![]() ![]() The idle is a bit rough long-term fuel trim is way negative but short-term is making up for it and the oxygen sensor trace looks normal. OK, there’s nothing obvious, so now it’s time for the scan tool and a test drive. Once you get snookered by something as simple as a split vacuum hose or a loose ground wire, you’ll start every diagnosis with a quick visual/touch inspection. Most techs will grab a scan tool right away, but some of us older guys are more likely to start by looking under the hood for something obvious, like a broken wire or severe neglect or (aha!) signs of a recent repair. It’s tough enough when the trouble codes indicate something vague like “random misfire” or “system too lean,” but it can be even worse when there are no codes at all, with only a driver’s complaint about stalling or sluggish performance. Sometimes the hardest part of chasing driveability problems is knowing where to start. ![]() He currently holds ASE Master Technician and L1 certifications and has participated in ASE test writing workshops. His began his writing career writing service manuals at Chilton Book Co. Jacques Gordon has worked in the automotive industry for 40 years as a service technician, lab technician, trainer and technical writer. ![]()
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