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p0300 help!!

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Old 06-29-2015, 01:04 PM
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Unhappy p0300 help!!

Ok so I've been searching this site for 2 weeks now looking for a solution to this code. I have a 2000 Chevy blazer 4x4. All I have done was a complete tune. I was going to do more but i noticed that every time I start my blazer (I have to jump it since it has a bad battery) it runs smooth. But when I give it throttle and it idles down it throws the code and idles around 1000rpm. Could this just be a bad computer? I don't want to fix everything it 'could' be and waste money. Can anyone help me out?
 
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Old 06-29-2015, 01:28 PM
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What brand of parts did you use for your tune up?

How did the old plugs look?

If you do not have the ability to do a live scan, watching the sensor values, you may need to bite the bullet and take it to someone that does and has the experience to properly diagnose the problem.
 
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Old 06-29-2015, 01:34 PM
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Originally Posted by swartlkk View Post
What brand of parts did you use for your tune up?

How did the old plugs look?

If you do not have the ability to do a live scan, watching the sensor values, you may need to bite the bullet and take it to someone that does and has the experience to properly diagnose the problem.
I learned from here only use ac delco so thats what i got and the spark plugs from 1 and 3 had fuel on them. And i have a scan tool that works on other cars but when i go to scan this the values are maxed saying my rpms is 16000(yes sixteen thousand..not 16 hundred)
 
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Old 06-29-2015, 01:39 PM
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Do you have the plug wires routed correctly? On the driver side, the posts on the distributor are 3-1-5, not 1-3-5.
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Old 06-29-2015, 01:42 PM
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Yes i have them plugged in the right spot. Also the misfire seems to go away after i rev it to 2000 rpm
 
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Old 06-29-2015, 01:43 PM
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I would test compression & leakdown on all 6 cylinders and compare. Sounds like you might have a problem between #1 & #3.

Did the old plugs from #1 & #3 look worse than the other 4?
 
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Old 06-29-2015, 01:51 PM
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Originally Posted by swartlkk View Post
I would test compression & leakdown on all 6 cylinders and compare. Sounds like you might have a problem between #1 & #3.

Did the old plugs from #1 & #3 look worse than the other 4?
From #1,3&5 they are black only 1&3 are wet and #2,4&6 has white/greenish dust on the area wher it would spark. And where can i find a forum on how to do a compression test
 
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Old 06-29-2015, 01:56 PM
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To run a compression test, you first need a compression test gauge (pressure gauge with the appropriate adapters to thread into the spark plug hole).

A leak down test is more complicated and requires a shop air supply.

You can find more details for both through Google as there is nothing about these tests that is specific to the Blazer.
 
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Old 03-19-2018, 09:05 PM
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ummmmmmmmmm is 1 not the driver side , TDC is always 1 first plug on the driver side.
 
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