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2004 buick lesabre 3.8 (vin code k) random misfire code po300 and fans will not run w/o jumper wires replaced two bad coils 6 bad plugs checked egr ( its ok}. replaced bad intake gaskets

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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

fastboyz
  • 674 Answers

SOURCE: 99 buick Lesabre

hey thanks for bringing me up to speed. ive been working on many other problems but with your great explanation i remember.
we need to check the compression on that cyl. and compare it to the compression on 2 other cylinders your choice.
but before you do this get a can of carb cleaner . and with the car idling spray around the intake manifold in the area of #6 cyl. what we are looking for is a small vacuum leak that would also act like this. with the engine idling and spraying around the intake the engines idle sould not change and if it does when you spray you have an intake leaking.
let me know how it turns out.
later
paul

Posted on Sep 23, 2008

  • 1 Answer

SOURCE: 2004 chevy suburban flex fuel misefire

Compression Test the Cylinders. We had one doing the same thing. It was a warped valve on #4.

Posted on Jun 30, 2009

  • 1 Answer

SOURCE: My 1998 Buick LeSabre has a misfire on cylinder

Hi, I would check for a vacume leak around your intake manifold #1 cylinder runner. You can check by using a stethescope with a small piece of brake line in the end of the hose or spraying propane around the intake. If you hit a vacume leak the RPM will drop. Vacume leakes normaly cause a higher RPM at idle.

Posted on Feb 01, 2010

Testimonial: "Very helpful information that I did not think about"

  • 564 Answers

SOURCE: iam getting a code of p0300 random misfire on 98

spark control modular,,

Posted on Apr 19, 2010

jsmes1027
  • 749 Answers

SOURCE: 2004 cavalier 2.2 vin f

I have expereienced this issue several times on the 2.2 ecotech usually ends up being the ignition module itself. I keep an extra module handy just for testing purposes.

Condition/Concern:
Some customers may comment on a severe engine misfire and a SES Light. Upon inspection, DTCs P0300 - P0304 may be found due to misfires on cylinders 1 and 4 or cylinders 2 and 3.
Recommendation/Instructions: If this concern is encountered, inspect circuits 406 (IC Control for 2/3 Coil) and 423 (IC Control for 1/4 Coil) for an intermittent short to ground or poor connection on either end. Depending on the model, these circuits may short on the AC lines near the AC compressor, on the transmission mount, or on the transmission lines where they enter the transmission. If there is no problem found with these circuits, inspect the ignition control module ground to ensure that it is clean and tight.
If there is no problem found after performing the suggestions above and the SI diagnostics lead to ignition module replacement, replace the ignition module as directed but also replace all of the spark plugs and clean the ignition module ground to possibly prevent future ignition module damage.
Measure the resistance of the ground circuit of the ICM from the harness connector of the ICM to a good ground. This should be 3 ohms.If it is not replace the module.

Posted on Jan 03, 2011

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2 Answers

Why won't my car start?


P0300 multiple misfire
P0302 misfire cylinder 2
P0306 misfire cylinder 6

Apr 25, 2015 | Cars & Trucks

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

1 Answer

Misfire po300


Error Code: P0300
Description:
Random/Multiple Cylinder(s) - Misfire Detected
Problem Area:
Air Intake System leaking.
Fuel Supply faulty.
Injector(s) faulty.
Ignition Cable(s) and/or Spark Plug(s) faulty.
Ignition coil(s).Exhaust Gas Recirculation (EGR) Valve stuck/open.
Camshaft Position Sensor faulty.
Low compression.
Wiring.

Solutions:
Check Misfire Recognition.
Check Air Intake System.
Check Fuel Supply.
Check Injector(s) and Injector Sealing.
Check Ignition Cable(s) and Spark Plug(s).
Check Ignition Coil(s).
Check Exhaust Gas Recirculation (EGR) Valve .
Check Camshaft Position Sensor.

Feb 25, 2014 | Chevrolet Cobalt Cars & Trucks

1 Answer

Getting a PO300 code, have replaced the crank, MAP sensors, fuel pump and filter and replaced Coil #3 /new Plugs, i am running out of options. Been like this for two weeks and I need a vechile for work.


P0300 Random/Multiple Cylinder Misfire Detected, if your doing the cylinder number 3 the code should have read PO303,, either way, these are some of what needs to be checked 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
  • 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.

Jun 17, 2011 | Chevrolet TrailBlazer EXT Cars & Trucks

2 Answers

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

    1 Answer

    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...


    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.

    Nov 15, 2010 | 2000 Buick LeSabre

    1 Answer

    2004 Saturn, "L" series, 3 liter V-6. po300,


    300 is random misfire and 306 is cylinder #6, I would check the coil pack on #6. If it has separate coils per cyliner, swap the coil, see if the misfire goes to that cylinder. If it does replace the coil.
    If it has three coil packs you can still swap the coils. If that doesn't fix your problem, then you will have to check the injector with an ohm meter. resistance between the prongs should be between 11 to 15 ohms. check another injector and they should be relatively close. Let me know
    Good luck
    Randy

    Nov 09, 2010 | 2004 Saturn L-Series

    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

    1 Answer

    Misfire of cylinder 2 & 5 on 04 Buick LaSabre Custom


    Ok this may be something smal that may be simple to fixs; your plugs are in the wrong cylinder?

    Check Your gap size .060 (In thousandths of an inch)

    Im not sure of the size of engine please look below for your make?

    82c1f61.jpg

    Fig. 3.8L VIN 1 Engine Firing order: 1-6-5-4-3-2 Distributorless ignition system


    756ae24.jpg
    Fig. 3.8L VIN K Engine Firing order: 1-6-5-4-3-2 Distributorless ignition system


    21520e9.jpg
    Fig. 3.8L (VIN 1 and L) Engines Firing order: 1-6-5-4-3-2 Distributorless ignition system
    321b2dc.jpg
    Fig. 3.8L (VIN K) Engine Firing order: 1-6-5-4-3-2 Distributorless ignition system
    I hope that this help!

    Jun 08, 2009 | 2004 Buick LeSabre

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