There's an old saying in engine tuning that when adjusting the mixture of your engine you can be too rich a bunch of times, but only too lean once. With that in mind, determining the air-fuel ratio ...
We earn commissions from purchases you make using links in our articles. Learn more. If your car experiences poor fuel economy, lacks power, feels sluggish, idles rough, or has an illuminated check ...
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Master fuel trim to diagnose engine issues
Fuel trim data is one of the most powerful yet underused tools in automotive diagnostics. By learning to interpret short-term and long-term fuel trim readings, technicians and DIYers can spot vacuum ...
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