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Scan codes p03o4 po300 alot at diff times did plug wires cap rotor

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6 Suggested Answers

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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Posted on Jan 02, 2017

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3dmaster
  • 183 Answers

SOURCE: 1996 Chev. 1500 pickup truck, 305 C.I. PO300 code

Than you problem solved by yourself already,

Dear you had done good job for your dream,

just some modification nedds like,

CHECK YOU ENGINE MOUNTINGS,OR THIGHTEN IT,
YOU HAVE TO ALSO CHECK YOUR PLACEMENTS ORDERS OF YOUR ENGINE THAT NOT TO BE CHENGED AFTER YOUT TRY.

THNX

Posted on May 20, 2008

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  • 1 Answer

SOURCE: chevy s-10 2003 4.3 lt v-6 4x4

check the mass air flow sensor on the air intake. it might be pluged. i had the similar problem on my 98 s10.

Posted on Jul 26, 2009

  • 290 Answers

SOURCE: 98 blazer 4.3 4x4. runs very rough. scan code

ethanol gas problem. add a can of SEAFOAM to tank of Premium gas. change fuel filter after 100 miles. then add SEAFOAM 3-5000 miles to keep fuel line/system;emissions, and valves clean of ethanol goop and water which is created by this awful ethanol mixture.

Posted on Aug 31, 2009

Molson02536
  • 3854 Answers

SOURCE: i own a 96 chevy k1500 5.7 l vortec and have a no 5 cyl misfire

It could be a faulty fuel injector, try running a fuel injector cleaner through your fuel system. At worst the poppet nozzle has gone bad and will need to be replaced, you can buy the poppet nozzle it self individually at Auto Zone or buy upgrade MFI system which is much better and less pron to fuel leaking room a cracked poppet line or nozzle which will cause what you have described.

Posted on Feb 03, 2010

Testimonial: "very helpfull, allthese year i thought i had throttle body as it turns out i have muti port. thanks for the fix."

  • 1 Answer

SOURCE: my jeep idles rough but on acceleration is

hola como puedo saber cual es el problema con mi 96 grancheerokie cada vez que acelero despues de 1500 rpm el motor pierde fuerza y avienta explociones por el throurolbody ya cambie los sparkplugs,cables, rotor, cap y el motor ya esta a tiempo herreravazquez2006@yahoo.com

Posted on Apr 07, 2010

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2000 chevy astro van 4.3 v6/I changed dist.cap 4 times in 1 year rotor too/runs rough,hesitation,bad ildeing,could it be dist.gear /shaft are worn/got code po300


code p 0300 is random/ multiple misfires
each p 0300 code ( 0301,2,3,4 etc) indicates the piston at fault
this code can be from electrical , ( cap plugs wires etc ) but is mostly attributed to problem injectors and ecm injector controls --wiring and connections
check the other areas for the fault as you may be concentration on the wrong area

Oct 24, 2016 | 2000 Chevrolet Astro

3 Answers

Gm code po300


This is a misfire code. Start with the basics, fuel filter, spark plugs, vacuum leaks, wires etc. If after checking/changing necessary parts, if problem persists you will need to go deeper as in coils and computer controlled parts such as map sensor, maf sensor

Sep 10, 2014 | 2002 Chevrolet Blazer

1 Answer

2000 nissan frontier rough idle and has a po325,po300,po120,and po304


THROTTLE POSITION SENSOR, MISFIRE, #4 MISFIRE, KNOCK SENSOR, THESE ARE YOUR TROUBLE CODES, PO120,PO300, PO304, PO325, RESPECTIVELY, REPLACE THE TPS @ THROTTLE BODY, REPLACE KNOCK SENSOR , @ ENGINE BLOCK, REPLACE YOUR SPARK PLUGS & PLUG WIRES ! AND YOU MUST ALSO REPLACE BOTH YOUR AIR & FUEL FILTERS, DISTRIBUTOR CAP & ROTOR , INSPECT, MAY NEED TO REPLACE, I WOULD ANYWAY !!!!!!!! ADD SOME GOOD FUEL INJECTOR CLEANER TO TANK, NEXT FUEL UP !

Apr 02, 2013 | Nissan Frontier Cars & Trucks

1 Answer

1999 nissan pathfinder ps300 misfire code can you helpme with this


Replacing parts is not how you diagnose a misfire

You need to look at scan tool data & see the type of misfire
& what the cylinders are & misfire count

Spark Plugs, I just replace every three years,nothing to do
with diagnosing your problem

I never replace wires. I have owned at least two vehicles
that went 17 & 18 years on OE wires
I test them & replace if they were to fail in some way,
or the ends come off

Cap & Rotor can be cleaned,a new one isn't needed to
diagnose a problem

You need to put a fuel pressure gauge on it

Make sure you have no vacuum leaks anywhere,
evap,exhaust,intake ducting,hvac,everywhere

You can't leave the O2 Sensors in there forever,
100,000 miles 6 or 7 years is plenty

You have more than a PO300 code What are they?

Jun 17, 2012 | Nissan Cars & Trucks

1 Answer

A few months back my daughter took her 2000 nissan maxima in and had it scan with a obd11 and she was told it was a o2 sensor, she did nothing ,so i took it in today and it reads po300 code.[misfire...


It shoudn't be. Your oxygen sensors detect the oxygen in the engine. A misfire can be a few things, such as spark plugs/coils, wires, distributor cap and rotor, cam sensor, crank sensor, ecm. I would start with a tune up. If it has been more then 75,000 miles since you changed the plugs and wires, it could be that. Has it been acting up, such as hesitations, stalling when you slow down or stop?

Feb 11, 2011 | 2000 Nissan Maxima

3 Answers

My S-10 keeps giving a P0300 dtc. Can't figure out what is setting this code. Usually misfires at idle. Any suggestions?


if u change plug wires ,coils ,plugs and still having problems check the injecter with a pulse light the one that dont pulse the pcm is bad are broke wire if all of them are pulseing then change the injecter.had the same problem on a 2000 s10 2.2

Apr 27, 2010 | 2000 Chevrolet S-10

1 Answer

Engine lights comes on checked code and po300 comes up


that's a multiple cylinder missfire code(random). Has it been a bit shaky recently? if you haven't performed a tune up recently, it's time to do so. replace plugs, wires, and in some cases, the distributor cap and rotor if equipped.

Feb 16, 2010 | 2003 Dodge Caravan

2 Answers

1996 Chev. 1500 pickup truck, 305 C.I. PO300 code


Than you problem solved by yourself already,

Dear you had done good job for your dream,

just some modification nedds like,

CHECK YOU ENGINE MOUNTINGS,OR THIGHTEN IT,
YOU HAVE TO ALSO CHECK YOUR PLACEMENTS ORDERS OF YOUR ENGINE THAT NOT TO BE CHENGED AFTER YOUT TRY.

THNX

May 20, 2008 | 1996 Chevrolet K1500

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