Question about 1999 Ford F150 Regular Cab

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1999 F150 w/5.4L vin L. Showing DTC P0305 cyl 5 misfire. Have tried everything to fix this; new coil, new plug, new injector, new egr valve, new egr vacuum soleniod, new dpfe sensor, all new vacuum lines.... The truck only misses for a few mins at a time, maybe 4-5 minutes at a time. When it does miss, the exhaust smells terrible and when it is not missing the exhaust smells normal. Sometimes it will go several days without missing and then start back out of the blue. Can a semi-clogged converter cause this problem? Can a weak fuel pump cause a miss on one cylinder?

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  • Ford Master
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This truck has spark plug wiring. Have you REPLACED all spark plugs and wires with new? Have you cleaned the MAF sensor? don-ohio

Posted on Apr 26, 2017

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6ya6ya
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Posted on Jan 02, 2017

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SOURCE: 1991 ford f250 5.8l VIN H

In all the technical data I have access to Snap-on, Mac, AllDATA and most service manuals all tell you to start with a wiggle test and clean all grounds.
Wiggle test means wiggle the wires and connectors while te engine is running and see if there is a change in performance. I suggest unplugging the connectors one by one and doing a visual inspection on them, look for green corrosion rust oxydized connections etc, add a little bit of di-electric grease and plug it back in, for the grounds that are bolted on remove these but be careful not to break off the rusty ones then use 400 grit sandpaper and shine up the mating surfaces add some di-electric grease and re install. Before you start to clean the connectors and grounds remove the neg off the battery, it will reset the check engine light if left unplugged for 30 mins

Posted on Mar 23, 2009

juggernautxt
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SOURCE: 99 ford expedition 4.6 misses / egr? vacuum?

it's getting to much egr the egr has gone bad and needs replaced.
the diaphragm in the egr is leaking, and default position for air is defrost.so when you hit 3000 rpm you don't have enough vacuum.

Posted on Apr 30, 2009

  • 13 Answers

SOURCE: This 86 2.9 litre Bronco II has us stumped. My

When you say the fuel pressure jumps up and down and the engine stops,then you should look for wiring problems to fuel pumps.If you jump one fuel pump from battery and it runs o/k ,than you know you have a wiring problem from relay to pump.

Posted on Nov 07, 2009

66 chrgr
  • 1011 Answers

SOURCE: Getting a code of misfire on cylinder 2, Bank 1 and lean code

Higher compression usually only happens when extra oil is introduced in to the cylinder.Your rings seem good due to the good compression .If there is a worn valve guide in that cylinder this would allow oil to seep into the cylinder .Also allowing for extra rocker arm movement which could be your chirping noise and cause a rough idle.The lean code sounds like something different like the is still a vacuum leak.It sounds like you know cars well ! I hope this helps

Posted on Nov 10, 2009

  • 70 Answers

SOURCE: I have a 99 Windstar 3.8L Keep getting DTC PO401

Does the egr vavle open ? You will need to use a scanner to test the dpfe voltage when the egr valve is energized you should read around 3.5 4.00 volts. Also you could remove the vacume line from the egr valve and with the engine running you should see around 100 rpm drop in engine rpm at least this would indicate the egr valve is capable of flowing egr gases through the system to the cylinders.

Posted on May 30, 2010

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1 Answer

Misfire on #5 cyl


2005 Dodge Grand Caravan 3.8L engine misfire on cylinder 5.

answers.edmunds.com > Edmunds Answers
Aug 14, 2012 - MIL on; cylinder 5 misfire; most noticeable at idle in gear ... This could be caused by an EGR valve that is sticking partly open and not closing ...

OBD-II Trouble Code: P0305 Cylinder 5 Five Misfire Detected

www.obd-codes.com/p0305
A P0305 code means that the the car's computer has detected that one of the engine'scylinders is not firing properly. In this case it's cylinder #5.

ODB Code P0305- Misfire in #5 Cylinder - 2008 Dodge ...

repairpal.com > ... > Grand Caravan > 2008 Dodge Grand Caravan
Feb 22, 2011 - ... do something with a misfire in the #5 cylinder of my V6 4.0L engine. ... ODB Code P0305- Misfire in #5 Cylinder on 2008 Dodge Grand Caravan .... My2005 dodge grand caravan jerks when it shifts into gear what could it be.

My Dodge Grand Caravan has a Cylinder 5 Misfire,? ' Yahoo An


Dec 05, 2015 | 2005 Dodge Grand Caravan

1 Answer

2004 Sorento began with code P0305, cyl #5 misfire. Inspected and replaced plugs, wires, and coil pack on cyl #2. Repair shop told me cyl #5 injector bad so they replaced. Still has misfire.I suggeste


If you had code P0305, I don't know why they would have done anything to the #2 cylinder but if they have already replaced the plugs, wires and injector; here are a few more items to check:
1) Check connections from ECM. Look for any corrosions or bent/broken pins.
2) Check the fuel line pressure
3) Check the engine compression
4) And if the above are good, then you will probably have a defective ECM

Nov 28, 2014 | Cars & Trucks

1 Answer

Bmw po305 code fix


P0305 means misfire on number 5 cylinder, could be bad plug, ignition coil, injector, or wiring, or low compression , carry out a compression test if ok I would try a new coil on number 5 cyl

Feb 23, 2013 | BMW X3 Series Cars & Trucks

2 Answers

Hi my 2006 cadillac cts has error codes po 300 303 305 343 347 368 392 and 496 can u tell me what they are or a website to find out thank u


P0300 is multiple engine misfire detected
P0303 is misfire in cylinder 3
P0305 is misfire in cylinder 5
P0343 is camshaft position sensor A (bank 1)
P0347 is camshaft position sensor A (bank 2)
P0368 is camshaft position sensor B (bank 1)
P0392 is camshaft position sensor B (bank2)
P0496 is EVAP Canister Purge System High Purge Flow

Jan 28, 2011 | 2006 Cadillac CTS

1 Answer

Codes p0300 p0301 p0303 p0305 no driveability complaints


P0300 - Random/Multiple Cylinder Misfire Detected
Basically this means that the the car's computer has detected that not all of the engine's cylinders are firing properly.

A P0300 diagnostic code indicates a random or multiple misfire. If the last digit is a number other than zero, it corresponds to the cylinder number that is misfiring. A P0302 code, for example, would tell you cylinder number two is misfiring. Unfortunately, a P0300 doesn't tell you specifically which cylinder(s) is/are mis-firing, nor why.

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 P0300 may mean that one or more of the following has happened:
* Faulty spark plugs or wires
* Faulty coil (pack)
* Faulty oxygen sensor(s)
* Faulty fuel injector(s)
* Burned exhaust valve
* Faulty catalytic converter(s)
* Stuck/blocked EGR valve / passages
* Faulty camshaft position sensor
* 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.

Random misfires that jump around from one cylinder to another (read: P030x codes) also will set a P0300 code. The underlying cause is often a lean fuel condition, which may be due to a vacuum leak in the intake manifold or unmetered air getting past the airflow sensor, or an EGR valve that is stuck open.

Try this same solutionsa for each case, keep in mind that P0302 is missfire for #2 cyl, P0305 is misfire for #5 cyl and more.

Hope this helps (remember to rate this answer).

Jan 25, 2011 | 2002 Hyundai XG350

1 Answer

Crossfire misfire 4/5


DTC codes that will trigger P0304 Misfire Detected Cylinder #4 & P0305 Misfire Detected Cylinder #5.

Possible Causes:
- Improper spark plug at cylinder
- Insufficient compression at cylinder
- Incorrect fuel pressure
- The injector circuit is open or shorted at cylinder
- Fuel injector may be faulty

Possible Solutions:
- Perform Injector Service
- Replace Spark Plug
- Replace Injector
- Replace Ignition Coil

Jan 17, 2011 | Chrysler Crossfire Cars & Trucks

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

1 Answer

We have 3 codes, p1684,p0300,&p0305


P1684 Driver 5 Line 4 Battery disconnected last 50 starts. (not much info on this one)

P0300 Random/Multiple Cylinder Misfire Detected

Causes:
  • Faulty spark plugs or wires
  • Faulty coil (pack)
  • Faulty oxygen sensor(s)
  • Faulty fuel injector(s)
  • Burned exhaust valve
  • Faulty catalytic converter(s)
  • Stuck/blocked EGR valve / passages
  • Faulty camshaft position sensor
  • Defective computer

P0305 Cylinder #5 Misfire Detected

Causes are the same as P0300.

Jan 03, 2011 | 2002 Chrysler Town & Country

1 Answer

P0303 and P1300 together (Cyl. 3 Misfire)


CODE P1300 IS MISFIRE DETECTED FUEL PROBLEM. WHICH MEAN 3 FUEL INJECTOR IS CLOGGED UP.HAVE FUEL INJECTORS CLEAN AND CHANGE FUEL FILTER.

Jul 24, 2010 | 1999 Audi A4

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