No Code Misfire Diagnostic Tips Training Video - The Trainer Series
Duration: 10 minutes and 42 seconds
"The car isn't running quite right. It feels a little rough when I'm stopped". Not an uncommon customer complaint, right? Your service advisor brings you the ticket and the keys and you hop in the car to bring it inside.
Unfortunately for you, the car appears to run just fine as you let it sit at an idle in the lot. But Lady Luck smiles down on you, and the Malfunction Indicator Lamp (MIL) is on. You find a P0300 (Random Misfire) code stored in the Engine Control Module's (ECM's) memory. You also notice the car has some miles on it, and if you're like many of us, you're first instinct is that the car probably needs a "tune up". You pull a plug after you have it in your bay and see that it is worn and seems to have been in there for awhile, so you recommend plugs and wires (just to be on the safe side, right?) and proceed to the next job on your hook.
The parts arrive later that afternoon; you install them without any problem and return the car to the customer. Three days later, they're back and they're upset. The car is running the same as it did before.
This repair was doomed from the start, wasn't it? Assumptions were made, no testing was done (unless you count pulling the plug) and the repair was never verified. How many potential causes for this kind of complaint are there, and how do you narrow all of them down to the ONE that is the culprit?
Isolating the cause of a random or cylinder-specific misfire need not be a fault solved by "seat of the pants" troubleshooting. Following a logical order, applying a few simple techniques and using a little of what God gave you can lead you to a successful repair the first time. And that's the topic of this month's edition of "The Trainer".
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