Question about 1998 Chevrolet Blazer

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Code p0305 misfire of cylinder 5 the truck is running real rough changed cap, rotor, igintion coil, spark plugs, wires & spider what else can I do? oh & the catalytic converter is cleaned out also

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6ya6ya
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Posted on Jan 02, 2017

  • 422 Answers

SOURCE: 1998 chevrolet k1500 pickup 305 a misfire in # 2 cylinder

hi there, if you can feel the misfire at an idle but not at a higher rpm than the fuel pressure regulator is bad im working on one right now that has mifire code and random misfire codes coming up

Posted on Aug 28, 2008

mcalkins3
  • 123 Answers

SOURCE: catalytic converter still glowing red

When running does the engine shake back and forth (indicating a skip in the engine) also does it rev up freely. If you were to rev it up to 3500RPMS would it be smooth without the engine shaking back and forth? Also the o2 sensor on the front of the exhaust manifold is pretty easy to get at, if you were able to pull that( 7/8") wrench I beleive) you could tell if it were running rich (sooty black color). In the end you could take it to a muffler shop and for very little money have them inspect your cat, without any cutting or welding. a $20-$30 cost at most. I know the fixya wants us to be self suficiant but even i don't mess with small exhaust work because of the benieft of not dealing with it, especially for such a small price. But if its something you wanted to do, I could explain so. A shop can visually inspect the cat, and see if it is clogged with oil, or excessive fuel. At any rate in the end if they do find that you do need a cat, don't buy a GM one, there are plenty of other sources for an aftermarket cat. IF you decided to go that route i know of a few sources that one could be had for pretty cheap ($50-70) for new. Let me know if any of this helps

Posted on Sep 15, 2008

Bat1956
  • 585 Answers

SOURCE: cylinder 1 misfire

If it smooths out at wide open throttle it's probably not the injector but rather a substantial vacuum leak at that cylinder.

Posted on May 06, 2009

  • 34 Answers

SOURCE: 1999 Dodge ram 1500 Cylinder 8 Misfire

Do not dress the spark plug wires to make them look pretty. The spark plug wires on must cross each other at right angles every place they cross. They cannot be run side by side, or the engine will crossfire.

Posted on Jul 07, 2009

  • 1 Answer

SOURCE: need to know the cylinder number locations on a 2004 Mazda MPV

Does anyone know the cylinder number locations??

Posted on Sep 24, 2009

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My 1996 Taurus when I press the gas pedal when cold it sputters and lacks power. When it warms up it runs great.


Possible causes - Faulty spark plug 5
- Clogged or faulty fuel injector 5
- Faulty ignition coil 5
- Fuel injector 5 harness is open or shorted
- Fuel injector 5 circuit poor electrical connection
- Ignition coil 5 harness is open or shorted
- Ignition coil 5 circuit poor electrical connection
- Insufficient cylinder 5 compression
- Incorrect fuel pressure
- Intake air leak

The P0305 code means that the cylinder 5 is misfiring or is randomly misfiring. Start by checking for intake leaks an if no leaks are found the next step is to replace the spark plugs on cylinder 5. If the problem persist more tests needs to be done to diagnose problem, see "Possible Causes



When is the code detected? Engine Cylinder 5 is Misfiring.


When a misfire occurs, engine speed will fluctuate. If the engine speed fluctuates enough to cause the Crankshaft Position (CKP) sensor signal to vary, the Engine Control Module (ECM) can determine that a misfire is occurring.



Oct 21, 2014 | 1996 Ford Taurus

2 Answers

Eng code p0355 and p0305 2007 mbz ml350 eng runs rough but after restarting runs ok.


p0355 indicates that engine misfire is present.

p0305 indicates that the misfire is in the cylinder number 5

Have the spark plug tested/replaced and test the cylinder number 5 spark plug coil.

Jun 09, 2014 | 2007 Mercedes-Benz ML350

1 Answer

P0305 and p0200 on a 2003 chevy blazer 4.3 , runs really rough


P0305 is a misfire on number 5 cylinder replace spark plugs, wires cap and rotor button. Please note: Does the ac cooling line/hose go over top the distributor ? If so GM/CHEY had a problem when dripping from that AC line/hose dripped down onto the distributor. That caused miss fires after a time. I hope this helps, Lee.

Feb 09, 2014 | 2003 Chevrolet Blazer

2 Answers

P0305 cylinder misfire in 96 chevy z71 k1500 5.7 vortec


i would not spend the money on heads w/out diagnosing # 5 misfire. misfire is caused by many different things. i would first start by verifying in fact #5 is at fault. start engine, with it running and using well insulated plyers, pull each wire off dist. cap one at a time. you will notice the engine missing worse each one you pull until you reach the one causing the miss. this wire, when pulled, will not change the evident missing cylinder. if it is #5, check spark, at spark plug end. stick a small screwdriver or equivilent in the removed boot, and place it a cm away from a ground source. start engine. observe spark. should be nice and blue, and ark a good inch from ground. if no spark, swap a wire and check again. if still no spark replace cap and rotor. if their is spark, make check plug. even though new, its easy to crack porcilan installing it. try another plug. if still a miss, start engine with plug removed, breifly, and compression should be evident. strong popping noise of compressed air. a compression gauge is the proper test ( 4 strokes 125 psi) but if audible compression is heard without a doubt, more than likely fine. w spark and compression seeming ok, next is possible fuel, (injector) or intake leak, leaning ouy cylinder. try this and let me know. James White White Automotive, ASE tech, 17 yrs exp.

Feb 06, 2013 | 1996 Chevrolet K1500

2 Answers

P305 code we have changed the spark plugs and wires we have replaced the fuel filter and had diagnostics done on the car and the mechanic says there is nothing wrong with the cyclinders


This is what all should be checked:
P0305 indicates the PCM has detected misfires on cylinder number five.
Here are six common problems that may cause OBD trouble code P0305:
  1. Fouled, cracked, worn or otherwise misfiring spark plug (Replaced)
  2. Bad ignition wire - burnt, cracked, carbon tracked wire or plug boot (Replaced)
  3. Defective ignition components - ignition module, ignition coil, distributor cap, etc..
  4. Vacuum leaks
  5. Clogged or otherwise defective fuel injector
  6. Internal mechanical engine fault, ie., low cylinder compression, bad valve, collapsed lifter, etc..
The aforementioned list covers the most common causes of P0305 in the order we feel is most likely to occur based on our past experiences. Certainly, each situation is different and there are other possible causes for cylinder misfires. Here are other causes we've seen (in no particular order).
  • Low fuel pressure
  • Leaking fuel pressure regulator
  • Poor fuel quality - water in gas tank
  • Uneven EGR flow caused by carbon build-up on engine with multiple EGR ports
  • loose or corroded fuel injector wiring
There seems to be a few things that have yet to be checked by your mechanic.
I know it is frustrating when the OBDII codes don't point you directly to the problem. To be hones this is something that I can not solve from here. However I hope that with the above information you can get your misfire detected code to go away after the real problem is discovered.

Kelly

Sep 26, 2011 | 1999 Toyota 4Runner

1 Answer

Code p305 help car runs good little rough on acceleration but runs smooth for the most part


P0305 Code - Cylinder #5 Misfire
A P0305 code means that the the car's computer has detected that one of the engine's cylinders is not firing properly. In this case it's cylinder #5.

Symptoms may include:
the engine may be harder to start
the engine may stumble / stumble, and/or hesitate
other symptoms may also be present

Causes: A code P0305 may mean that one or more of the following has happened:
Faulty spark plug or wire
Faulty coil (pack)
Faulty oxygen sensor(s)
Faulty fuel injector
Burned exhaust valve
Faulty catalytic converter(s)
Running out of fuel
Poor compression
Defective computer

Possible Solutions:
- If there are no symptoms, the simplest thing to do is to reset the code and see if it comes back.

- If there are symptoms such as the engine is stumbling or hesitating, check all wiring and connectors that lead to the cylinders (i.e. spark plugs). Depending on how long the ignition components have been in the car, it may be a good idea to replace them as part of your regular maintenance schedule. I would suggest spark plugs, spark plug wires, distributor cap, and rotor (if applicable). Otherwise, check the coils (a.k.a. coil packs). In some cases, the catalytic converter has gone bad. If you smell rotten eggs in the exhaust, your cat converter needs to be replaced. I've also heard in other cases the problems were faulty fuel injectors.


Test, check it and keep us updated.

Aug 07, 2011 | 2002 Toyota Camry

2 Answers

P0305 code, new plugs, wires, cap, rotor, coil, fuel filter and still getting p0305 code any good ideas?


means misfire in #5 cylinder. found this for you. hope this helps
Common Problems That Trigger the P0305
  • Worn out spark plugs, ignition wires, coil(s), distributor cap and rotor (when applicable)
  • Incorrect ignition timing
  • Vacuum leak(s)
  • Low or weak fuel pressure
  • Improperly functioning EGR system
  • Defective Mass Air Flow Sensor
  • Defective Crankshaft and/or Camshaft Sensor
  • Defective Throttle Position Sensor
  • Mechanical engine problems (i.e.-low compression, leaking head gasket(s), or valve problems
Common Misdiagnoses
  • Fuel Injectors
  • Oxygen Sensor(s)
  • Power Train/Drive Train problem

Jan 05, 2011 | 1999 Chevrolet Suburban

2 Answers

I have a 1996 crown vic i need to know these touble codes po305 po304


P0304 means that cylinder 4 has a misfire and P0305 is a cylinder 5 misfire. What this means is you may have bad spark plugs, or bad plug wires, or you may need to replace your distributor cap and rotor. I would start with plugs and wires.

Oct 21, 2010 | 1996 Ford Crown Victoria

2 Answers

Intermittant p0302,p0305 codes misfires


A code P0305 may mean that one or more of the following has happened:
· Faulty spark plug or wire
· Faulty coil (pack)
· Faulty oxygen sensor (s)
· Faulty fuel injector
· Burned exhaust valve
· Faulty catalytic converter(s)
· Running out of fuel
· Poor compression
· Defective computer

If there are symptoms such as the engine is stumbling or hesitating, check all wiring and connectors that lead to the cylinders (i.e. spark plugs). Depending on how long the ignition components have been in the car, it may be a good idea to replace them as part of your regular maintenance schedule. I would suggest spark plugs, spark plug wires , distributor cap, and rotor (if applicable). Otherwise, check the coils (a.k.a. coil packs). In some cases, the catalytic converter has gone bad, especially given you had water issues. If you smell rotten eggs in the exhaust, your cat converter needs to be replaced.
I've also heard in other cases the problems were faulty fuel injectors.

Nov 10, 2009 | 1996 Oldsmobile Cutlass Ciera

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