Question about 2005 Chevrolet Silverado

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My engine light is on and the code machine is saying multiple miss fire, and i have just had a recent tune up.

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Multiple misfire is determined by the O2 sensors. misfire can be the result of spark not reaching the cylinder from the coil (due to bad plugs/wires), or it can be the result of the coil not initiating the spark or not being told to initiate a spark by its inputs. if the tune up did include plugs and wires and was done without damaging any new components (broken plug during install, separated wire from connector inside boot, etc.), then perhaps the source of the misfire is in the primary ignition components (coil pack, crank sensor, ECM, etc.). Recommend wiggle each wire near the plug to ensure there is no broken plug or broken wire connector. This is more reliable if done while the engine is running, but know that if there is an arc somewhere in the secondary ignition it very well may shock your fingers (this is not dangerous, but better to be prepared than surprised by it)

Posted on Sep 29, 2009

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My 2001 Honda Odyssey is saying I have trouble codes p0108,p0122,p0740,p0780,p0300 what causes all these trouble codes what is the problem with it please help


Google the codes individually
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740,780 is from your trani
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Code says number one cylender miss fireing just did tune up still miss fireing


Depending on your vehicle is the coil pack good? If so with car running unplug the alternator and see if the engine smooths out, if so replace the alternator. The alternator can have a short inside causing a misfire code, if coil pack, wires, and plugs are good.

Feb 13, 2011 | Ford Mustang Cars & Trucks

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Check engine light is on and it reads Misfire on #2 cylinder. Also oxygen sensor bank2 sensor 1 and Bank 1 sensor 3 behind the converter. Engine running rough.


the engine miss fire can cause the other codes to set. you need to repair the miss fire and clear all codes after the miss is repaired then see if the 02 sensor codes return. the miss fire is probably a bad spark plug wire a good tune-up should take care of it ........HAVE A GREAT DAY

Jan 27, 2011 | 1996 Oldsmobile Bravada

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One of the engine cylinders is mis firing (did a code check). the check engine light initially flashes when first driving, then remains on -does not flash any longer) would that damage the catalytic...


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Dec 24, 2010 | 1990 Pontiac Grand Prix

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1996 corvette didn't pass emissions codes po117 and po300 i just put new engine n tune up what could be wrong now


p0300 is usually a random cylinder miss-fire code, and i think that p0117 is coolant temperature sensor? Try replacing the sensor, could also be the reason for the other code, as a malfunctioning coolant temp sensor will affect engine timing.

Dec 14, 2010 | Chevrolet Corvette Cars & Trucks

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Engine lights comes on checked code and po300 comes up


that's a multiple cylinder missfire code(random). Has it been a bit shaky recently? if you haven't performed a tune up recently, it's time to do so. replace plugs, wires, and in some cases, the distributor cap and rotor if equipped.

Feb 16, 2010 | 2003 Dodge Caravan

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98 camry engine light on w/misfires & system too lean


take sample of your fuel into clear plastic bottle from fuel line
is there any water present?
this can cause these codes and then not go on storing codes for other bank even though that bank will be missfiring also due to water & P0300 Random/Multiple Cylinder Misfire Detected being logged
check all connections to coils/leads & wiring connectors
due to miss fire codes for cyl 1,3,5 all on the same bank
also look and check for air leaks on that bank (hose knocked off or splithose)inlet manifold gasket,brake booster etc...
3 injectors being blocked slightly on same bank posible!!!
check wires and signal

was it running like this b4 tune up & repairs?
this is what codes are
P0170 Fuel Trim Malfunction (Bank 1)
P0300 Random/Multiple Cylinder Misfire Detected
P0301 Cylinder 1 Misfire Detected
P0303 Cylinder 3 Misfire Detected
P0305 Cylinder 5 Misfire Detected

the last code is for trans due to misfire/running lean on bank 1 probably a torque problem code
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1 Answer

Multiple random miss fire


Now change the distributor. Get one from salvage or e-bay. Did the timing belt jumped a tooth or is it new. Vitally

May 12, 2009 | 2000 Chevrolet Impala

1 Answer

Engine has miss-fire


First check spark plugs/wires/distributor cap (tune up). Also would be good idea to use fuel injector cleane and change fuel filter and O2 sensor.
Hope that helps
Good Luck

Mar 22, 2009 | 2003 Audi TT

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