Question about Saturn SL1

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Random Cylinder Misfire

I have a 2000 Buick LaSabre that suddenly started not running well.  The Service Engine Soon light often starts blinking, and stays steadily on at other times.  I went to AutoZone and they read the trouble codes that say that the system is detecting "random cylinder misfires".
The thing is that just a month or two ago I was having similar engine trouble, though the diagnostic then was stating that a specific cylinder was misfiring.  I changed all the spark-plugs, since my mileage is over 100,000.  However all the old plugs looked really good.  Unfortunately, the problem persisted, so I changed the wires.  Then the problem was solved.  (I did find that the coil connector side of the wire for the diagnosed misfiring cylinder was charred.  So I'm sure that was the real problem.  Though I have concern over what damage may have been inflicted upon the coil and/or the Ignition Control Module.)
So I know that my spark-plugs are new, and so are my wires.  What would help me in further diagnosing this issue would be to know how the system determines misfires, and whether it would report a "random" cylinder misfire if a pair of cylinders were misfiring---specifically if the pair of cylinders driven by a single coil (of the three on this vehicle) were misfiring?
Does the system determine such misfires through a detection of the ignition impulse sent to the spark-plug (back EMF, current, etc.), or does it have some ignition sensor within the cylinder (detecting light, heat, sound, whatever)?  The answer to this question will help direct my diagnosis.
If the system does not have the ability to identify a pair of misfiring cylinders, but will provide the "random" misfire code even for a pair of misfiring cylinders driven by the same ignition coil, then I could rightly suspect a coil.  Otherwise, I don't suspect a coil since this would require multiple coils to be acting up.  (Not impossible, but not so likely.)
The thing is that the sound of the engine doesn't suggest "random" misfires.  It sounds quite regular, even though the gas mileage I'm getting suggests I'm running on only four of my six cylinders.
Please help.
Thanks.
David 1999 Saturn SL1
Code P0300 Random Cylinder Misfires, also shows a code related to cam position sensor.
Car was running very smoothly, then parked it for 1-2 months. Upon startup it ran VERY rough. Changed plugs, no improvement. Plan to change ignition wires.
Any other suggestions??
TKS
Bob

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  • Anonymous Apr 17, 2009

    what would cause s 1998 jeep grand cherokee to pop and crack threw the carb and have no power when in drive but runs good when idleing

  • Anonymous Mar 13, 2014

    diagnosed as coil pack on a 6 cylinder when we pulled the plugs number one was oil soaked on the spark plug

  • Anonymous Mar 23, 2014

    Misfiring on cylinders 2 4 6

  • Anonymous Mar 23, 2014

    Vehicle shuts off traction control and shows to service stab-ability track and when hooked to a computer to find out the codes show miss firing on cylinders 2 4 6

  • Anonymous Mar 23, 2014

    I have a 2007 Saturn outlook XR all wheel drive and it starts running rough the traction control shuts off automatically and show to service the traction control and stability track and just here a day or so when you try to start it after this it's like the starter is staying engaged when hocked up on a computer to find out what the problem is it shows miss firing on cylinders 2 4 6

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The cam sensor code is the part to concentrate on, also check the timing belt for excess play causing the camshaft to whip, this will cause a random miss.

Posted on Oct 30, 2008

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Get a Haynes manual for your vehicle and use the troubleshooting guide there.  about $20 from amazon, auto parts store or haynes.com.  This WILL save you time and shortcut this and any future diagnosis. Haynes IMHO are top notch and I like them better than some factory service manuals that fgo for $100 and more.

David, 99 Saturn,  Cam position sensor codes seem to indicate a engine timing (not spark, but crankshaft/camshaft sync).  Old timing belts or worn tensioners can cause belts to jump a tooth or two which can have a pretty dramatic effect.  The belt could also be old/dryrot and have lost a tooth or two causing it to jump.  If any of these are the case, or if the timing belt interval is near,  replace timing belt, tensioner, idler roller if present and water pump.  FYI, quality OEM ignition wires shold last at least 10 years.  If they are really bad, you can open the engine compartment on a dark night and you will see sparks arcing between them and/or something metal nearby.  We all replace wires when we are not sure what the problem is, and regardless of what anyone tells you, it only rarely solves anything unless the car is more than 10 years old. 

good luck.

Posted on Oct 30, 2008

3 Suggested Answers

SOURCE: Random Cylinder Misfire

Im having the same problem with a 96 buick century. I wondering if its the coil packs. The plugs and wires have 8000miles of use. So i think it shouldnt be them. But same symptoms, engine code P0300.

Posted on Aug 12, 2008

  • 1 Answer

SOURCE: 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.

Posted on Sep 10, 2011

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Posted on Jan 02, 2017

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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.

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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.

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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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