01 z06 p0300 misfire code
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Intermediate
Joined: Jul 2024
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01 z06 p0300 misfire code
Tldr: regasketed all the intake stuff, replaced and gapped spark plugs to .040, replaced maf sensor, replaced map sensor, cleaned intake manifold filters, still misfiring, what should I check or change now.
Long story, car was basically camping itself due to a terrible vacuum leak so changed the intake manifold gaskets, still misfiring so I changed the maf, still persistent so I changed the map sensor, nothing there so I changed and gapped the spark plugs and am still getting the p0300 random or multiple misfire code, car runs great after 2500 rpm but before that its terrible, what should I do now?
Long story, car was basically camping itself due to a terrible vacuum leak so changed the intake manifold gaskets, still misfiring so I changed the maf, still persistent so I changed the map sensor, nothing there so I changed and gapped the spark plugs and am still getting the p0300 random or multiple misfire code, car runs great after 2500 rpm but before that its terrible, what should I do now?
Tech Contributor
Joined: Jan 2007
Posts: 19,461
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From: Dyer, IN
Tldr: regasketed all the intake stuff, replaced and gapped spark plugs to .040, replaced maf sensor, replaced map sensor, cleaned intake manifold filters, still misfiring, what should I check or change now.
Long story, car was basically camping itself due to a terrible vacuum leak so changed the intake manifold gaskets, still misfiring so I changed the maf, still persistent so I changed the map sensor, nothing there so I changed and gapped the spark plugs and am still getting the p0300 random or multiple misfire code, car runs great after 2500 rpm but before that its terrible, what should I do now?
Long story, car was basically camping itself due to a terrible vacuum leak so changed the intake manifold gaskets, still misfiring so I changed the maf, still persistent so I changed the map sensor, nothing there so I changed and gapped the spark plugs and am still getting the p0300 random or multiple misfire code, car runs great after 2500 rpm but before that its terrible, what should I do now?
Moderator, Tech Contributor
Joined: Sep 2013
Posts: 15,600
Likes: 4,060
From: Cape Coral, Florida
Why are you changing a MAF and MAP sensor for a misfire ??...if you don't have a factory level or equivalent aftermarket scan and some advanced diagnostic equipment you will have little success...find a diagnostic shop in your area and take the car there....don't waste any more money !!
Thread Starter
Intermediate
Joined: Jul 2024
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I apologize if meant to type camming, i knew it was a vacuum leak because i smoke tested the system showing a massive intake manifold leak, then i fixed it and it eliminated the vacuum leak but I'm still misfiring
Thread Starter
Intermediate
Joined: Jul 2024
Posts: 42
Likes: 0
Why are you changing a MAF and MAP sensor for a misfire ??...if you don't have a factory level or equivalent aftermarket scan and some advanced diagnostic equipment you will have little success...find a diagnostic shop in your area and take the car there....don't waste any more money !!
