 | Subject: Code P0300 - '96 Chevy S10 P/U Posted By: Jeff MatthewsDate: 5/25/2009 11:08:00 AM
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Any help will be greatly appreciated.
1996 Chevy S10 P/U, 4WD, 4.3L SFI. All stock. Throwing P0300, Random misfires code. Checked/replaced the following:
Distrib Cap & rotor
Plugs & wires
TPS was checked and appears to be acting correctly. Voltage checks and increases with throttle changes.
EGR was replaced with new one.
Fuel filter changed.
Vac lines have been mostly replaced over the past year and all that I can check have been replaced.
Injector cleaner was run through tank of gas.
MAP sensor was in BAD shape, now replaced.
Interesting behavior: Engine idles fine, but when under moderate acceleration, engine would run rough, stumble and act like a cylinder mis-fire, under hard acceleration there was no stumble or miss. When MAP sensor was being checked, I noticed that while the MAP sensor was unplugged the roughness under moderate acceleration disappeared. Truck appears to run fine without MAP sensor plugged in. When MAP sensor is plugged in, the rough running comes back. I am at my wits end with this, so any help will be greatly appreciated!
I have cleared the code both with and without the MAP sensor connected and it still throws P0300.
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| Subject: Code P0300 - '96 Chevy S10 P/U Posted By: Jeff MatthewsDate: 5/25/2009 7:40:00 PM
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Update:
Discovered that my "helper" didn't tighten one of the sparkplugs, so the cylinder was losing compression. Upon tightening up the plug (and verifying the other 5), the rough running problem went away.
But NOW, I have code P0108, Manifold Absolute Pressure (MAP) Sensor Circuit High Voltage.
The MAP sensor is brand new, so I am not sure what the problem is now. Again, any help will be greatly appreciated.
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| Subject: Code P0300 - '96 Chevy S10 P/U Posted By: George AcevedoDate: 5/30/2009 7:13:00 AM
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did you make sure the battery was disconnected when you replaced the map sensor???
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| Subject: Code P0300 - '96 Chevy S10 P/U Posted By: Jeff MatthewsDate: 5/30/2009 11:20:00 AM
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Problem Solved! It turns out the ECC/PCM/ECM itself was bad. It is quite possible that I never really had a problem other than a bad ECC in the first place. Wish I could have figured that out before I spent another $300 in other parts. Oh well...
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Date: 7/23/2010 11:06:00 PM
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