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Posted on Jan 27, 2011
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I have a po 300 engine code random cylinder misfire i change cap rotor and wires problem still exists

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  • Posted on Jan 27, 2011
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PO300 - Random/Multiple Cylinder Misfire Detected

When a misfire occurs, engine speed will fluctuate. If the engine speed fluctuates enough to cause the crankshaft position (CKP) sensor (POS) signal to vary, Powertrain Control Module (PCM) or Electronic Control Module (ECM) can determine that a misfire is occurring.

Causes:
- Improper spark plug
- Insufficient compression
- Incorrect fuel pressure
- The injector circuit is open or shorted
- Fuel injectors may be faulty
- Intake air leak
- The ignition signal circuit is open or shorted

Solutions:
- Perform Injector Service
- Replace Spark Plugs
- Replace Injectors
- Replace Ignition Coils

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What does po 305 cylinder 4 misfire mean? Po 316 misfire on startup? po 300 random misfire? Po 305 Cylinder 5 misfire?
Hi Micaela:
I'd be looking for ignition problems like shorting out spark plug leads or a bad distributor cap. Try running it in a really dark place and see if you can see sparks around the plug wires.
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May 13, 2015 • 2004 Ford Explorer Sport Trac
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PO 171 and PO 300 CODE GMC ENVOY
the sensor to replace is the HO2S sensor which is different to an O2 sensor. (has a different function)
code p0300 is random/multiple misfires
as misfires are from the electrical components you did not pay attention to items like low fuel pressure and faulty injectors which also cause random misfires.
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Feb 21, 2015 • GMC Envoy Cars & Trucks
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Po 300 code
That's a random misfire. It could be bad plugs, wires, coils, intake gaskets and a whole lot of other things. You need to have that diagnosed by a mechanic. The cause of my po300 code was a bad intake gasket found by the random misfire of cylinders 1 and 2 so it was at the front of the vehicle the mechanic spayed something around the front of the intake and the rpm's increased. bad gasket sucking to much air into those cylinders and causing a false misfire. I say false cause it did fire the gasses produced where not right the computer did not like the extra air
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Jan 25, 2014 • 1999 GMC Sierra
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Po316, po 300, po301, po305 2004 ford freestar
These codes are making me lean towards the ignition coil pack.My stepson's 2001 Sable 3.0 v6 had one cylinder misfiring(5-code P0305),which shares a coil with cylinder 1(code P0301).I diagnosed it by trading wire 1 and 5 at the coil,and the code changed to P0301.You have codes for the two cylinders on the same coil,so this is most likely it.(these codes would also trigger P0300(Multiple Misfires Detected) and P0316(Misfire Detected First 1000 Revs)).
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Oct 14, 2012 • 2004 Ford Freestar
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He is showing a 300 code and he has changed plugs, wires, fuel injectors, intake gaskets, fuel pump, gas tank, gas cap, not sure what else to change
Year, make , model and engine size? have you tried to identify which cylinders are misfiring? Have you looked at EGR? If stuck open can cause multiple random cylinder misfires.
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Jun 26, 2012 • Chevrolet Cars & Trucks
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Po 300 po 302 po305 just cumup on the daughters ride
these indicate a misfire on cylinders 2 and 5 the code 300 is random misfire.does the car need a tune-up plug,wires, the fuel injection system need cleaning,also there could be a intake vacuum leak with the intake gasket leaking causing the misfire near these cylinders.
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Apr 10, 2011 • 2000 Chrysler Concorde
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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 !!

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Feb 15, 2011 • 1997 GMC Sierra
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P0300 code on a engine its says random multiple cylinder misfire ???? changed the plugs and plug wires
recheck the plugs and wires check for proper gap on plugs also check that wires not crossed and that wires are properly seated on cap and plug
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Nov 12, 2009 • 1998 Chevrolet Camaro
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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.
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May 15, 2009 • 2001 Mitsubishi Diamante
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2005 Taurus Program Codes PO 300 and PO 316
P0300 maens random multiple cylinder misfire.
When was the last time the car was tuned.
Check plugs and plug leads are O.K
also check that fuel cap is on tight.
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Oct 15, 2008 • 2005 Ford Taurus
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