensor? [Re: Hemispheres]
Hemispheres Offline


Registered: 01/14/17
Posts: 381
Loc: Virginia
Unfortunately my BAFX Bluetooth OBDII tool bit the dust. Somehow a couple resistors are loose. Still attached to the MB but wiggles a bit and wonít connect to the PCM or link via Bluetooth.

I know the thermostat opens at 185Ė190. The pigtail is fine however the sensor prongs are busted and a chunk is busted off.


Edited by Hemispheres (12/25/17 03:46 PM)
_________________________
2009 Buick LaCrosse (3800 Series III) - 137,000 miles.
PZ Plat HM/Mobil 1 HM
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#4614014 - 12/25/17 03:59 PM Re: Safe to drive on unplugged coolant temp sensor? [Re: Hemispheres]
TmanP Online   content


Registered: 10/30/15
Posts: 436
Loc: MN
(I think) The fans running nonstop is a failsafe mode where if it doesn't know what the temp is, it assumes that it is too high; it's what I would expect to happen in that case. What's the car?
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#4614017 - 12/25/17 04:06 PM Re: Safe to drive on unplugged coolant temp sensor? [Re: Hemispheres]
Hemispheres Offline


Registered: 01/14/17
Posts: 381
Loc: Virginia
2009 LaCrosse 3800
_________________________
2009 Buick LaCrosse (3800 Series III) - 137,000 miles.
PZ Plat HM/Mobil 1 HM
Bosch/Purolator/Mobil filters

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#4614060 - 12/25/17 05:01 PM Re: Safe to drive on unplugged coolant temp sensor? [Re: Hemispheres]
Hemispheres Offline


Registered: 01/14/17
Posts: 381
Loc: Virginia
Well Iíve only gone about 35 miles and Iíve got gas in my oil. Wiped the dipstick 3 times on a paper towel and itís noticeable if you Inhale deeply
_________________________
2009 Buick LaCrosse (3800 Series III) - 137,000 miles.
PZ Plat HM/Mobil 1 HM
Bosch/Purolator/Mobil filters

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#4614079 - 12/25/17 05:25 PM Re: Safe to drive on unplugged coolant temp sensor? [Re: Hemispheres]
Hemispheres Offline


Registered: 01/14/17
Posts: 381
Loc: Virginia
Needless to say the Buick is grounded. Tomorrow it gets a new Coolant temp sensor, CRC 5 minute engine flush along with 5 qt synthetic and a new filter.
_________________________
2009 Buick LaCrosse (3800 Series III) - 137,000 miles.
PZ Plat HM/Mobil 1 HM
Bosch/Purolator/Mobil filters

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#4614085 - 12/25/17 05:42 PM Re: Safe to drive on unplugged coolant temp sensor? [Re: Hemispheres]
Hemispheres Offline


Registered: 01/14/17
Posts: 381
Loc: Virginia
Good news is the oil isnít flammable.... yet.
_________________________
2009 Buick LaCrosse (3800 Series III) - 137,000 miles.
PZ Plat HM/Mobil 1 HM
Bosch/Purolator/Mobil filters

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#4614109 - 12/25/17 06:24 PM Re: Safe to drive on unplugged coolant temp sensor? [Re: Hemispheres]
JimPghPA Offline


Registered: 08/22/09
Posts: 3859
Loc: Pittsburgh,PA U.S.A.
Running really rich washes the oil off of the cylinder wall and significantly increases engine wear. You could wear out an engine in one or two years if you do it all the time.
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#4614114 - 12/25/17 06:30 PM Re: Safe to drive on unplugged coolant temp sensor? [Re: JimPghPA]
Hemispheres Offline


Registered: 01/14/17
Posts: 381
Loc: Virginia
Exactly why itís all getting flushed n replaced tomorrow along with the new sensor. Iím more worried about bearing failure and trans damage due to the slam shifts.
_________________________
2009 Buick LaCrosse (3800 Series III) - 137,000 miles.
PZ Plat HM/Mobil 1 HM
Bosch/Purolator/Mobil filters

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#4614380 - 12/26/17 06:43 AM Re: Safe to drive on unplugged coolant temp sensor? [Re: Hemispheres]
kc8adu Offline


Registered: 08/02/05
Posts: 894
Loc: dayton oh
it will read -40 and run very rich.
hard on a lot of things esp the cat.
park it.

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