Question about 2000 Buick LeSabre

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2000 Buick LeSabre Limited. 6 cylinder. 32,000 mi. Engine shuddering under load. Computer code indicates random misfire. Lots of things can be replaced from coils to plugs to cables to injectors to vaccum lines. Where should I start, so as not to spend a fortune on parts?

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Start by testing. You can pull the plugs and see if one or all of them look bad. This can indicate which cylinder(s) are misfiring. Then I would start with checking for spark, using spark plug wire pliers pull each wire and see if it arcs, if it doesnt then that means that you have a bad coil. Then check your wires for any damage and then check them with an ohm meter. If all that checks out then I would do a fuel pressure check. And somewhere along the line do a good check for broken vacuum hoses and bad wires.

Posted on Nov 15, 2010

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How do i fix my Mercury Villager 2002 with random misfire?


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2 Answers

2005 Buick Las 4 door Code p0300


Not much.
Code 300 is for a random miss. The engine computer has detected more than one cylinder that is not producing power, but no one cylinder is constant.
Until you get a code like 301 or 303 its a guessing game. 301-306 would tell you which cylinder is being the problem.
The cause could be fuel or spark.

Aug 30, 2015 | Buick Cars & Trucks

1 Answer

Random misfire on 99 Buick LaSabre


random misfire can be due to bad sparkplug wires or a vacuum leak at the intake, there are many thing that can cause a random misfire even low fuel pressure, and last would be dirty injectors. i would start by having the fuel pressure checked and then having the injectors cleaned.

May 28, 2011 | 2000 Buick LeSabre

1 Answer

Code reads "random/multiple cylinder misfire


Basically this means that the the car's computer has detected that not all of the engine's cylinders are firing properly.

A P0300 diagnostic code indicates a random or multiple misfire. If the last digit is a number other than zero, it corresponds to the cylinder number that is misfiring. A P0302 code, for example, would tell you cylinder number two is misfiring. Unfortunately, a P0300 doesn't tell you specifically which cylinder(s) is/are mis-firing, nor why.

Symptoms may include:
the engine may be harder to start
the engine may stumble / stumble, and/or hesitate
other symptoms may also be present

Causes: A code P0300 may mean that one or more of the following has happened:
Faulty spark plugs or wires
Faulty coil (pack)
Faulty oxygen sensor(s)
Faulty fuel injector(s)
Burned exhaust valve
Faulty catalytic converter(s)
Stuck/blocked EGR valve / passages
Faulty camshaft position sensor
Defective computer

Possible Solutions:
If there are no symptoms, the simplest thing to do is to reset the code and see if it comes back.

If there are symptoms such as the engine is stumbling or hesitating, check all wiring and connectors that lead to the cylinders (i.e. spark plugs). Depending on how long the ignition components have been in the car, it may be a good idea to replace them as part of your regular maintenance schedule. I would suggest spark plugs, spark plug wires, distributor cap, and rotor (if applicable). Otherwise, check the coils (a.k.a. coil packs). In some cases, the catalytic converter has gone bad. If you smell rotten eggs in the exhaust, your cat converter needs to be replaced. I've also heard in other cases the problems were faulty fuel injectors.

Random misfires that jump around from one cylinder to another (read: P030x codes) also will set a P0300 code. The underlying cause is often a lean fuel condition, which may be due to a vacuum leak in the intake manifold or unmetered air getting past the airflow sensor, or an EGR valve that is stuck open.

Hope helps.

Apr 25, 2011 | 2000 Buick LeSabre

1 Answer

2000 Buick LeSabre Will not start Replaced cam


Multiple engine misfire is related to the coils and the ignition control module. I have a 2002 with the 3.8 engine. It has three coils. I just went through this problem. I bought one coil and tried it in each position with no improvement. It was the ignition control module. Mine is located under the three coils. A relatively easy item to replace. Cost about $140.

Apr 18, 2010 | 2000 Buick LeSabre

1 Answer

1991 Buick LeSabre 3.8L misfire


Plug wires! If it miss fires under a load it's usually an ignition problem. Check the plugs and replace if necessary and replace the plug wires.

Feb 06, 2010 | 1991 Buick LeSabre

1 Answer

1997 Buick Lesabre Limited Spark or Fuel Problem?


Hi:

Multiple cylinder misfire means that more than one spark plug didn't fire, and that rules out a single spark plug fail.

You are more likely looking at an ignition module, or a coil.

Nov 24, 2009 | 1997 Buick LeSabre

2 Answers

I have a 2000 buick lasabre that has been running very rough, my son put computer on and it said bad o2 sensor, he replaced sensor, and it is still running rough, but the computer now says cylinder 6...


plugs and or wires.
for some reason the spark is jumping out of the wire or plug.
the plug insulater may have a crack in it.
also use a carb spray to clean out the throttle body at the throttle plate.
all the black carbon will build up around the throttle plate and restrick airflow at an idle position.

hope this helps
thank you
jm

Aug 26, 2009 | 2000 Buick LeSabre

7 Answers

Random Cylinder Misfire


The problem is the ignition control module such is under the coil packs. It seems to be an internal problem in the design. I have seen it many times and if you don't belive as many will not. So disconnect the modules electrical connector and just let it sit for two to three days. After that clean ir replace your sparkplugs, they will be fails up dew to it running lean and rich. Plug it in. Plug it in and wala its fixed $ but only for a week or two then back to the same thing so in short change the ignition module and save time and money, and don't forget to thank your friendly neighbor hood mexican mechanic.

Jul 09, 2008 | 2000 Buick LeSabre

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