Question about 2005 Chrysler 300

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Random misfire Engine light stays on. Shudders when in park. Replaced EGR valve and six O2 sensors. Could this be a burnt valve like the dealership said it was? Codes read random misfire. Have replaced plugs.

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  • Anonymous Mar 16, 2014

    replaced timing belt and crank sensor, coil packs, still misfiring



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HI!!!!!!! to star .. from the coil pack w/ the engine runiig take off the wire and if you have spark than every wire is sparking the wires and plugs are Ok. the problem is in the ignition control module

Posted on Feb 26, 2009

  • delgadostat Feb 26, 2009

    I forgot to tel you when you testing the wires from the coil packs cont be to close to the car you might get electric feels hold each wire w/ long nedle plaiers w/ ruber at the end again becareful



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I have a 99 Chevy Suburban 1500 it is giving me a random multiple misfire code however it seems to be running nice and smooth I've changed the cap the rotor button the plugs the wires I don't know what is...

Hello Donald!

First of all, a lot of misfire condition are not directly linked to the ignition system of the vehicle. For instance a lazy O2 sensor (B1S1) or one with a burnt out heating element can cause the issue. One thing that is easy to check that can cause misfires is a defective EGR valve. You can remove it from the car and inspect that it closes nice and tight by pouring some fluid on the intake part of the EGR valve and see if the other side gets wet. Alternatively, you can inspect it on the vehicle. Simply start the car when the engine block is cold, let it idle and then put your finger on the base or intake side of the EGR valve and wait 2-3 minutes. If it become so hot you cannot touch it with your fingers in that 2 minute delay, it needs to be replaced. What happen is that when the EGR valve stays partly open (stuck open or simply defective), part of the exhaust gas, which are burning hot, get sucked in by the vacuum from the air intake and passes through the EGR valve and heat it up fast. A proper operating valve will not open until the engine reaches a certain temperature (usually around 80°C)and when the car is being driven, both condition only meet way after 2 minutes. If I remember right, the truck you possess (a 2 wheel drive I presume) has a 4.3L GM engine with a Vortec intake system. If so, the EGR valve should be right in front of the engine, behind the radiator fan and near the intake manifold. Also, be sure to place back the EGR valve in the same direction than it was, rotating it 180° will cause the valve to be stuck open by the engine's vacuum and WILL cause misfires. and rough idle.

I've attached a picture of what it should look like on your truck. The arrow is pointing the front of your car by the way

If it did solve your problem, please consider giving me some credit, doing so will help me progress in rank and providing more solutions on Fixya

Warm regards!

Samuel G. ,
Automotive technician for Subaru Canada

Feb 12, 2015 | 1999 Chevrolet Suburban

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Keeps throwing the p0300 code, random misfire

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/leaking EGR valve / passages Faulty camshaft position sensor Defective computer

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98 Pontiac GRAND am

The plugs and crank sensor could have done it, but the TPS and idle air control would have nothing to do with a random miss.
A more likely cause is the ignition module or a fuel problem. You may have to wait until the problem is bad enough to kill the engine or you have more codes to check out.

May 20, 2013 | Cars & Trucks

1 Answer

2002 Mazda Tribute V6 shaky idle and tugs and pulls at a stop light. It feels like a slight misfire.

Cam sensor. I have had the same problem, we have replaced air intake, crank shaft sensor, fuel injectors, coils, spark plugs, converters, and the cam sensor has seemed to help so far

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1997 Saturn EGR Check Engine Light

saturn had a lot of problems with the coil posts getting rusty that will cause the misfire on cylinder number 3 and any skip will cause the random misfire see as one coil fire two cylinders the egr sensor is built into the vavle and try stick closed from carbon build up cleaning it will only putoff replacing it if it operates at all

Jun 12, 2012 | Cars & Trucks

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98 silverado random misfire

run a compression test to check for loose valve seat insert . no 1 cylinder
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Sep 26, 2017 | Cars & Trucks

1 Answer

2003 Chevy pickup 5.3L engine. Misfires during strong acceleration. PO300 computer code. Changed coils, plugs, wires, MAP sensor, fuel pump, EGR valve, to no avail. Suggestions?

Misfires must be diagnosed. As you can see, randomly changing parts in an attempt to diagnose the problem can be vert COSTLY. Besides all the parts that you have allready replaced, there could be a problem with the fuel injectors, there could be cylinder compression problems caused by a number of possible causes including bent/burnt valves, broken valve springs, or a head gasket blown between cylinders. There could be timing problems due to erratic knock sensor input. Fuel shutoff due to throttle position sensor "dropout". "Random" misfires (which is what a code P0300 code is) can even be caused by something as crazy as a vacuum brake booster leaking and creating a large vacuum leak....the list goes on and on....

It is easiest and most cost effective way to diagnose this type of problem is by using a scan tool and looking at all of the engine data and/or taking a "snap-shot" of the data when the problem is occuring. This way, you can tell which parts of the engine control system are being affected so those areas can be inspected for possible failures. The first step is to isolate the causing SYSTEM. So far, you have replaced parts for the fuel system, the ignition system and the EGR system....

Oct 30, 2011 | 1999 Chevrolet C1500

1 Answer

99 5.4 Expedition issues

P0401 - EGR Flow Insufficient Detected The EGR system is monitored during steady state driving conditions while the EGR is commanded on. The test fails when the signal from the DPF EGR sensor indicates that EGR flow is less than the desired minimum.
  • Vacuum supply
  • EGR valve stuck closed
  • EGR valve leaks vacuum
  • EGR flow path restricted
  • EGRVR circuit shorted to PWR
  • VREF open to DPF EGR sensor
  • DPF EGR sensor downstream hose off or plugged
  • EGRVR circuit open to PCM
  • VPWR open to EGRVR solenoid
  • DPF EGR sensor hoses both off
  • DPF EGR sensor hoses reversed
  • Damaged EGR orifice tube
  • Damaged EGRVR solenoid
  • Damaged PCM

P1299 - Cylinder Head Over Temperature Protection Active Indicates an engine overheat condition was detected by the cylinder head temperature (CHT) sensor. An FMEM Strategy called Fail-safe Cooling was activated to cool the engine.
  • Engine cooling system concerns
  • Low engine coolant level
  • Base engine concerns

P0300 - Random Misfire The random misfire DTC indicates multiple cylinders are misfiring or the PCM cannot identify which cylinder is misfiring.
  • Camshaft position sensor (CMP)
  • Low fuel: less than 1/8 tank
  • Stuck open EGR valve

P0443 - EVAP Control System Canister Purge Valve Circuit Malfunction The PCM monitors the EVAP canister purge valve circuit for an electrical failure. The test fails when the signal moves outside the minimum or maximum allowable calibrated parameters for a specified purge duty cycle by PCM command.
  • VPWR circuit open
  • EVAP canister purge valve circuit shorted to GND
  • Damaged EVAP canister purge valve
  • EVAP canister purge valve circuit open
  • EVAP canister purge valve circuit shorted to VPWR
  • Damaged PCM

P1451 - EVAP Control System Canister Vent Solenoid Circuit Malfunction Monitors the canister vent (CV) solenoid circuit for an electrical failure. The test fails when the signal moves outside the minimum or maximum allowable calibrated parameters for a specified canister vent duty cycle by PCM command.
  • VPWR circuit open
  • CV solenoid circuit shorted to PWR GND or CHASSIS GND
  • Damaged CV solenoid
  • CV solenoid circuit open
  • CV solenoid circuit shorted to VPWR
  • Damaged PCM

P1309 - Misfire Monitor Disabled When the misfire monitor is disabled, usually due to the input signal generated by the camshaft position (CMP) sensor, by sensing the passage of teeth from the CMP wheel.
  • Camshaft position sensor
  • Powertrain control module
  • ECT, MAF, and CKP sensors

with the codes you have here I would look in the direction of the egr valve first because that will cause the bucking and stalling, and the misfires, but so will the canister vent solonoid. the misfire codes and the cylinder overtemp code could be from overheating or because if the misfires.

Jul 27, 2009 | 1999 Ford Expedition

2 Answers


Have you replaced the coil yet? I assume by all 4 cylinders misfiring you mean P0300 Random Misfire? It could be a number of other things - a faulty fuel injector, coil, etc. Read this article for more info on random misfires -

Dec 14, 2008 | 1997 Toyota Tacoma

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