Question about 2000 Jaguar S-Type

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Engine misfire? Not changing gear.

Hi there, I have a problem with the above.I think it may be related to a misfire or non firing cylinder.
Acceleration is very poor, fuel consumption is currently at 24 mpg even with the most conservative driving. Rev counter will hit 5000 and stay there and there is also a rattle from under the bonnet, The autobox will not change up unless i take my foot off the gas, let the revs drop then it changes.
I initially thought this was a gearbox problem, but I think the ECU is sending wrong info to the box and the box is trying to react to this false information. I'm thinking of a faulty coil, lead or plug.

Does anyone have any ideas??

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  • 489 Answers

Check your coils and plugs , fuel filter and air filter

Posted on Aug 13, 2009

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1 Answer

P0300 code silverado 1500 4.8v8 engine multi mist fire


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Code P0300 is a code that is generated when your engine has a misfire that is not related to only one cylinder. Sometimes this code will be set in addition to other codes such as P0301 which means that there is a misfire on cylinder 1 (cylinder 1 is the number one cylinder when looking at the firing order.

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My 2001day Ford Escape XLT has check engine light on. The parts store pulled the codesand its a gear 3 ratio issue and a miss fire on first and second cyl. Could these two be related or does the gear ratio...


Gear ratio does point to an internal transmission issue. The misfires can easily be diagnosed by swapping thing around and seeing if the code follows. For example misfire in cylinder number 1 & 2 swap coils to cylinder number 3 & 4 and if the code changes from P0301(2) to P 0303(4) you know you need coils.

Feb 25, 2013 | Cars & Trucks

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2001 mercury sable OHC 3L engine random misfire under load I changed plugs wires coil pac fuel filter ,even the computer and had it reflashed . it idles just fine but put it in gear aply throtle to take...


How about a clogged exhaust converter

How about the front oxygen sensors

How about smoke testing for vacuum leaks

Either of them overlooked

How is it possible you have a computer reflashed
& those folks would even give you the car back like that
That fact alone is beyond me

Are the wires on correctly

Have you had a scope on the secondary ignition & looked
at the firing lines of all cylinders & the timing of those events,
in relation to when they should occur

720 degrees divided by 6 cylinders should be 120 degrees,I think

What does fuel trim look like at idle & on a road test-start there
Then go to Mode #06 to look at cylinder misfire counts

Feb 19, 2013 | 2001 Mercury Sable

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Acura tl 3.2 2000 engine mis fired


the P0301 means Cylinder 1 Misfire Detected, and the P0303 means Cylinder 3 Misfire Detected. I think have known how to fix the problems after you knew where is the problem.

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My 2005 ford f250 is having random mis-fires and multiple mis-fires. Can you give me any advice


Hi there:

The misfire detection monitor, a software strategy built into the computer, is designed to detect an engine misfire. The computer can also normally identify the specific cylinder in which the misfire has occurred. A misfire is nothing more than a lack of combustion, which can be caused by poor fuel quality or metering, low compression, lack of spark or unmetered air entering the engine. There are other possible, less obvious causes as well, such as uncommanded Exhaust Gas Recirculatin (EGR), flow. When the misfire monitor detects a misfire, it will trigger the check engine light with the specific cylinder number as the last digit in the P030X code. For instance cylinder 1 misfire is P0301, cylinder 2 is P0302 etc. In this case we have either multiple cylinders misfiring, or the computer simply can't determine the specific cylinder, and as such we are left with the P0300 in computer memory.


Possible Causes:
Fuel injectors, related wiring, sensors and computer issues
Running out of gas, or poor fuel quality
Evaporative emissions system (EVAP) concerns: fuel vapors leaking into engine
Incorrect Fuel Pressure
EGR system concerns: leaking EGR valve or restricted ports
Base engine concerns: low compression, valve train problems and timing issues
Ignition system concerns including, but not limited to:
Faulty spark plugs
Faulty coil or related wiring
Ignition module or related wiring issues
Ignition related sensor faults or wiring issues


Diagnostic:
To diagnose a P0300 trouble code we begin by checking for proper fuel and ignition system operation, and then follow up with the less likely causes listed above, such as EGR and EVAP system problems. New style coil on plug applications have a high failure rate, and can be concluded faulty by swapping to another cylinder and checking to see if the misfire moves to that cylinder. This is a quick check if a capable scan tool or oscilloscope is not available. Always make sure the basic maintenance is done first and that things such as the fuel filter, air filter, spark plugs and spark plug wires are in good working order, as these are all possible candidates for a problem. If necessary, check for wiring and component concerns.


Hope this helps; also keep in mind that your feedback is important and I`ll appreciate your time and consideration if you leave some testimonial comment about this answer.

Thank you for using FixYa, have a nice day.

Aug 07, 2012 | 2005 Ford F 250 Super Duty

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2007 Pt Cruiser I Changed spark plugs 2 weeks ago Bosch Platinum +4, car is non turbo 2.4 ltr engine. within 1 day engine light on cylinder 1 miss fire, read on the net changed plugs to Champion RE14MC...


remove the plug from the #1 cylinder, and install it into the #2 cylinder , and put plug from # 2 clyinder in to #1 plug hole, connect plug wires, and start up vehichle, and if computer shows misfire on # 2 cylinder , then you have a bad plug, possibly porcelin insulator could have a hair line crack in it, hope that this information has helped you.

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2 Answers

Throwing P0301 and P0302 fault codes as of yesterday. Check engine light has been on and threw code of P1450 about 3-4 months ago. Figured it was an evap issue and no big deal thats why I never remedied...


those are misfire codes. Cylinder #1 & #2 in the firing order. Check for bad plugs first. Swap one of the misfires with a non misfire cylinder and see if that cylinder misfires. Or just change the 2 plugs. Put high temp anti seize on the threads if you ever want to remove them later.

Then change the 2 COPs (Coil on Plug).

Finally, check for plugged or bad injectors. CHevron Techron injector cleaner is the best. Add to 1/4 tank of gas for better cleaning.

Report results.

Please rate too. Thanks.

Dec 22, 2010 | 2001 Ford F150 Styleside SuperCrew

1 Answer

Misfire on number 2 cyl


Cylinders are numbered from front to rear (grille to firewall) passenger side: 1-2-3, driver's side: 4-5-6. Firing order is 1-4-2-5-3-6
Did you check by pulling #2 out while the engine is in idle to see no weakness from the engine? BTW your coil pack cost $80.

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99 Daewoo Leganza DTC P0301


When the misfire monitor detects a misfire, it will trigger the check engine light with the specific cylinder number as the last digit in the P030X code. For instance cylinder 1 misfire is P0301, cylinder 2 is P0302 etc.

The misfire detection monitor, a software strategy built into the computer, is designed to detect an engine misfire. The computer can also normally identify the specific cylinder in which the misfire has occurred. A misfire is nothing more than a lack of combustion, which can be caused by poor fuel quality or metering, low compression, lack of spark or unmetered air entering the engine. There are other possible, less obvious causes as well, such as uncommanded Exhaust Gas Recirculatin (EGR), flow.



P0301:

Possible Causes:
Fuel injectors, related wiring, sensors and computer issues
Running out of gas, or poor fuel quality
Evaporative emissions system (EVAP) concerns: fuel vapors leaking into engine
Incorrect Fuel Pressure
EGR system concerns: leaking EGR valve or restricted ports
Base engine concerns: low compression, valve train problems and timing issues
Ignition system concerns including, but not limited to:
Faulty spark plugs
Faulty coil or related wiring
Ignition module or related wiring issues
Ignition related sensor faults or wiring issues

P0302:

Possible Causes:
Fuel injectors, related wiring, sensors and computer issues
Running out of gas, or poor fuel quality
Evaporative emissions system (EVAP) concerns: fuel vapors leaking into engine
Incorrect Fuel Pressure
EGR system concerns: leaking EGR valve or restricted ports
Base engine concerns: low compression, valve train problems and timing issues
Ignition system concerns including, but not limited to:
Faulty spark plugs
Faulty coil or related wiring
Ignition module or related wiring issues
Ignition related sensor faults or wiring issues

Apr 02, 2009 | 1999 Daewoo Leganza

1 Answer

Chech engine light code OMDII 300 vehicle back fires from stand still till speed 35 to 40 mhp 1998 corolla can you help


OBD II 300 Random/Multiple Cylinder Misfire Detected

When the misfire monitor detects a misfire, it will trigger the check engine light with the specific cylinder number as the last digit in the P030X code. For instance cylinder 1 misfire is P0301, cylinder 2 is P0302 etc. In this case we have either multiple cylinders misfiring, or the computer simply can't determine the specific cylinder, and as such we are left with the P0300 in computer memory.

Possible Causes:

Fuel injectors, related wiring, sensors and computer issues
Running out of gas, or poor fuel quality
Evaporative emissions system (EVAP) concerns: fuel vapors leaking into engine
Incorrect Fuel Pressure
EGR system concerns: leaking EGR valve or restricted ports
Base engine concerns: low compression, valve train problems and timing issues
Ignition system concerns including, but not limited to:
Faulty spark plugs
Faulty coil or related wiring
Ignition module or related wiring issues
Ignition related sensor faults or wiring issues

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