Tip & How-To about BMW 325

The Power of Balance.

A lot of people post us questions about misfiring motors and how they can be diagnosed. The simplest and fastest way to check a misfire is the "power balance" test. It takes a few minutes and can tell you a lot about what is going on in the motor. Here's how its done. With the motor idling, open the hood and listen to the engine for where the misfire is occurring, if you can't isolate the misfire, then remove the #1 spark plug wire. If the motor idles the same then this is the bad cylinder, If it idles worse then you need to repeat the sequence till you find it.

****WHEN REMOVING A SPARK PLUG WIRE WHEN THE MOTOR IS RUNNING HIGH VOLTAGE CURRENT IS RUNNING THROUGH THE WIRE! USE AN INSULATED PAIR OF PLIERS TO REMOVE THESE WHEN PREFORMING A POWER BALANCE TEST, AS ELECTRICAL SHOCK MAY OCCUR!***

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1 Answer

1998 Pontiac grand Prix gt has motor vibration when started replaced plugs, maf code is po300 what could this be


Melissa, P0300 Random Cylinder Misfire, could be caused by bad plug wires,bad /weak coil, Ign. module,clogged bad fuel injectors,etc. will probably have to take it to a good tech to diagnose and est. repair. Check the attached links more info,instruction and guides, Good luck
"I hope this helped you out, if so let me know by pressing the helpful button. Check out some of my other posts if you need more tips and info."
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Apr 24, 2016 | Pontiac Cars & Trucks

1 Answer

e 250 ford van 5.7 misfire problem


Is there a question

How about checking for codes
& diagnosing the cylinder misfires,
vacuum leaks & other possible causes?

Most Fords have failed ignition coils or
modules,lots on the internet to learn from
& you tube video

Sep 28, 2014 | Cars & Trucks

1 Answer

ford taurus p0300


Neither was the problem on a 2007 vehicle,still sort of new

You do need to change plugs every 3 years

I would change the Front Oxygen Sensors, if you have 100,000
miles on them---still not the misfire issue

The misfire is the ignition control module, if that is what you have,
since you mentioned plug wires,some motors have individual
ignition coils & they fail a lot on a ford

Those codes are of no use, their random misfires & misfire
on first 1,000 rpm when starting the motor

Have to diagnose each cylinder & any module issue

Whom ever did your work failed to do anything but replace
parts,no road test,no scanner data checking or code diagnoses

Don't go to the chain store or auto parts shops
Go to an old time local shop

Apr 02, 2014 | 2007 Ford Taurus

1 Answer

my toyota hilux 2.7 pickup 2001 model misfires solution


Check the ignition system for misfires
There is lots on the internet on how to
diagnose misfires & you can print the info
and take to the vehicle,dozens of sites
Ask the question using Google, also go to
You Tube Video

Jul 26, 2013 | Cars & Trucks

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