Question about 2000 Buick LeSabre

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How do i check the coil packs for a 2000 buick 3800

I have changed the plugs and wires but i still have a bad miss the trouble code is po300

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Posted on Jan 02, 2017

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SOURCE: engine misses at 35 mph code po 304 coil pack plug wire replaced

Information courtesy of

A code P0304 may mean that one or more of the following has happened:

  • Faulty spark plug or wire
  • Faulty coil (pack)
  • Faulty oxygen sensor (s)
  • Faulty fuel injector
  • Burned exhaust valve
  • Faulty catalytic converter(s)
  • Running out of fuel
  • Poor compression
  • 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.

Hope this helps with your problem. Best of luck.

Posted on May 21, 2009

  • 275 Answers

SOURCE: Buick Lesabre 1998, How you check the coil packs?

you can take them off and have them tested or you can pull the plugs and there should be two plugs that will be really black follow those wires back to the coil that is bad. or you could also have someone crank it while you stick a screwdriver in the end of the wire on the plug and hold the screwdriver next to the engine or a good ground and there should be a bright blue spark but be careful and dont touch the car or it might tickle a little bit

Posted on Nov 12, 2008

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SOURCE: Car Misses after replacing the coils and spark plugs

Has the service engine light come on? If so, have the codes pulled and it will narrow down the cylinder that is causing the problem.
If no service engine light, have you narrowed it down to one cylinder or is it random.
Let me know and we will go from there.

Posted on Mar 27, 2009

  • 176 Answers

SOURCE: I have 2000 Buick Regal GS. Check engine light

the code should be read with a scanner, when check engine blinks, not a good sign

Posted on Jun 30, 2009

  • 267 Answers

SOURCE: I have an 2002 buick century that has a iginition

double check plug wires to be sure they go to the right cylinders. After that i would check fuel injectors
You need a listening device and listen for metallic clicking sound. Bad injectors will be silent and they do cause the same miss

Posted on Apr 21, 2010

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2 Answers

How do i fix code PO300 on my 2000 Nissan Altima

That's a multiple / random misfire. Lot's of ways to go on this.. bad plug, wire, coil pack, etc. Then there's this one:
fixed my PO300 code MY350Z COM Forums

May 23, 2014 | 2000 Nissan Altima

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Piston missing code 0300 comes up 2000 tundra on 90,000 miles

po300 code is a random cylinder misfire. start with checking the plugs, plug wires, coil packs, make sure no plug wires are touching exhaust manifold. If it is none of these you might want to take it to a mechanics shop or dealer. might be something internal like leaking valve/s, start with the simplest things hopefully you can find problem.

Jan 14, 2011 | Toyota Tundra Cars & Trucks

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Misfire code po300 comes up how do i fix this problem and keep light off the car runs but misfires and runs crappy

a po300 is a random cylinder misfire would start out with pulgs and wires first then if that does not fix it try these
  • Faulty coil (pack)
  • Faulty oxygen sensor(s)
  • Faulty fuel injector(s)
  • Faulty catalytic converter(s)
  • Stuck/blocked EGR valve / passages
  • Faulty camshaft position sensor
  • Defective computer
  • Dec 10, 2010 | 2000 Buick LeSabre

    2 Answers

    04' Ram 1500, bad mis-fire. cust repl s/plugs. no help. Codes for coils #7 & 8 w/mis-fire. replaced coils & wire set. Better, but still P0300. Compression good

    You still have random misfires (PO300)
    You most likely replaced those coils that set a code, and those were not the one bad offender,spiking the computer module.
    Take a new coil and put in a cylinder,no change, replace old coil and move new one to next cylinder. You can do that once or twice a day, if you have nothing else to do. You need a 90 degree day, to really get that solved,unless you have an ignition oscilloscope.
    Never had a bad spark plug in 45 years.

    Sep 18, 2010 | 2004 Dodge Ram 1500

    1 Answer

    I have an 2002 buick century that has a iginition miss. We have changed the spark plugs, iginition wires, coil pack. It first came back with a miss fire number 2 cyclinder. The coil pack was changed. Now...

    double check plug wires to be sure they go to the right cylinders. After that i would check fuel injectors
    You need a listening device and listen for metallic clicking sound. Bad injectors will be silent and they do cause the same miss

    Apr 21, 2010 | 1997 Buick LeSabre

    2 Answers

    Trouble codes for saturn ls2 car is showing the following trouble codes. po300, po306, po451 p2bo3 and c112b

    P0300 Multiple Cylinder Misfire Detected

    P0306 Cylinder 6 Misfire Detected

    P0451 EVAP Pressure Sensor Range/Performance

    I have no idea what those last two are. Typo, maybe?

    Your first two codes could be caused by old spark plugs and/or leaking plug wires.

    Your EVAP code could be a bad fuel tank pressure sensor or a malfunctioning EVAP system. With that code, if you remove your fuel cap and get a whoosing sound, then it is an issue with your EVAP system not properly venting the tank. If you don't get that sound, then the tank pressure sensor is bad.

    Mar 05, 2010 | 2000 Saturn Ls 4dr Sedan

    1 Answer

    One of the coil packs is not working on a 3800 V 6

    have you tried changing the coil pack? they are simply a coil of wires inside. they easily go bad. just to be sure switch one of the coil packs to make sure its not a problem with the wiring, if the problem switches cylinders replace the coil pack

    Aug 28, 2009 | 2000 Chevrolet Camaro

    1 Answer

    97 Lesabre misfire

    change all plugs an wires if you still get the misfire on #3or#6 the coil pack is parabley bad

    Jul 17, 2009 | 1997 Buick LeSabre

    2 Answers

    Code is po300 multiple cylinder misfire. intermittent..

    vacuum leaks, plugs, check the wires for corrosion on the coil packs, the 3800's are known for corroded contacts there, also a common problem is the intake gasket leaking near the egr valve, check to see if it is wet around where the egr valve enters the intake manifold, check for fuel pressure, and make sure all the sensors and vac lines are plugged in properly

    Jun 20, 2009 | 2000 Buick LeSabre

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