Question about 2002 GMC Sierra 1500

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2002 gmc serra 4.3 v6 code p0300 random misfire .put in new plugs & wires & cap this did not work 64,000mi on motor. and now gas filter

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Check the oil,smell the oil,to see if there is a gas smell to it,if so,the injector spider,has a broken injector line.The intake will have to be removed to replace the injector.

Posted on Jul 08, 2010

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Posted on Jan 02, 2017

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2 Answers

What is the normal fuel pressure for a 2002 grand am v6?


Definition of Diagnostic Trouble Code P0300 Category: Powertrain Definition: Random/Multiple Cylinder Misfire Detected

Apr 22, 2017 | 2002 Pontiac Grand Am

1 Answer

Code p0316 also p0300 truck has no power


P0300 is a random misfire and P0316 is misfire at start-up.
If you have the V6, I would start by replacing the plugs and all the coils.
This is a little ******* the V6, since you have to remove the intake manifold, and the coils can be expensive. Coils are available on Ebay.
I've replaced all the coils on my 2002 Escape V6 after 100,000 miles. Typical V6 problem.

Generally, the issue could be the following from: http://www.obd-codes.com/p0300

A code P0300 may mean that one or more of the following has happened:

  • Faulty spark plugs or wires
  • Faulty coil (pack)
  • Faulty oxygen sensor(s)
  • Faulty fuel injector(s)
  • Burned exhaust valve
  • Faulty catalytic converter(s)
  • Stuck/blocked EGR valve / passages
  • Faulty camshaft position sensor
  • Defective computer

Sep 09, 2011 | 2004 Ford Escape

2 Answers

We put a tester on my 1999 blazer and it came up 1 code P0300???? gettin a seconed opion


p0300 is a random misfire, which usually indicates almost anything-generally a good tune up will fix it, like new wires, plugs, clean the throttle body, dist cap/rotor, check charging system, check fuel pressure, replace fuel filter...it is random (usually fuel) but a good going-over by a decent and honest mechanic will fix it.

Apr 21, 2011 | Chevrolet Blazer Cars & Trucks

1 Answer

I have a 2002 GMC Sierra 1500. 4.3 liter engine. I brought it to autozone and they put the gauge on it and got two codes P0140 and P0300. I had my distributor cap replaced, ignition rotor, plugs ,wires,...


Clean mass air flow sensor with a nonchlronated brake cleaner,install new air filter and check all vacuum lines for leaks then check for vacuum leak around or at intake manifold.Code P0140 is for mass air flow sensor code P0300 is a multiple misfire which more than likely is a vacuum leak possibly intake manifold gaskets leaking.

Apr 11, 2011 | 2002 GMC Sierra 1500

2 Answers

Cylinder 5 and im also getting p0507 idle is higher then expected. ive change plugs wire cap button cam sensor and distributor. but now its throwing the codes p0300 and p0507 it goes from p0300 to p0305...


po 300 is random/ multible cylinder misfire detected po507 idle system rpm high-- go to this site for the po507 meaning--www.obd-codes.com/p507 === please go to this site for the po300 code---- www.obd-codes.com/p0300

Random/Multiple Cylinder Misfire Detected have a good day !!

Feb 15, 2011 | 1997 GMC Sierra

1 Answer

99 Daewoo Lanos random misfire.


replace crankshaft senor, its bad, faulty. Check your O2 sensor. change fuel fuel filter and spark plugs and wires with new ones.

Oct 20, 2009 | 1999 Daewoo Nubira

1 Answer

Has a random misfire. Found trouble code P0300 when put on the scanner


look inside the disturbutor cap and see if there is white build up on the points inside the cap. if so change cap rotor plug wire and plug. go from there.

Aug 14, 2009 | 1997 GMC Jimmy

1 Answer

Engine Random Misfire code PO-300


P0300 is for random miss-fire, loose or defective gas-cap, water in the fuel, damaged vacuum line, clogged fuel and/or air filter, faulty plugs and/or wires, fuel injectors. These are more common reasons, there are others but this a good start.

May 15, 2009 | 2001 Mitsubishi Diamante

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