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car wont start with p0300 code
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firewolf
New User
Jan 14, 2020, 1:20 PM
Post #1 of 4
(2778 views)
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car wont start with p0300 code
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I have a 2004 chevy blazer 4x4 was running good last night and will not start today giving a p0300 code. Recently gave a full tune up and repaired a leak in the fuel line. What would the most likley cause of the be and the simplest way to repair it?
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Hammer Time
Ultimate Carjunky
/ Moderator
Jan 14, 2020, 2:45 PM
Post #2 of 4
(2772 views)
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Re: car wont start with p0300 code
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All "crank, no start" conditions are approached in the same way. Every engine requires certain functions to be able to run. Some of these functions rely on specific components to work and some components are part of more than one function so it is important to see the whole picture to be able to conclude anything about what may have failed. Also, these functions can ONLY be tested during the failure. Any other time and they will simply test good because the problem isn't present at the moment.
If you approach this in any other way, you are merely guessing and that only serves to replace unnecessary parts and wastes money.
Every engine requires spark, fuel and compression to run. That's what we have to look for.
These are the basics that need to be tested and will give us the info required to isolate a cause.
1) Test for spark at the plug end of the wire using a spark tester. If none found, check for power supply on the + terminal of the coil with the key on.
2) Test for injector pulse using a small bulb called a noid light. If none found, check for power supply at one side of the injector with the key on.
3) Use a fuel pressure gauge to test for correct fuel pressure, also noticing if the pressure holds when key is shut off.
4) If all of these things check good, then you would need to do a complete compression test.
Once you have determined which of these functions has dropped out,
you will know which system is having the problem.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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firewolf
New User
Jan 16, 2020, 3:02 PM
Post #3 of 4
(2706 views)
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Re: car wont start with p0300 code
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I just found out what the issue was a bad O2 sensor replaced it and started up immediately
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Hammer Time
Ultimate Carjunky
/ Moderator
Jan 16, 2020, 3:05 PM
Post #4 of 4
(2702 views)
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Re: car wont start with p0300 code
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That's pretty unusual for an 0/2 sensor to have that much effect but if it worked, great.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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