Question about 2003 Chevrolet Impala

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05 Impala missfire code 301 have changed

05 Impala 3.8 missfire code 301 have changed wires,plugs,coil,ignition mod, injector,fuel pump,fuel pressure reg changed still don't hold pressure with key on still has missfire code. help

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  • Anonymous Mar 27, 2014

    FUEL PRESSURE IS TOO HIGH. RICH CODE PO172

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Check intake for vaccum leaks,the gasket also and egr valve, thats alot of parts to have replaced without diagnosing first, if there are no fuel leaks and you said all injectors were replaced then you have a defective fuel pump, also these engines had misfire problem because of dirty injector but you replaced them so count that out. good luck.

Posted on Nov 02, 2009

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If the regulater and or the fuel bar do not hold pressure I would check the fuel lines to the pump from the regulated there could be a small air leak!

Posted on Feb 28, 2015

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If the engine is not miss fireing i would check for a program update, for ecm.next you could have crank sensor bad or a crank sensor camshaft sensor miss correlation.i would go visit the chevy dealership.hope this helps

Posted on Nov 04, 2009

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99 rx 300 I have trouble codes p0300, p0301, p0303, p0305, po172, and p0171.Stomped


codes p 0300 through refer to misfires on each cylinder with the end number ( 301 is no 1 cylinder , 302 is no 2 cylinder ans so on)=== causes --engine mechanical fault , ---wiring---ignition/ fuel ---injector/s---ECT/ MAF sensor/s ---ECM
most misfires are from injector faults like dirty/blocked tips, low fuel pressure , no pulse or problem pulse from ECM rather than plugs and wires and coils
codes p0171 refers to system to lean bank 1===causes ---intake exhaust leak---air system---maf/vaf sensors ---fuel pressure / pump---injectors ---heated oxygen sensor ( HO2S)
code p 0172 is system to rich-====causes ---intake blocked ---EVAP cannister purge valve ---fuel pressure --EGR system---injector/s ---HO2S
couple these two codes with the misfire codes , I suggest you look at the injectors, fuel pressure (too low) from EVAP problem not venting tank, fuel pressure regulator, EGR system

Aug 17, 2016 | Cars & Trucks

2 Answers

I have a 2011 cruze 1.6,i have a missfire,have changed the plugs to no avail still missfireing,any help would be appresiated thanks


bad injector--bad coil --if misfire is not a constant cylinder than fuel pressure cam sensor/crank sensor and such

Jun 20, 2016 | Cars & Trucks

1 Answer

I have a mitsubishi delica space gear 2002 model that is misfiring we cant find the problem.


misfiring is more often from--- faulty injectors , wiring to the injectors and fuel pressure than plugs , coils and wires
the codes read fro p 0300 , 301-302-303-304-305-306 and each code indicates the piston that records the fault
misfiring can be from mechanical fault( loose valve inserts - burnt valves - to
wiring , plugs, HT leads, distributor cap faults ( in it doesn't have multiple coils ) , coil/s fuel pressure , injector/s injector wiring and ECM
You need to broaden the scope of investigation to get to the cause and one way to pinpoint the cylinder is to run the fault codes

Feb 24, 2016 | Mitsubishi Cars & Trucks

1 Answer

Firebird v6 multiple missfire p300 code and trouble starting.


- Faulty spark plug (s) - Faulty ignition coil (s) - Clogged or faulty fuel injector (s) - Intake air leak - Fuel injectors harness is open or shorted - Fuel Injectors circuit poor electrical connection - Ignition coils harness is open or shorted - Ignition coils circuit poor electrical connection - Insufficient cylinders compression - Incorrect fuel pressure What does this mean? Read more: http://engine-codes.com/p0300_pontiac.html#ixzz2jdmmbwJ9

Nov 03, 2013 | Cars & Trucks

2 Answers

What could this be?


CODE 301 IS #1 MISSFIRE 300 IS RANDOM MISS FIRE 201 IS INJECTOR FAULT . I WOULD START BY SWAPPING # 1 INJECTOR WITH SAY # 3 AND SEE IF THE MISSFIRE MOVES TO #3 IF SO REPLACE INJECTOR, IF NOT THERE COULD BE WIREING ISSUES

Oct 16, 2013 | 2006 Jeep Liberty

1 Answer

Cyl 3 missfire . i changed coil n plug and checked injector , cleared coded but i still get the code poping back up


could have bad plug wire.fuel injector number 3 wires at connector could have short or open.PCM not firing fuel injector 3 could have intake manifold leak at cylinder 3 could mechanical failure at cylinder 3.

Aug 15, 2013 | 2004 Ford F150

1 Answer

96 acura tl 2.5 rough idle after warm up with rpm swings ignition and fuel pressure good sparkplugs black and new codes; primary o2 heater circuit bad missfire cyl.5 random missfire


REPLACE DISTRIBUTOR CAP AND ROTOR REPLACE SPARK PLUGS AND WIRES IF NOT BEEN CHANGED IN LONG PERIOD OF TIME.CHECK IGNITION TIMING.CHANGE AIR FILTER CLEAN FUEL INJECTORS.IF ENGINE STILL MISFIRE IGNITION COIL IS WEAK OR YOU HAVE LOW CYLINDER COMPRESSION.

Jul 21, 2011 | 1996 Acura TL Series

1 Answer

My car wont start


1 Inspect Battery -- Battery Discharged or Faulty.
2 Inspect Battery Cable -- Corroded, Broken, Shorted or Poorly Connected Battery Cable.
3 Inspect Distributor Cap -- Distributor Cap Cracked or Burned.
3 Inspect Fuel Filter -- Clogged or Dirty Fuel Filter.
5 Inspect Coil - Ignition -- Faulty Ignition Coil.
6 Inspect Wireset -- Worn, Damaged or Faulty Spark Plug Wire(s).
7 Inspect Spark Plug -- Incorrectly Gapped or Fouled Spark Plug(s).
8 Inspect Starter -- Starter Motor Faulty.
9 Inspect Fuel Pump -- Low Fuel Pressure.
10 Inspect Solenoid Switch -- Faulty Starter Solenoid Switch.
11 Inspect Relay - Fuel Pump ----- Faulty Fuel Pump Relay.
12 Inspect Fuel Injector Pressure Regulator --- Faulty Fuel Injector Pressure Regulator.
13 Inspect Ignition Switch --- Improperly Connected or Faulty Ignition Switch.
14 Inspect Starter Drive --- Faulty Starter Drive.
15 Inspect Fuel Injector --- Dirty or Worn Fuel Injectors.
16 Inspect Fuel Pump Strainer ---- Clogged or Dirty Fuel Pump Strainerat.

Mar 17, 2011 | 1995 Buick LeSabre

1 Answer

What is a p0307 code on a dodge truck 1500 5.7 hemi 2004 the truck is missing on one cyl.


P0301-P0308....2T catalyst........2004-05 Ram...Cylinder 1-8 Misfire Detected Conditions: Any time engine is running and the adaptive numerator has been successfully updated. When more than 1.5% (300M, Magnum), 2% (Durango, Ram), 2.5% (Durango LEV, Ram LEV), misfire rate is measured during 2 trips, or with 10-30% misfire during 1 trip. 3 good trips required to turn off MIL. Possible Causes: ASD relay output 2 circuit fault Injector control 1 circuit fault Coil control 1 circuit fault Ignition wiring, spark plug, or ignition coil fault Fuel pump inlet strainer plugged Restricted fuel supply line Fuel pump module fault Fuel pressure leakdown fault Fuel injector is damaged or has failed Engine mechanical problems exist PCM has failed. Hope this helps you. Thank You for using fixya.If you like this solution please rate it....Thank You, iluv2fish....Ray

Jun 24, 2010 | 2004 Dodge Ram 1500

2 Answers

Missfire on number 3 coil on 2001 S type Jaguar 3.0 V6 Sport


Check the igniter module.
I assume you have a ecu code telling you #3 coil is missfiring ?
If so also check the crankshaft angle sensor .
If it is not an error code do a compression test and check the injector.
Hope this helps
Regards
George

Jul 08, 2009 | 2001 Jaguar S-Type

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