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2000 5.3 1500 - P0300 Random Misfire

2000 5.3 1500 - P0300 Random Misfire

Postby GM-Man [OP] » Mar 31 2013, 7:12pm

Hey, I have a 2000 GMC Sierra 5.3l V8 with 161,000 miles (260,000kms) and It has a P0300 Random Misfire code. The truck runs perfect around town and on the highway but the misfire is relative to RPM. If i hold the revs at 1900rpm or more it misfires and the SES light flashes. So on the highway at about 70mph or over it will miss. around town it does not unless i put the shifter into 2nd and let the RPMS climb. The Truck has Had a FULL Tune up. The only thing done besides a Tune up was a new fuel pump installed last year. Has anyone encouterd this issue!!?? Maybe the Intake?
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Related Topics  random misfire   2005 silverado misfire, p0131 , p0300 , p0171 help please   Poor running, bad mileage and now a random misfire, too!   Clogged Cat or Bad 02 Sensor? Random Misfire...   random multiple misfire soo bad you can feel it   misfire code 2000 gmc sierra 5.3   P0300 HELP   In need of help with a p0300   P0300   P0300 code   p0300 diagnosis   5.3 P0300 Code   P0300 diagnosis help   P0300,p0171,174 
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Re: 2000 5.3 1500 - P0300 Random Misfire

Postby Blizzard » Mar 31 2013, 8:21pm

could be multiple things plugs wires mas intake maniflod 02sensor i had an 03 avalanche 5.3 l vortec it had the same issue it turned out to be intake manifold gasket. do a leak test and check compressinon of each cylinder
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Re: 2000 5.3 1500 - P0300 Random Misfire

Postby ASTE25 » Mar 31 2013, 8:31pm

It could be a bad coil or a vacuume leak. Both are fairly common problems. Since it is a random misfire I would lean towards a vecuum leak. The intake gaskets are pretty common to leak.
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Re: 2000 5.3 1500 - P0300 Random Misfire

Postby Mikez94 » Mar 31 2013, 8:40pm

+1 on the intake gasket. i had the same problem. changed all my plugs and wires just for service and didnt help. i then tested all my coils and they were good. tested the injectors, all good. so since the intake gasket is a very common problem with these motors, that's what i will be changing next.
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Re: 2000 5.3 1500 - P0300 Random Misfire

Postby GM-Man [OP] » Apr 01 2013, 1:26am

Thanks! Ill start looking into coils and the intake....whats the best way to check the intake gasket? Spraying the base with brake cleaner I'm assuming?
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Re: 2000 5.3 1500 - P0300 Random Misfire

Postby Blizzard » Apr 01 2013, 1:45am

Ya, I used carb cleaner
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Re: 2000 5.3 1500 - P0300 Random Misfire

Postby Mikez94 » Apr 01 2013, 4:08am

yup. or a starting fluid will do the trick
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Re: 2000 5.3 1500 - P0300 Random Misfire

Postby PR_Rado » Apr 01 2013, 5:21am

I had the same problem along with two other codes, and it led to an O2 sensor. You've got it right by checking your intake gasket by spraying it down as I did that test as well. My intake is good....... For now.
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Re: 2000 5.3 1500 - P0300 Random Misfire

Postby jayhawkZsevenone » Apr 01 2013, 12:21pm

Just had the same thing happen a few days ago - getting a P0300 and P0332 (Misfires / Knock Sensor II Low Input)...so I'm going to get to replace that mother and see if it takes care of the P0300 - this may be the same issue you are looking at?
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Re: 2000 5.3 1500 - P0300 Random Misfire

Postby ffTom5 » Apr 01 2013, 3:21pm

So I had this problem on thursday and spent the whole weekend figuring it out! Check both banks of you spark plugs and see if one bank is running richer or leaner than the other, ie blacker or whiter (my bank 1 was running VERY rich causing the P0300 code). Also you can swap your two upstream O2 sensors with eachother, and see if you start getting a bank 2 random misfire code if you are hesitant to blow $100 on diagnostics :P
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