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Discussion Starter #1
This morning i got this on my 2001 deville it was cold outside about 15 deg. And fuel tank was almost empty.. could i be getting this due to water in my lines? Or is this a larger issue?
 

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Super Moderator
2003 Deville Base
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5,126 Posts
Re: p0300

anytime you post codes, always post the definitions. See sticky at top of this page about pulling codes and finding definitions. There are hundreds of codes.
 

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73 ELDORADO CONVERTIBLE, 2001 DEVILLE LIMUSINE
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3 Posts
Re: p0300

Hello,

I have attached the FSM procedure for that code, hope it helps. Just in case you might need more information do not hesitate to ask me
 

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96 Concours, 05 DHS
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186 Posts
Re: p0300

I think you need an OBDII scan tool to obtain the specific cylinder misfire code (p030x) for the 2000-2005 model years. Some car parts stores will scan for free.

In my very limited experience (three instances), it has come down to a bad ignition coil or a carbon track on the plug.
 

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Master of the Dark Art of Diagnostics
2003 DHS - two-2002 DHS, 2003 SLS, 1995 Sedan DeVille, 1989 Coupe DeVille
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19,824 Posts
Re: p0300

Random missfire
===============================
P0300 is a generic misfire code -
our on-board code readers will not display WHICH cylinder/cylinders is/are misfiring -
only that there IS a misfire -

take the car to any large auto parts store - they will check your codes for free -

P0301 is a misfire in cylinder #1 - P0302 is cylinder #2 - P0303 is #3 - etc -

once you discover WHICH cylinder is misfiring - diagnosis becomes much easier -

--------------------------
how many miles on the car -
how long ago was the last tune-up -
when was the TB - Throttle Body - last cleaned -
 

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Administrator
2002.5 F55 CORSA STS, 2014 Explorer XLT FWD
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69,778 Posts
Re: p0300

............. and these cars do not like running or sitting with empty fuel tanks. That is one of the WORST things you can do to a car, especially in fall/winter/spring with condensation and temperature swings.
 

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1992 Fleetwood S&S Hearse, 1993 Buick Roadmaster
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567 Posts
Re: p0300

I didn't read every word of the DTC info, but seeing as it states that contaminated fuel or a blocked fuel filter/fuel pressure condition could be causing the problem, I'd fill up with some good gas from a reputable company (think Shell or BP, not Murphy USA or your local bargain gas) and perhaps your favorite fuel treatment product - Seafoam, Heet, anything that will help eat up corrosion and neutralize water. Drive it for a couple days and see if the code goes away.

Also, just a note to everybody, I check these engine codes all day long at one of the big auto part chain stores - I'm peon management at one of them. Basically, I'm kind of like a grunt with a key that gets held responsible for things he didn't even know happened. My bad career choices aside, before you buy parts to fix almost any code, make sure your gas cap it sealing properly, and make sure you're running decent gas. Don't buy the cheap stuff, no matter how bad you want to! I'm no mechanic and I admit what I don't know, but there are a few things I do know - you're gonna get bad gas every once in a while, no matter where you buy it. If you do get some you think is bad, try a fuel treatment - they're cheap, and that's why they exist: for treating bad gas. In a world of perfect gas, you'd NEVER need one. As it is, Seafoam or your preferred brand is your friend!
 

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Master of the Dark Art of Diagnostics
2003 DHS - two-2002 DHS, 2003 SLS, 1995 Sedan DeVille, 1989 Coupe DeVille
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19,824 Posts
Re: p0300

I didn't read every word of the DTC info, but seeing as it states that contaminated fuel or a blocked fuel filter/fuel pressure condition could be causing the problem, I'd fill up with some good gas from a reputable company (think Shell or BP, not Murphy USA or your local bargain gas) and perhaps your favorite fuel treatment product - Seafoam, Heet, anything that will help eat up corrosion and neutralize water. Drive it for a couple days and see if the code goes away.

Also, just a note to everybody, I check these engine codes all day long at one of the big auto part chain stores - I'm peon management at one of them. Basically, I'm kind of like a grunt with a key that gets held responsible for things he didn't even know happened. My bad career choices aside, before you buy parts to fix almost any code, make sure your gas cap it sealing properly, and make sure you're running decent gas. Don't buy the cheap stuff, no matter how bad you want to! I'm no mechanic and I admit what I don't know, but there are a few things I do know - you're gonna get bad gas every once in a while, no matter where you buy it. If you do get some you think is bad, try a fuel treatment - they're cheap, and that's why they exist: for treating bad gas. In a world of perfect gas, you'd NEVER need one. As it is, Seafoam or your preferred brand is your friend!
=========================
you are new -
so I will save you from reading THOUSANDS of posts
on GAS WARS - and SNAKE OIL -

addressing some of your comments -
good gas - bad gas - cheap gas -

good gas from a reputable company

think Shell or BP,
not Murphy
USA
or your local bargain gas

ALL local gas comes from the same FUEL FARM -

what makes shell - or bp - or murphy brand gas -
is the unique blend of additives added to the bulk gas -
as the tanker truck is being filled -

and perhaps your favorite fuel treatment product -
Seafoam,
Heet,
anything that will help eat up corrosion
I can't imagine ANY fuel additive
that can EAT UP CORROSION -

and neutralize water.
almost ALL gas sold in the US is a blend of up to 10% alcohol -
alcohol readily mixes with - and neutralize water -
and that alcohol/water blend readily mixes with gas -

"HEAT" is nothing but alcohol -
same stuff that's already in the gas -
no reason to buy/add any more -

make sure you're running decent gas.
Don't buy the cheap stuff, no matter how bad you want to!

as I said above -
ALL BASE GAS IS THE SAME -

I admit what I don't know,
that's a good thing - add gasoline to that list -

but there are a few things I do know -

try a fuel treatment -
they're cheap,
actually - all that stuff is VERY EXPENSIVE -
$5 to $10 per PINT -

and that's why they exist:
no - snake oil RARELY "fixes" - or even helps anything -
they EXIST so someone can make $$$$$$$$$$$$$$


As it is, Seafoam or your preferred brand is your friend!
there is only ONE fuel treatment recommended by GM -
TECHRON -

----------------
 

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Administrator
2002.5 F55 CORSA STS, 2014 Explorer XLT FWD
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69,778 Posts
Re: p0300

As it is, Seafoam or your preferred brand is your friend!
I work behind the parts counter at a local Western Auto, part time. While I would NEVER run Seafoam in a blown up Briggs & Stratton lawnmower we try to sell tons of the stuff to the local ricer drivers. (Google "spiff")

Gasoline myths abound, and "bad gas" from a high volume spot-market dealer is one of them. Google "chevron techron" and "top tier gasoline" to do some study on fuels and additives.
 

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Super Moderator
White Diamond '03 DHS (with DTS floor shift)
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87,173 Posts
Could not agree more with Bass. You don't know what you don't know.
 

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1992 Fleetwood S&S Hearse, 1993 Buick Roadmaster
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567 Posts
"Snake oil" is an opinion, which you state in a manner I would best describe as "combative," possibly as "rude," definitely as "know it all." Of course, you have the right to an opinion. I've googled, read, watched videos, talked to customers, mechanics, and I feel very strongly about the opinion I stated. You obviously feel very strongly about yours.

"I'll save you from reading the THOUSANDS of posts....." Trust me, I've read enough of them, though not necessarily on this site. And opinions vary. Dad used to say "opinions are like butt holes - everybody's got one, and the usually stink." Obviously, there are countless millions of people who agree with both of us, so I suggest we give it a rest before this becomes a flame war, but since you decided to "correct" me with "the facts," I just wanted to let you remember that there are millions who think you're the one who is wrong.
 

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Master of the Dark Art of Diagnostics
2003 DHS - two-2002 DHS, 2003 SLS, 1995 Sedan DeVille, 1989 Coupe DeVille
Joined
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19,824 Posts
"Snake oil" is an opinion, which you state in a manner I would best describe as "combative," possibly as "rude," definitely as "know it all." Of course, you have the right to an opinion. I've googled, read, watched videos, talked to customers, mechanics, and I feel very strongly about the opinion I stated. You obviously feel very strongly about yours.

"I'll save you from reading the THOUSANDS of posts....." Trust me, I've read enough of them, though not necessarily on this site. And opinions vary. Dad used to say "opinions are like butt holes - everybody's got one, and the usually stink." Obviously, there are countless millions of people who agree with both of us, so I suggest we give it a rest before this becomes a flame war, but since you decided to "correct" me with "the facts," I just wanted to let you remember that there are millions who think you're the one who is wrong.
=============================
"Snake oil" is an opinion,
true - but an opinion formed based on FACTS

which you state in a manner
I would best describe as "combative," possibly as "rude,"

:histeric::histeric::histeric:stick around -
it will get better - :thumbsup:
I promise - :stirpot:

but since you decided to "correct" me with "the facts,"
I just wanted to let you remember
that there are millions who think you're the one who is wrong.

sure - and we all remember the legendary words from PT Barnum -
there is a sucker born every minute -

------------------

I have one more word of advice to share with you -
RESEARCH -
do it - it's amazing what you can learn -

-------------------------
look -
as a "peon manager" in an auto parts store -
we all understand -
your DUTY is to sell - sell - sell all the snake oil you possibly can -
it's all about the PROFITS -

just keep in mind that some/most of us on this site
have more knowledge and experience than the average guy off the street -

come here and make unsubstantiated statements and/or claims -
EXPECT to be challenged -
 

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Super Moderator
2003 Deville Base
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5,126 Posts
ratmonster, grow a thicker skin and stick around. Ranger, Bass and Sub aren't trying to be combative; they're just very direct, and if you'll check their profiles, they have been here way longer than your 4 days and have mountains of experience that can help you. They've certainly helped me. Know-it-alls? Well, you know the saying: it ain't bragging if you can do it. Here is another aspect to consider--some of these guys already know these cars & engines inside out, backwards & forwards--they rarely need outside help. So why are they here? They have no reason to be here other than to try to help owners like you and me. Maybe showing some respect would help you more so than talking about flame wars.
 

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1992 Fleetwood S&S Hearse, 1993 Buick Roadmaster
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567 Posts
I also have more knowledge than the average guy off the street. I have training, certification, real-world experience, the ability, will, and desire to read, research, learn, etc. I have done those things and I still disagree with you wholeheartedly. I deal with the public all day, and I haven't murdered anyone yet, so I'd say my skin is thick enough to repel acid, but just thin enough to still feel. My opinions are also based on facts. The claims I make ARE substantiated by mountains of evidence, just like your DENIAL of my claims is substantiated by mountains of evidence. At the end of the day, you just gotta decide which one you believe. No disrespect intended, just letting you know that I'm not new to this world, not new to cars, parts, diagnostics, or forums, and who ever wants to fight me on an issue is welcome to do so, but expect to be called on your inadequacies. So we can do this all day long, but I've got a pretty rewarding life (outside of my unfortunate career choices), so I'm gonna go do something else now.

Oh, to Mr Rchneider, who started this thread - sorry it devolved into something unrelated to your original post. I've been on web forums for different vehicle types or customization worlds for a very long time now, and I can assure you (if you aren't already aware) that this happens all the time. There are people like myself and Ranger and Submariner and Basscatt who all think they're right, either because we pulled facts, perceived facts, or opinions out of our individual posteriors, or because we received a vision from our deity of choice, or whatever. What happens in the end, though, is that your original question gets lost in a tennis match of words being volleyed, ironically, for your benefit.

At the end of the day, you have decide who you think has a good answer. I'll save you the time of trying to figure it out on your own - it's me. But all that aside, I hope you get your trouble straightened out, and thanks for allowing us to have a hoot in your thread!
 

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Administrator
2002.5 F55 CORSA STS, 2014 Explorer XLT FWD
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69,778 Posts
Carry on ................:food-snacking:
 

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Master of the Dark Art of Diagnostics
2003 DHS - two-2002 DHS, 2003 SLS, 1995 Sedan DeVille, 1989 Coupe DeVille
Joined
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19,824 Posts
I also have more knowledge than the average guy off the street. I have training, certification, real-world experience, the ability, will, and desire to read, research, learn, etc. I have done those things and I still disagree with you wholeheartedly. I deal with the public all day, and I haven't murdered anyone yet, so I'd say my skin is thick enough to repel acid, but just thin enough to still feel. My opinions are also based on facts. The claims I make ARE substantiated by mountains of evidence, just like your DENIAL of my claims is substantiated by mountains of evidence. At the end of the day, you just gotta decide which one you believe. No disrespect intended, just letting you know that I'm not new to this world, not new to cars, parts, diagnostics, or forums, and who ever wants to fight me on an issue is welcome to do so, but expect to be called on your inadequacies. So we can do this all day long, but I've got a pretty rewarding life (outside of my unfortunate career choices), so I'm gonna go do something else now.

Oh, to Mr Rchneider, who started this thread - sorry it devolved into something unrelated to your original post. I've been on web forums for different vehicle types or customization worlds for a very long time now, and I can assure you (if you aren't already aware) that this happens all the time. There are people like myself and Ranger and Submariner and Basscatt who all think they're right, either because we pulled facts, perceived facts, or opinions out of our individual posteriors, or because we received a vision from our deity of choice, or whatever. What happens in the end, though, is that your original question gets lost in a tennis match of words being volleyed, ironically, for your benefit.

At the end of the day, you have decide who you think has a good answer. I'll save you the time of trying to figure it out on your own - it's me. But all that aside, I hope you get your trouble straightened out, and thanks for allowing us to have a hoot in your thread!
===============================
so I'm gonna go do something else now. :helpless::wave::wavehi:
 
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