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p0300 code

still missing

p0300 code

Postby bear601 [OP] » Oct 18 2011, 12:59am

ok whats up everybopdy im new to this forum so lets see how it go's.
ive got a 2002 chevy silverado 5.3L
ok it all started with my wife leaving the map light on and draining the batt.
i took the batt out and recharged it put batt back in and then it started missing,
pulling a p0300 code and is missing on cylinders 1,3,and somtimes 5,6,7
since then ive changed the batt,and bank one sensor one 02 sensor,drained all the gas out and replaced the fuel filter and did a fuel pressure test on the fuel rail which held at a steady 50psi, sprayed a whole can of carb cleaner on top of intake manifold and vac lines with no results any ideas will be tried im lost at what it could be
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p0300 code

Postby RAFFY » Oct 18 2011, 2:57am

The code p0300 does refer to engine misfires have you tried changing the spark plug wires on those cylinders to make sure the wires are fine? If the misfire is still there with wires from the good cylinders try switching the boots or whatever your truck uses. Should be a pretty easy code to fix.
4.16.2014
Scottsdale305: Used to wear them. Always get caught under my heels and wreck the backs
RAFFY: lol he wears heels!!!^^^

4.18.2014
BILL RUINED ALL THE FUN THIS DAY :(
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p0300 code

Postby Jrluz14 » Oct 18 2011, 3:01am

It's the complete opposite. Misfires are by far the worst thing to chase on any vehicle. Start with checking all of you wire connections, especially around the battery.
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p0300 code

Postby RAFFY » Oct 18 2011, 3:14am

Jrluz14 wrote:It's the complete opposite. Misfires are by far the worst thing to chase on any vehicle. Start with checking all of you wire connections, especially around the battery.


From my experience usually a misfire is either a bad sensor, plug and/or wire. Once he trouble shoots a couple things he'll then be able to narrow it down to the cause no problem.
4.16.2014
Scottsdale305: Used to wear them. Always get caught under my heels and wreck the backs
RAFFY: lol he wears heels!!!^^^

4.18.2014
BILL RUINED ALL THE FUN THIS DAY :(
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Re: p0300 code

Postby country1911 » Oct 18 2011, 3:27am

The problem is, its a random misfire. If it was only one cylinder, it would be considerably easier.

I would start with fuses and wires, making sure everything was good and tight.
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Re: p0300 code

Postby bear601 [OP] » Oct 18 2011, 6:04am

wow i feel really dum my cyl 1,3 wires were arking out on my headers due to them melting time to order another set of performance wires
very simple fix thanks alot you guys
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Re: p0300 code

Postby RAFFY » Oct 18 2011, 10:52am

Ha ha no reason to feel dumb were here to help glad you got it all figured out. What set of performance wires did you go with? Also, if you haven't changed your spark plugs in a while this would be a great time to do so.
Last edited by EKinMN on Oct 20 2011, 12:44pm, edited 1 time in total.
Reason: Please do not quote the post above yours. It's redundant. Use the quick reply instead.
4.16.2014
Scottsdale305: Used to wear them. Always get caught under my heels and wreck the backs
RAFFY: lol he wears heels!!!^^^

4.18.2014
BILL RUINED ALL THE FUN THIS DAY :(
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p0300 code

Postby Jrluz14 » Oct 18 2011, 11:20am

Haha it happens. Run some MSD wires and get some protective sleeves for whatever plug wires hit. I have my stock wires with two sleeves on 4 and 6.
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Combustion on 5 pistons [L2]
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Re: p0300 code

Postby zTech71 » Feb 14 2012, 7:41pm

try and relearn the crank sensor can only be done with a scan tool. Alot of times the crank sensor will not throw a code. you may be suprised.
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Re: p0300 code

Postby zTech71 » Feb 14 2012, 7:43pm

sorry didn't read all the post glad you got it fixed.
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