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Old 02-26-2013, 05:29 PM   #1
sdowney717
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Default Clean O2 sensors with muriatic acid?

Curious if dipping them in acid would clear off any interfering coating.

I ran some old boat gas in the Roadmaster 94 wagon. Engine sputtered to a stop. Fuel filter was blocked. New filter and disconnected the lines at the intake manifold and flushed the lines using the fuel pump. Engine is again running smooth, however the check engine light came on and stays on. So will check the code. Wonder if it could be the O2 sensor?

This gas was about 8 yrs old and I guess gummy. Put in 2 gallons out of 10. At least the filter caught it and did not clog the injectors. The gas likely had dissolved metals and other invisible crud. Otherwise it looked ok. anyway that is the last of 80 gallons. I eventually managed to use it up in the boat. Boat has carbs and I loop filtered over and over and diluted 50-50 with new gas. Took about a year of boating to finally use it all.

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Old 02-26-2013, 06:19 PM   #2
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Default Re: Clean O2 sensors with muriatic acid?

The only way to clean an O2 sensor is to remove it and roast it in a torch flame while monitoring the output and alternative heating and cooling the tip and when it changes state in less than 60 seconds it is clean again.

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Old 02-26-2013, 06:59 PM   #3
sdowney717
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Default Re: Clean O2 sensors with muriatic acid?

Thanks for the torch idea.

How does lead or metals contaminate the sensor? So then I was thinking disolve it off with acid.

The boat tanks are monel metal and likely copper and nickle are in the gas.
The gas should not have any lead since that was phased out long ago.

What else coats or ruins these sensors?
If it turns out 02 sensor code thrown, I will likely try various things.

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Old 02-26-2013, 08:07 PM   #4
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Default Re: Clean O2 sensors with muriatic acid?

Just replace the sensor, Denso or NGK/NTK will work and RockAuto sells them.

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Old 02-27-2013, 10:45 AM   #5
sdowney717
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Default Re: Clean O2 sensors with muriatic acid?

Do you know where the coolant temp sensor is on the GM LT1 engine?
I got a code 15.
You can read the codes directly in the climate control panel
http://www.buickforums.com/forums/sh...ad.php?t=10691

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Old 02-27-2013, 11:02 AM   #6
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Default Re: Clean O2 sensors with muriatic acid?

No, but google does.

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Old 02-27-2013, 02:02 PM   #7
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Default Re: Clean O2 sensors with muriatic acid?

The temp sensor is bad, reads 128,000 ohms, so it tells the ECU the temp is less than -40 degrees.!

It is located under the air intake hoses to driver side of water pump.
Function is a standard thermistor which changes ohms with temperature change.
http://www.gmtuners.com/tech/CTS_ICM.htm

Going to get one from AZ.

One odd symptom is car wont start unless floored, which others noted on some forum. And the car has a temp gauge which works like it always did. Different sensor?

Maybe the bad gas and sensor hit all same time. The old fuel filter when blow thru using mouth has a lot of resistance compared to the new filer.

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Old 02-27-2013, 02:19 PM   #8
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Default Re: Clean O2 sensors with muriatic acid?

The water/alcohol mix blocks fuel filters solid.

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Old 02-27-2013, 04:19 PM   #9
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Default Re: Clean O2 sensors with muriatic acid?

Are we talking about a Buick here?

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Replacement blend door actuator gears available! $20 shipped, PM for details.

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Old 02-27-2013, 06:29 PM   #10
sdowney717
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Default Re: Clean O2 sensors with muriatic acid?

Yes, and the new coolant sensor fixed the problem. Runs good again.
I check fuel pressure and it is 46psi, normal range is 41 to 47.

here is a very good info diagnostic page, I will post in case someone googles into this thread.

http://www.justanswer.com/buick/712v...-corvette.html

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Old 02-28-2013, 12:21 AM   #11
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Default Re: Clean O2 sensors with muriatic acid?

Well, glad you got it resolved.

Saturnfans is a strange place to post Buick questions, but whatever.

...
Replacement blend door actuator gears available! $20 shipped, PM for details.

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