97 Blazer V6 4.3L P0303 code-something else is the problem. - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 10-03-2014, 10:09 PM   #1
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Default 97 Blazer V6 4.3L P0303 code-something else is the problem.

Yes P0303 = #3 cylinder running lean but first here are the basic conditions:
This is a Surefire reman engine with new secondary ignition. The problem started with the installation of the motor. The mechanica called and explained the injectors needed replacing.
I took it home and replaced the old poppet valves with a set of the new Delphi injectors. Same problem P0303.
I thought I had screwed up the installation and got another set of injectors. Same result P0303.
I don't know GM products so I am lost as to where the problem could be, a broken wire between the computer and injector plug?
A bad computer? Are there any other components likely to cause this condition?
Thanks for reading this.
Ubbm.

Last edited by Ubbm; 10-03-2014 at 10:11 PM.
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Old 10-03-2014, 10:31 PM   #2
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Did you check compression on cylinders 1,3, and 5, and compare? Did you check spark on that cylinder? Did you try swapping a spark plug with that cylinder and see if the problem moved?

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Old 10-04-2014, 01:15 PM   #3
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Cylinder running lean?

P0303 is a misfire on cylinder 3.

Switch the spark plug with #5. If the misfire doesn't move, switch plug wires around. Years ago, I did a tuneup on a 4.3 and immediately had a misfire on #1. Come to find out, brand new spark plug had a crack in it.
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Old 10-05-2014, 12:45 PM   #4
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Thanks for suggestions.
I replaced #3 spark plug with a new one and the problem remains.
I have replaced the injectors which is what the motor installer claimed was the problem. I think at this moment I should return the Blazer to the repair shop and have them diagnose the problem. I have paid them $1200.00 labor for the installation of the reman engine. I have $4500.00 in this replacement motor so far.
I am getting too old for this "stuff'!
I'll report what they find.
Thanks,
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Old 10-05-2014, 01:57 PM   #5
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Did you switch sparkplug wires yet?
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Old 10-06-2014, 08:27 AM   #6
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#3 injector wire to pcm could be broken. would have to be open
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Old 10-06-2014, 04:52 PM   #7
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Sounds like a compression test needs to be done.
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Old 02-07-2015, 12:41 PM   #8
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Here is the answer: Apologies for such a delay, life gets busy. The repair shop replaced the #3 injector and all is good!
Whether the previous injectors were bad or I screwed something up, we will never know.
Thanks for your help.
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