Question about 2000 GMC Jimmy
When confronted with a P0442, many techs impulsively replace the cap, as it has been found to be responsible for a fair number of large-leak evap DTCs. Caps that are incorrectly installed following a fill-up also contribute to this problem. But as you know, vehicles with enhanced evaporative emissions systems, are very sensitive and will detect leaks that are much smaller than those resulting from a defective or loose cap. In fact, leaks as small as .040 in. can be detected.
Posted on Jul 05, 2008
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Posted on Jan 02, 2017
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