As described by a written note left in their vehicle, the symptoms included “drives rough — jumpy — all the time, worse when wet.” They went on to describe them further by writing “does sometimes cut out when stopped. Not running on all cylinders. Spark plugs replaced 2 months ago — problem is worse.”
Many OEMs are still using the MAF (Mass Airflow) sensor as their primary means of measuring the air entering the engine. Knowing how it does its job makes it easier to know when it isn’t doing its job.
Have you ever heard the saying "Fool me once, shame on you. Fool me twice, shame on me?" or "Sometimes I'm my own worst enemy?" I had reason recently to have to use each saying while working on a 2004 Cadillac CTS (DM).
This Ford pickup had been around from shop to shop, even making appearances at a local dealership. The initial complaint seemed simple enough: no start, no communication and no odometer. Then why did the dealer technician toss his hands up in surrender after a month and a half without a solution? It's all about a testing method we've preached about before - voltage drop!
The current clamp is used to measure the electron current in one wire at a time, the preferred method, but it can also be used to measure more than one wire at a time provided the direction of electron current in each wire is known.
Diesel engine oil has been taken to a higher level of performance with the development of new American Petroleum Institute (API) specifications known as API CK-4 and FA-4, which were officially released for licensing on Dec. 1, 2016.
We use wiring diagrams in many of our diagnostics, but if we are not careful, they can sometimes lead us to make decisions that are not accurate, which can lead to wasted diagnostic time, unnecessary parts costs for the replacing parts that are not defective, and sometimes even missing a simple repair.
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