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SportTrac Discussion
General Sport Trac Discussion
Any GM Mechanics around ???
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<blockquote data-quote="scott degroot" data-source="post: 966339" data-attributes="member: 66039"><p>On a cold start you should hear the air pump come on for about 45 seconds, if it doesn't than you need to go after that first and the most likely casue is typically a bad air pump.. If the air pump comes on your problem is probably in the electronic check valve on the right side of the engine where the air goes into the engine.. FWIW it's worth the pcm looks for the O2 sensor voltage to be driven low while the air pump is commanded on to determine if the system is working properly or not.</p></blockquote><p></p>
[QUOTE="scott degroot, post: 966339, member: 66039"] On a cold start you should hear the air pump come on for about 45 seconds, if it doesn't than you need to go after that first and the most likely casue is typically a bad air pump.. If the air pump comes on your problem is probably in the electronic check valve on the right side of the engine where the air goes into the engine.. FWIW it's worth the pcm looks for the O2 sensor voltage to be driven low while the air pump is commanded on to determine if the system is working properly or not. [/QUOTE]
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SportTrac Discussion
General Sport Trac Discussion
Any GM Mechanics around ???
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