To confirm the leak, rev the engine to 2,500 rpm and hold. If the total correction is greater than plus 20% at idle, it probably indicates a vacuum leak that is making the fuel mixture run lean. With the engine warm and idling, add the long-term and short-term fuel trim numbers together. To check for a possible vacuum leak, use your scan tool to look at long-term fuel trim (LONGFT) and short-term fuel trim (SHRTFT). Ford says not to replace the oxygen sensor, MAF sensor or PCM because the cause may only be a vacuum leak or an incorrect sized PCV valve that flows too much air. The codes may indicate a lean fuel condition or a lack of heated oxygen sensor (HEGO) switching. TSB 04-17-4: MIL Lamp On, Lean DTCs – 2000-’02 Escort and Contour If you find any lean DTCs on one of these vehicles, Ford says the cause may be an engine vacuum leak, possibly around the PCV valve or in the PCV vacuum plumbing. I would recommend looking up the original TSBs to get the specifics. We don’t have the space here to reprint them in their entirety, so I will summarize what I found. Technical Service Bulletins While researching service opportunities on these engines, I found a variety of engine-related technical service bulletins listed on the ALLDATA website. If the tensioner and/or idler pulley bearings are loose or making noise, these parts must be replaced. Replacing the belt tensioner and idler pulleys with new ones is also a good idea, especially if the engine has more than 100,000 miles on the original pulleys. Replacing the water pump now can save your customer the labor cost of having to replace the pump later should it start to leak. It’s always a good idea to inspect the water pump when replacing a belt, and to recommend a new pump if the old one shows any sign of leakage or has more than 60,000 to 100,000 miles on it. ![]() ![]() On the 2.0L engine in 1998-2000 Contour, Escort ZX2, 2000 Focus, 1998-2000 Mercury Mystique and 1999-2000 Mercury Cougar, you’ll need a special camshaft alignment tool (see Ford TSB 99-25-4 for details on how to adjust the belt tension on these engines). The timing belt replacement procedures on most of these engines is pretty much the same as any other overhead cam engine. The interference applications include all of the older 1.6L, 1.8L and 1.9L engines in Escort and EXP, the 2.0L and 2.2L engines in Probe, and the 2.0L DOHC engines (VIN 3 and 5) in Focus.
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