Question about 2001 Jeep Grand Cherokee

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Code reader says 1-3-5 is missing but I know 1&5 is firing jERRY b

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Code reader, (scan tools work better)
P0301, 303 and 305
so those are misfiring,
it means really , bad combustion 1,3,5.
that can be many things. Compression, spark and injection all must be good or? it fails)
ever change out spark plugs this decade??????

Posted on Apr 27, 2015

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Jerry,you are smarter than that code reader,you know whats wrong,just go with what you know,throw that code reader out

Posted on Apr 26, 2015

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Intermittent misses can be caused by bad coils, dirty fuel injectors, and bad o2 sensors, to name a few.

Posted on Apr 26, 2015

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1 Answer

Got a 2004 that sounds like its missing and it also loses power when taking off and is using so much gas . Any suggestions why its doing this and can i do for it using so much gas


not knowing what kind of car doesnot help, but if it sounds like its missing, and loses power on taking off ,plus burn alot of fuel , i guessing that it has a miss fire, i would bet that the service engine light on the dash is on, of blinking . if it is on acode reader will give you what cly. is missing. and that can be anything from a spark plug to a coil. fuel injector, with out know if and what the codes are not much help.

Oct 30, 2013 | Cars & Trucks

1 Answer

PO300 code


Code 300 means you have a random miss that is not serious enough to pick one cylinder. The computer measures RPM on each cylinder as the plug fires. So it is not that a cylinder is not firing but rather that it is not producing enough power.
Other causes are vac leaks and lack of fuel.

Aug 06, 2013 | 2004 Chevrolet TrailBlazer

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2006 jeep liberty once I hit second gear it vibrates


multiple code issue (evaporative, catalyst efficiency, and miss fire)doubtfull all 1 source of error but draw attention to the miss fire code PO300 is a random cylinder miss fire, possible crank position or cam position sensors.but i would check timing first.

Mar 25, 2013 | 2006 Jeep Liberty

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My 2004 chevy trailblazer is missing badly. Had them read the code for me at auto zone and it said I had a miss fire on the number one cylinder. I changed the plugs and it is still missing badly


Try moving the coil pack from cylinder 1 to another cylinder (swap locations) and see if the same code comes up. If code is different, then coil pack is bad. Other reasons for miss; bad injector, poor compression.
Also, I know you changed plugs already, but always use AC Delco 43-103 plugs on this vehicle.

Sep 11, 2011 | 2004 Chevrolet TrailBlazer

1 Answer

I am getting two codes of P1451 and P0305 on the code reader. Have tried diferent things but still there. HELP!!!!!


Problems are not related. Concentrate on the P0305 first.
Cylinder 5 miss fire. Go with #1, #2 and #8 first. one at a time
The other code is gonna take a mech with some test equip.
Good luck
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  • Faulty coil (pack)
  • Faulty oxygen sensor(s)
  • Faulty fuel injector
  • Burned exhaust valve
  • Faulty catalytic converter(s)
  • Running out of fuel
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Check engine light is on and it reads Misfire on #2 cylinder. Also oxygen sensor bank2 sensor 1 and Bank 1 sensor 3 behind the converter. Engine running rough.


the engine miss fire can cause the other codes to set. you need to repair the miss fire and clear all codes after the miss is repaired then see if the 02 sensor codes return. the miss fire is probably a bad spark plug wire a good tune-up should take care of it ........HAVE A GREAT DAY

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1 Answer

I had this code PO300, P0302, and p0301. I changed my spark plugs but engine wont't start.I'll like also to know the probable causes of misfiring too,please.


300 is multiple cylinders miss fire, 301, 302 you have cylinder 1 and 2 miss fire. check your wires and fuel injectors on those cylinder

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Firing order 1984 olds firenza


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Apr 20, 2009 | 1984 Oldsmobile Firenza

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