Oil Smells Like Gas
Greg Randolph
What causes my motor oil to smell like gas? The motor is a 4.3 L in a
S-10 Blazer with 120,000 miles. My guess is that the rings aren't as
tight as they used to be although it doesn't burn very much oil. Thanks.
Jim
May be running rich. Could have the oil tested (to verify fuel
dilution) or have the engine checked. Maybe an exhaust gas analyzer
will tell if it is running rich.
Jim in Md.
michael warren griffiths
On Sat, 2 May 1998, Greg Randolph wrote:
> What causes my motor oil to smell like gas? The motor is a 4.3 L in a
> S-10 Blazer with 120,000 miles. My guess is that the rings aren't as
> tight as they used to be although it doesn't burn very much oil. Thanks.
>
>
Your engine could be running too rich, which makes it easier for
gas to seep past the rings (if there's more gas in the combustion chamber,
more will get past the rings). Also check the PCV system. I think it is
supposed to ventilate stuff like that out of the oil.
AJDalton7
> Your engine could be running too rich, which makes it easier for
>gas to seep past the rings (if there's more gas in the combustion chamber,
>more will get past the rings). Also check the PCV system. I think it is
>supposed to ventilate stuff like that out of the oil.
Also check the air filter . A common cause of rich mixture.
GMperfrmce
>What causes my motor oil to smell like gas? The motor is a 4.3 L in a<BR>
>S-10 Blazer with 120,000 miles. My guess is that the rings aren't as<BR>
>tight as they used to be although it doesn't burn very much oil. Thanks
You didn't mention if it was fuel injected or not. If it is you could have a
leaky injector dumping fuel in after you shut it off. If it isn't you could
have a ruptured diaphragm in the fuel pump which is leaking into the oil.
Bill
Dever
If your 4.3 L has a mechanical fuel pump, the diaphram on the pump has
probably ruptured allowing raw fuel to mix with your oil. A good indication
of this would be an actual rise in your oil level, due to the presence of
the raw fuel. This is a very serious problem, if too much fuel mixes with
your oil it could has explosive effects. Loose rings probably would not
allow enough raw fuel to pass for you to be able to smell it in your oil.
Greg Randolph wrote in message <354B8E...@sprintmail.com>...
>What causes my motor oil to smell like gas? The motor is a 4.3 L in a
>S-10 Blazer with 120,000 miles. My guess is that the rings aren't as
>tight as they used to be although it doesn't burn very much oil. Thanks.
Nathan J Nagel
Excerpts from netnews.rec.autos.tech: 2-May-98 Re: Oil Smells Like Gas
by AJDa...@aol.com
Did Chevy ever make a carbed 4.3? (sorry, memory failing....) a bad
mechanical fuel pump can leak gas into the crankcase.
nate
Michael Pomeroy
I've wondered about this as well.
I have a 92 S10 Blazer with the 4.3 and one of the earlier
fuel-injected motors (not throttle-body). It now has over 125,000
miles, uses Mobil 1 synthetic, and the oil always smells like fuel
when it's changed.
I also get oil analysis done through a very reputable place - and it
NEVER shows any fuel dilution in the oil.
So, I also wonder what's going on here??
Mike
On Sat, 02 May 1998 17:27:39 -0700, Jim <jtjo...@ns.erols.com>
wrote:
>May be running rich. Could have the oil tested (to verify fuel
>dilution) or have the engine checked. Maybe an exhaust gas analyzer
>will tell if it is running rich.
>Jim in Md.
>
>
>
>Greg Randolph wrote:
>>
>> What causes my motor oil to smell like gas? The motor is a 4.3 L in a
>> S-10 Blazer with 120,000 miles. My guess is that the rings aren't as
>> tight as they used to be although it doesn't burn very much oil. Thanks.
>
Michael Pomeroy
pome...@tdo.infi.net
(Just remove the second m to send me email - blame the spammers.)
Steve Cass
>==========Greg Randolph, 5/2/98==========
>
>
>What causes my motor oil to smell like gas? The motor is a 4.3 L in a
>S-10 Blazer with 120,000 miles. My guess is that the rings aren't as
>tight as they used to be although it doesn't burn very much oil. Thanks.
Greg, I don't know a lot about GMs 4.3L but it might be possible
you have a bad fuel pump, leaking gas into the engine. Just a thought.
ASC
66 Dodge Charger 318 (Poly)
66 Dodge Charger 440
Saab85900
>Michael Pomeroy wrote:
> It now has over 125,000
>miles, uses Mobil 1 synthetic, and the oil always smells like fuel
>when it's changed. I also get oil analysis done through a very reputable
place - and it
>NEVER shows any fuel dilution in the oil.
Mike--then keep on running and don't sweat it. If there was fuel in there, the
lab would detect it in a flash.
Dick in Falls Church, VA
E. William Lawrence III
Greg,
You may need to investigate, does the truck seem to run ok?
If you have a very rich condition, i.e. a leaking injector or pressure
regulator, that could
cause unburned fuel to enter the crankcase.
It may be normal if the oil has been in for a very long time. In that case,
change it.
Check the oil level on a regular basis, if it seems to rise or gets stronger
with fuel odor
have it checked out.
Bill
Michael Pomeroy
Dick,
I agree; that's what I've been doing.
It is strange though, and I do understand why the original poster is
concerned. The odor from mine is strong and very consistent with fuel
in the oil. The oil analysis results were of a great surprise!
If I were the first poster, I'd want to do at least one good analysis
from a reputable lab as soon as possible to confirm or reject the
notion. If it is fuel, it really needs quick resolution.
One thing I have noticed, is that odor does not come until the oil has
some miles on it - maybe a thousand or so, and then becomes stronger
as the oil ages and the miles go on. (You can smell it on the
dipstick if you try.)
You're an expert - any idea what's happening?
Curious .....
Mike