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Author
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Topic: Leaded race gas harms O2 sensors?
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WIKD 281
CaliforniaFords.com
Owner
Member # 40
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posted
 
 
I have always been told that leaded race fuel leaves deposits on O2 sensors, is this true? Thanks for any help.
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Faster than most, slower than less.
Posts: 1941 | Registered: Jun 2000
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JohnB
Tech Moderator
Member # 969
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posted
quote:
Originally posted by WIKD 281:
I have always been told that leaded race fuel leaves deposits on O2 sensors, is this true? Thanks for any help.
Absolutely true. The deposits will cause hot spots on the sensor, causing them to weaken and overheat...boom, they will shatter. In the early 2000's I went through about 3 pairs of them...Autozone thought I was crazy returning them in that condition.
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1965 Shelby Cobra
1993 Cobra
2012 F150 Raptor
2020 GT500
Posts: 6523 | From: Orlando FL/Redding CA | Registered: Mar 2002
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WIKD 281
CaliforniaFords.com
Owner
Member # 40
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posted
Thanks for the reply Johnb. I don't want to take the risk of wearing out my O2's any faster so ill call tommorow to make sure the order is unleaded. Thanks!
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Faster than most, slower than less.
Posts: 1941 | Registered: Jun 2000
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wht2000gt
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Member # 10127
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posted
ERC in San Lorenzo has unleaded 110.
Posts: 547 | From: East Bay | Registered: Jul 2010
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WIKD 281
CaliforniaFords.com
Owner
Member # 40
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posted
quote:
Originally posted by wht2000gt:
ERC in San Lorenzo has unleaded 110.
Thanks for the heads up but the owner of ERC was the one telling me that the leaded fuel is a little cheaper and it will not harm the O2's. Im going to run the unleaded to be safe.
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Faster than most, slower than less.
Posts: 1941 | Registered: Jun 2000
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wht2000gt
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Member # 10127
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posted
That guys an idiot. Lol. I ruined 2 myself from running leaded.
Posts: 547 | From: East Bay | Registered: Jul 2010
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racsirx
CAFords OG
Member # 1710
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posted
I ran leaded gas on many different Mustangs and didnt have a problem, but I do know it does happen but I thought it took awhile for them to go bad.
[ January 27, 2011, 05:38 AM: Message edited by: racsirx ]
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88 Saleen #564
88 GT 331 NOVI2000
88 Coupe TURBO 9.75@142
95 Cobra R #75-SOLD
06 F250
13 BMW AH3
17 GT350 #5556
GOD'S NOT DEAD
Posts: 20750 | From: Concord & Pittsburg, CA | Registered: Aug 2002
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JohnB
Tech Moderator
Member # 969
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posted
quote:
Originally posted by racsirx:
I ran leaded gas on many different Mustangs and didnt have a problem.
You were very lucky...or ran a aftermarket heated sensor. 40-50 hrs run time, max...and they will fail.
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1965 Shelby Cobra
1993 Cobra
2012 F150 Raptor
2020 GT500
Posts: 6523 | From: Orlando FL/Redding CA | Registered: Mar 2002
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racsirx
CAFords OG
Member # 1710
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posted
I was running stock oxygen sensors, I have more than 50hrs of run time on my Coupe and only ran straight C16 only. I have a few friends with F.A.S.T. and their oxygen sensors havent given them problems with leaded gas.
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88 Saleen #564
88 GT 331 NOVI2000
88 Coupe TURBO 9.75@142
95 Cobra R #75-SOLD
06 F250
13 BMW AH3
17 GT350 #5556
GOD'S NOT DEAD
Posts: 20750 | From: Concord & Pittsburg, CA | Registered: Aug 2002
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93PONY
Mr. Valve Events
Member # 60
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posted
Some fuels are worse than others. 110 leaded seems to be the worst at fouling O2's. (20 minutes before fouling the new O2's in one customers car) We run C16, Q16, and Maximal without any real O2 issues, however we flush the systems with pump 91 after racing to clear those fuels out. The leaded fuel is only used for racing. Pump gas or unleaded race gas otherwise.
Sunoco 260GT (104 unleaded) is what we prefer to run in all our modular setups. Best fuel we've found for these motors.
Mixing unleaded and leaded at no more than a 50/50 mix also works well.... Depending on the fuel (some don't mix at all). Our fuel distributor will custom blend any fuel we want if we order a full 54gal barrel. (104 + 116 for example)
[ January 27, 2011, 06:09 AM: Message edited by: 93PONY ]
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www.advancedenginedevelopment.com
SCT dealer
Dynotuning
(916)715-7569
Posts: 4265 | From: Fair Oaks, CA | Registered: Nov 2000
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WIKD 281
CaliforniaFords.com
Owner
Member # 40
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posted
Right on guys. Thanks for all the help! Harold
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Faster than most, slower than less.
Posts: 1941 | Registered: Jun 2000
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racsirx
CAFords OG
Member # 1710
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posted
My buddy Herman has been running C16 since 1999 and hasnt changed his oxygen sensors yet.
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88 Saleen #564
88 GT 331 NOVI2000
88 Coupe TURBO 9.75@142
95 Cobra R #75-SOLD
06 F250
13 BMW AH3
17 GT350 #5556
GOD'S NOT DEAD
Posts: 20750 | From: Concord & Pittsburg, CA | Registered: Aug 2002
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BIGBALLFACTOR
¯
Member # 7277
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posted
quote:
Originally posted by racsirx:
My buddy Herman has been running C16 since 1999 and hasnt changed his oxygen sensors yet.
herman is a sav lee that why he can get away with doing that
Posts: 6908 | From: okc | Registered: Dec 2006
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SteveL
¯
Member # 1241
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posted
quote:
Originally posted by 93PONY:
Our fuel distributor will custom blend any fuel we want if we order a full 54gal barrel. (104 + 116 for example)
My bet is you are putting two different fuels in the car depending on how empty that barrel is. 260GT+ is heavier than the leaded fuels and over time, will separate and be at the bottom of the barrel. 260GT (100 octane) is even heavier and will separate faster.
Posts: 578 | From: San Jose, CA | Registered: May 2002
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