Question about 2004 Nissan Quest

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Fixing code p0300

Van running rough

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Code p0300 refers to random/multiple misfires detected===causes --spark plugs-- HT leads --injectors --coils--low compression--- ECM
While it is common to jump on the plugs ht leads band wagon it is also very possible that the injectors are not working properly because of insufficient fuel pressure . Have a fuel manifold pressure test done to check pump/regulator / filter problems first

Posted on Mar 20, 2014

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