Auto Service Professional

FEB 2016

Magazine for the auto service professional

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sense, but after putting the car up on the hoist and removing the wheel and inner fender the actual issue was revealed. The plastic vacuum supply pipe to operate the EVAP leak detection pump was damaged, it was chewed through by something. The car did have a vacuum leakā€¦ it just wasn't in the engine compartment. After repairing the chewed line and clearing the codes, both the additive and multiplicative were good at 0% and 0%, and after an extended city road test (lots of stop and go) with no CEL light the issue was fxed and the vehicle returned to the customer. 2009 Ford F-150 Another memorable diagnostic was on a 2009 Ford F-150 with 176,000 miles and a 5.4 V8 Triton engine. The complaint: CEL is on, sometimes the CEL will fash and it had lacked power under load and when driving hard at highway speeds. These issues had been ongoing for almost nine months and it always had the same code: P0302. Ignition coils, plugs, and even an injec- tor had been changed over a nine-month period, but the problem always came back and with the same P0302 code. The original tech was convinced that the truck needed a timing chain or cam phaser because of the mileage and the fact the engine was noisy. I was asked to get involved and help solve the problem. I wasn't so sure about a cam timing or phaser concern that was expressed by the previous tech. It had never set a cam code or had any other misfre codes on the same bank, something I would expect if there was a cam timing or phasing issue. I took the truck for a road test to verify the complaint and it defnitely had a power concern, the CEL did fash and you could feel the truck missing. If you continued accelerating hard, the truck actually started to slow down. The Tech Bench Circle 119 on Reader Service Card

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