Question about 1995 Buick Century

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I have a 1996 buick century 3.1L. misfire # 1 cylinder

Here's the fun part.i know why its having the misfire i just don't know why
it's doing it. before i found out what was causing the misfire on my #1
cylinder.i did the first step changing the plugs and wires no luck so i
went and got a new fuel injector.. so i start the process of taking all the
**** apart to get the injectors {by the way its my first time doing this lol}
i did it slow and took my time. so i go to pull the fuel rail out and all but one injector came out which was the #1 i put down the fuel rail.which had only 5 not all 6. so i pull it out .on top of the injector it had this white powder like substance and inside the two little holes i tap the injector on my car more of it was coming out.then i looked at the fuel rail where the #1 injector go's to and it was jammed pack with this white i clean it out it took over an hour .pain in the a$$ but i got done
and put everything back together with new injector .start it up and know
problems know misfire nothing .then 2 weeks later my engine light came back on #1 misfire again what do i have to do get a new gas tank
or something. thank you for reading

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Add some additive and take apart and clean again. change the fuel filter also cause it sounds like theres something clogging somewhere and it will take some trys to get it all out

Posted on Dec 22, 2008


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Lean misfire on cylinder 1, checked for air fuel and spark, still found nothing wrong.

Hi Austin:
Just for fun, I'd do a compression check on #1.
If it is low, at low RPM it would explain the misfire.
At higher RPM the compression happens faster so the source of the does not have as much time to allow pressure drop, so the mis-fire disappears like magic.
Reply as a COMMENT to this post to let me know what you find.

Feb 02, 2016 | 1991 Honda Accord

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Why does my 1998 Buick Century cutting out or skipping when driving and makes the engine light flash

Misfiring. Have the codes read. Code number p0301 is number 1 cylinder. p0304 would be number 4 cylinder and so on.

Jan 14, 2015 | 1998 Buick Century

1 Answer

I have 1999 grand jeep cheroke v6 with 180,000

USA CAR? why not say that.?
a tune up is 1st not last. for 100 years.
skipping that 60k service or 100k, is the cause.
you have misfire. hot and cold
id have to do 3 to 10 tests to find it. but that be after a tuneup.
why delay doing that. so odd......
you can not burn fuel right with no or weak spark, so.....

this is called misfire, (hot and cold, no hot actual temp stated)
our USA cars have OBD2, PCM.
so why not connect a scan tool to the OBD2 16pin port, and scan it.
see all those errors, BINGO !!!!!
that be 2nd after a real tuneup.

p0300s are random misfire.
and P0301 is cylinder 1 misfiring.... like that...see?
me knowing the DTC errors, makes troubleshooting impossible.

here are some rand come causes of all misfiring.
  • bad compression 1 or more cylinders, (not at spec, psi)
  • Bad spark 1 or more (tuneup time full )
  • Bad fueling. (too weak or too much 1 or more cyl.)
  • injectors leaking. 1 or more...
  • injectors clogged in whole or part. 1 or more...
  • intake air leaks , cause lean misfire.
  • water thermostat stuck open, and never reaches 180F min.
  • ECT lies, and water is 180f but reads say 140 on scan tool.
  • lots of other thinks, all seen on scan tool, sensors inputs.....
end guessing list. the first has 50 causes. bad engine.
so guessing is futile.
we do simple tests, with simple tools and let the EVIDENCE speak.

do you want us to guess, or show the tests, and the order.
you call,
we can not guess what you are asking unless you say so.
here is one example
hello my car misfires. EFI engine.,
i have nyo tools , and no books and do not want to buy any.
nor learn.
what is wrong.? with my engine.?
answer, get it serviced, or do the tuneup and pray.
listing the 50 causes, is futile.

Sep 24, 2014 | 1999 Jeep Grand Cherokee

1 Answer

2001 buick century P0304 step on gas engine light starts flashing

P0304 is engine misfire #4 cylinder Several things can cause a misfire #1 electrical which you have covered #2 Mechanical Test engine compression is should be around 150 cranking and 120 running . internal valve train components can cause bad compression and the valves then self. #3 fuel injector can be the cause suggest swapping with a know good cylinder and see if misfire follows injector.

Aug 19, 2014 | 2001 Buick Century

1 Answer

1996 buick century misfire

My 96 century with a 3.1 v-6 gave me fits for years shooting a 171 code(running too lean) I wound up changing the fuel filter and the problem went away. If it's been a while since the filter was changed, try it.

Jul 03, 2014 | 1995 Buick Century

1 Answer

Engine running lean

The misfire causes the lean condition.So you have tyo fix the misfire. don-ohio

Mar 28, 2013 | 2000 Ford Focus

1 Answer

My hondacivic 1.6 vtec is misfiring when taking off then it smooths out a bit when sitting still wont rev past 4 rpm

You have a misfire, so you don't need someone to
tell you to diagnose what you already know you have

It won't rev past 4,000 rpm, because it is programmed that way,
just so you don't & ruin the engine

If you want to play--- get a car from the 1960's & have some fun

Oct 08, 2012 | 1992 Pontiac Bonneville

1 Answer

1992 crown vic lx smokes and skiips repalced the temp sensor to the computer did a compeson check all 155 to 160 smells like its flooding im stumped did have some water in my fuel so may drop the tank and...

Hi John, It would help to know more details? The color of the smoke gives a clue as to what is wrong with an engine. If the smoke is dark almost black grey it usually refers to a very rich fuel mixture, meaning that your diagnostics of flooding could be correct. If the smoke is a lighter greyish blue it usually means that the engine is burning oil. The first will mean finding out if an injector is leaking and once found replacing it. Also look for any damaged seals on both ends of all the injectors. I don't understand why you replaced the temperature sensor? Have you had a problem with the cooling system? Water in the fuel line can cause havoc and cause a misfire if it is not cleaned out. Vehicles don't run too well on water so I suggest that be the place to start your work. If there is water in the fuel system it will sometimes cause a light grey steamy smoke and definitely a misfire. Regards John

Sep 22, 2012 | Cars & Trucks

1 Answer

Hi I have a 2004 Ford Explorer 6 cylinder 4.0 engine. I have cylinder 2 4 and 5 misfiring. I put new spark plugs, new spark plug wires and a new coil pack. All injectors have a pulse and spray fuel. I also...

Hello, It seems you have done a lot in trying to fix this. My first idea is that it is a pickup sensor for the camshaft or crankshaft. The firing order of your engine is 1 4 2 5 3 6. You are having misfires in 3 consecutive cylinders 4,2,5. This would seem to mean that the distance to trigger the firing is greater on 4,2,and 5 than on the other 3 cylinders. This can mean you have a lopsided situation on either the crank pulley or cam. You should see if the crank pulley is tight as well as the cam or if you can better adjust the 2 sensors.

Next, the Intake system can have a bad gasket. Use a water spray bottle and with the engine running, put a mist on the Intake gasket. If you have a change in RPM, then you have found a leak. This would explain why the same 3 cylinders are always misfiring. Some of the V-6 models used sandwiched 2 piece manifolds and the gasket between the upper and lower half would deteriorate over time. Some engines used "runners" between the Intake manifold and heads which could gum up over time. Just a cleaning operation if you are putting on a new Intake gasket anyway.

I hope my solution is very helpful and would like to know what you finally found as the problem.

Aug 03, 2011 | 2004 Ford Explorer

1 Answer

I got a code that shows Fuel system lean bank 1 (Cylinder number 1 denotes bank 1) Probable causes are: 1 Low fuel pressure 2. blocked injectors 3. large vacuum leak 4. Maf sensor fault, what are...

You obviously do not know or care about your truck,
as far as OBD2 dash lights being on

When ever you get any diagnostic trouble fault codes
& thus the dash lights,your vehicle has problems

These lights have been on all vehicles for 31 years
Plenty of time to educate yourself

You get the code now & have somehow found out
possible causes,as you would if you went to a trouble chart

So you off to a good start,just a year late

I wouldn't even worry about the injectors,the gas filter is
taking care of them

You could put a pressure gauge on the system, to check
fuel pressure. Should do that every couple years anyway

Your O2 Sensors, the one or two closest to the engine,not the
rear monitors,get replaced every 100,000 miles

The MAF Sensor gets cleaned at least once a year

With a Lean Condition on only one Bank I would look for vacuum leaks
You may have to have the intake manifold smoke tested & check all
vacuum hoses & sources.

Don't rule out a misfire on cyl#1

As far as resolving anything,you didn't say if you have the
ability to do some of your own work
You obviously don't take it to a repair shop,at least not in a year !!

Jul 17, 2011 | 2002 Nissan Pathfinder

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