Question about 2001 Oldsmobile Aurora

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P0305 it says cylinder five misfire. i have changed the plugs, still comes up, i have switched the ignition coils, still same code, the plug boots are good. i dont not know what to do. i checked the fuel pressure regulator for wetness in the vacume line nothing there. i can only think maybe it is an injector? i also switched the spark plugs around to see if it was a plug issue no luck there.

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  • Oldsmobile Master
  • 1,452 Answers

If the injector is clogged it may cause it to run lean & misfire or the cam or crank sensor is causing a misfire. Have an emissions test, proper fuel pressure readings, live computer readings would give u a head start.

Posted on Aug 16, 2017

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6ya6ya

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Posted on Jan 02, 2017

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Anonymous

  • 321 Answers

SOURCE: 99 olds alero 2.4

I'm sure you have installed a fuel pressure gauge and monitored the fuel pressure while the problem is occurring?Another diagnostic tool which is easy to do,is while the problem is occurring,unplug one sensor at a time beginning with the Mass Air Flow first,.if it uses one.Many times,not always,depending on the sensor,if the sensor is taken out of the picture as far as what the PCM is seeing,like unplugging the MAF,the PCM will substitute the missing sensor output with a generic value that will allow the engine to at least run,and if unplugging for example the MAF,the engine idle speed returns to normal,you know you're onto the problem.You didn't mention if the engine ran ok other than the idle problem.As far as checking for vacuum leaks,i use something like brake cleaner or WD 40,more of a liquid,and it does sound like a vacuum leak.Plastic intake manifolds do develop nearly invisible cracks that open up more with heat.Revsisit the possibility.And as for the PCM,it is possible,but more likely a mechanical problem.Lastly,remove an O2 sensor or two before the catalytic convertor,run the engine and see if anything changes.Cheap way to verify the catalytic convertor is flowing and not restricting engine airflow,as i have seen bad cats cause misfire codes and strange problems.Good luck.

Posted on Dec 04, 2008

Anonymous

  • 1 Answer

SOURCE: intermittant p0302,p0305 codes misfires

1990 olds cutlass ciera misfire

Posted on Jan 15, 2010

Anonymous

  • 2 Answers

SOURCE: codes are reading cylinder misfire and replaced

does the check engine light come on b 4 or after

Posted on Jan 27, 2010

wilrichar661

  • 1 Answer

SOURCE: p0304 cylinder 4 misfire

2001 oldsmobile silhouette van misfire on cylinder 4

Posted on Apr 19, 2011

joshjay

joshjay

  • 1 Answer

SOURCE: 1991 Olds Cutlass Ciera 3.3 v6 would start, run a

jrtvett's "unplug one injector and start" troubleshooting procedure would work if one injector is bad. If more than one injector is bad, then not so sure.
Like you mentioned, one or more injector(s) can go bad and it causes the others to stop working as well. After our experience, I am convinced this observation (fault mode) is correct (see below). Its as if upon warmup the solenoid in the faulty injector shorts, resulting in short circuit of signals to all the other injectors.
We have a 1989 Olds Cutlass Ciera with the 2.8L V6 that recently had the same fault: At least one injector went bad after warmup, then engine refused to restart. All other possibilities were eliminated, including crank shaft sensor, ECM, ignition pack, idle start valve, bad gas, rail pressure, etc.
No Service Engine light illuminated, and there were no fault codes in the ECM computer.
The jrtvett procedure could not easily be utilized in our case because all the injector connectors are underneath the intake manifold and inaccessible.
My cousin is a Ford mechanic told me of an analysis procedure Ford uses to troubleshoot injector problems. They display rail pressure on a LCD or CRT monitor and can see pressure drop with each injector's opening. Unfortunately, if the car is not starting, then this test will not be of much use. The engine has to be idling or at least all of the solenoids in all of the injectors operational to use this test. If engine won't start, then its clear none of the injectors are opening as described above, then no fluctuations in rail pressure would be displayed.
The shop that was working on our car decided to replaced all of the injectors, and the engine now runs like new.
Due to inaccessibility of injectors and fact these injectors were inexpensive ($40-$50 each), it was wise just to replace all six. Grading old injectors is not exact science.

Posted on Jun 08, 2011

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My 2006 ford fusion sel v6 is having cylinder misfiring problems the codes it reads out are p0171 p0304 p0305 p0306 and p0300


p0171 is fuel injection system too lean - bank 1
possible causes
- Intake air leaks - Faulty front heated oxygen sensor - Ignition misfiring - Faulty fuel injectors - Exhaust gas leaks - Incorrect fuel pressure - Lack of fuel - Faulty Mass Air Flow (MAF) sensor - Incorrect Positive Crankcase Ventilation (PCV) hose connection
p0304 is cylinder 4 misfire detected.
possible causes
Faulty spark plug 4 - Clogged or faulty fuel injector 4 - Faulty ignition coil 4 - Fuel injector 4 harness is open or shorted - Fuel injector 4 circuit poor electrical connection - Ignition coil 4 harness is open or shorted - Ignition coil 4 circuit poor electrical connection - Insufficient cylinder 4 compression - Incorrect fuel pressure - Intake air leak
p0305 is same as above but cylinder 5.
p0306 is same as above but cylinder 6.
p0300 is random misfire detected
possible cause
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

Oct 31, 2016 | 2006 Ford Fusion SEL

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

What is order of troubleshoot for cylinder misfire P305?


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
What does this mean? What does this mean?
Tech notes
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"
What does this mean? What does this mean?
When is the code detected?
Engine Cylinder 5 is Misfiring.
Possible symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
- Lack/loss of power
- Hard start
- Engine hesitation
P0305 Jaguar Description

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.

Read more:
P0305 Jaguar Cylinder 5 Misfire Detected

May 06, 2015 | 2007 Jaguar X-Type 3.0 Sedan

1 Answer

P0305 trouble code


P0305 is a misfire code in cylinder 5. Not sure whether you have a v6 or a v8, but regardless, this car in particular goes through ignition coils pretty quickly. The best way that I have found to deal with a misfire code is to change all 8 ignition coils and spark plugs at the same time. Make sure that you use only Motorcraft coils as the PCM does not play well with after market coils. rockauto.com has them for around $50 per coil

Mar 17, 2014 | 2004 Lincoln LS

2 Answers

2008 Cadillac CTS returning P0303 after replacing spark plug and coil pack


Error Code: P0303
Description:
Cylinder 3 - Misfire Detected
Possible Cause:
Wiring harness, igniter and fuel injector connectors.
Ignition system. (Spark plugs gaps)
Fuel injector No. 3.
Fuel pressure.
Running out of fuel.
EVAP canister purge valve.
Evaporative emission system.
Low compression, cylinder No.3. (check valve clearance and throttle plate for excessive wear)
Engine control module (ECM).

Feb 27, 2014 | 2008 Cadillac Cts

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

3 Answers

My 2000 Ford Expedition Triton motor has a skip. It doesn't do it all the time. The code says #6 misfiring. Is this something we can do ourselves or do we need to take to a shop?


You obviously have access to a code scanner so there are some things you can rule out and possibly fix the concern. Number six cylinder on the Exdedition is on the drivers side of the engine, second cylinder from the front. To do a backyard diagnosis, you will need to clear the code. This is easily done by disconnecting the negative battery terminal for 5 minutes then reconnnecting (I'll explain why). Next, remove the ignition coil on the # six cylinder. It is located on top of the engine and has one connector going to it and one small bolt holding it down, and usually black in color. You are marking it so that you don't mix it up. Now remove the # five ignition coil and install it where number six was. Put the marked coil in the number five hole. Connect both connectors.

Now drive the vehicle and allow the engine lamp to come on or to skip (misfire) a few times. Scan the vehicle for codes. If the code changes to a P0305 or # five misfire, then you know the ignition coil is bad. Replace the marked coil, disconnect the battery again to clear the code, then drive the vehicle and verify the repair. Other concerns could be a spark plug, injector, base engine concern or wiring. Good luck, let me know if you need more help :o)
Coils are the most common cause of misfire, especially after rain.

Apr 16, 2011 | 2000 Ford Expedition

2 Answers

96 bmw 740il misfire


This is a pretty common problem. I would change your valve cover gaskets. They run around ~ 50 bucks. If they are bad it will leak oil into spark plug well and cause a misfire. Very known on the 740.. Also if tune was not anytime not too long ago id change spark plugs while you at it. Then clear the computer and if you still get misfire on 8 try changing the ignition coil which is right about the cylinder with cylinder ignition coil 5. clear the computer. if you get random misfire and misfire cyclinder 5 after then its your ignition coil. parts store runs around 100 bucks

Dec 22, 2008 | 2005 Hyundai Santa Fe

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