Question about 2003 Chevrolet TrailBlazer

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I changed the spark plugs in my 2003 chevrolet trailblazer and its still saying mulitiple misfire

Computer said misfire on #3 i changed spark plugs now it says misfire on multiple

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  • Chevrolet Master
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Hi Julie, i believe the problem on your vehicle will be from the individual ignition coils which fir ontop of each of the spark plugs. Regards John

Posted on Feb 18, 2012

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Posted on Jan 02, 2017

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SOURCE: I have a misfire in cylinder #2 on a 2002

if you do not have a vacuum leak these are know for clogging injectors. They are buried and require a couple hours labor just to access and replace it. Or you can have an injector service performed by a shop. It'l run you 100 bucks give or take and doesnt always fix it. Or you can run some additive strong in the fuel tank and hope for the best. Or if your strapped and have plenty of time you can swap # 2 injector with 3 or so and see if the code follows. This is alot of work but it will rule out an intake gasket issue possibly.

Posted on Nov 18, 2009

  • 44 Answers

SOURCE: chevrolet trailblazer 2006 engine spark plugs

Platinum (or more precisely-AC Delo Iridium) spark plugs. The six spark plugs are directly under each of the six coils on top of the camshaft cover. The air intake needs to be removed, then each of the 10mm bolts for the individual coils. The coils can then be removed and the spark plugs accessed.

Posted on Oct 02, 2009

  • 335 Answers

SOURCE: replaced the spark plugs in a 2003 chevrolet trail...

Hello. the most common reason for this is a dirty throttle body. try cleaning the throttle body out with some throttle body cleaner

Posted on Jun 19, 2010

ryanlutton
  • 1150 Answers

SOURCE: 2003 Chevrolet Trailblazer 4.2L I6

With a service engine light blinking...don't drive it.

When replacing the spark plugs, double check that the boots on the coils are installed correctly. Check these again, and make sure to either listen for or feel a little click which tells you it's properly seated on the top of the spark plug. This is a common thing, happens all the time to people with TB's and Envoys. I've even done this myself.

In case you didn't know, # 1 cylinder is up front near the fan, then it runs in order to #6 at the firewall. Possibility....(don't take this as doubting you), maybe the wrong coil was replaced and one or more coil boots weren't set properly? Some things to check anyway.

Posted on Mar 25, 2011

  • 101 Answers

SOURCE: I changed the plugs and

if its a multiple missfire then i would suspect your fuel pressure is dropping or your regulator has failed and is sucking too much fuel causing the computer to overcompensate, these engines are also known for intake leaks

Posted on Mar 28, 2011

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try replacing or cleaning the injectors
when misfiring moves around it is seldom the coils , plugs and any thing else connected to spark but dirty fuel, low fuel pressure and dirty injectors or injector control
use a quality injector cleaner for a few tankfills

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What code P0301 on chevy trailblazer 2003


cylinder #1 misfire, could be the spark plug, the cables or the coils, did you do a tune up to your car lately? or a fuel injector is failing, go for the plugs first and cables, some times is a process of elimination, Thanks

Nov 06, 2011 | 2003 Chevrolet TrailBlazer

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I changed the plugs and wires on my 2003 trailblazer. I gapped the spark plugs @ .040 and checked all of the connections. Now my engine skips. It gave a 0300 code ( multiple cylinder misfire). Any...


if its a multiple missfire then i would suspect your fuel pressure is dropping or your regulator has failed and is sucking too much fuel causing the computer to overcompensate, these engines are also known for intake leaks

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5th cylinder misfire 2002 trailblazer. Spark plugs changed and continues to sound rough


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Mar 12, 2011 | 2002 Chevrolet TrailBlazer

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Spark plugs number 3 is misfire


change whit other and see if its the spark plug or the electricity cable.

Feb 15, 2011 | 2002 Chevrolet TrailBlazer

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I replaced all the spark plugs and cyld 2 that was maken miss firer and now it says muti misfirer


Spark plugs never fail to fire,nor are they, seldom your misfire problem
Individual Coils,Coil Packs,Ignition Modules and vacuum leaks are.

Nov 24, 2010 | 2002 Chevrolet TrailBlazer

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Changing spark plugs in 2003 chevy trailblazer


CHANGING SPARK PLUGS IN TRAIL BLAZER. YOU NEED TO REMOVE AIR INTAKE RESONATOR AND IGNITION COILS.YOU NEED LONG 3/8 EXTENSION - SPARK PLUG SOCKET - 3/8 RATCHET WRENCH. NEED SPARK PLUG GAUGE AND A TORQUE WRENCH.YOU CAN GET BY WITH OUT ONE LONG AS YOU DONT OVER TIGHTEN PLUGS AND STRIP OUT ALUMINUM THREADS.

Jun 26, 2010 | 2003 Chevrolet TrailBlazer

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I have a 2002 TrailBlazer with the straight 6,diognostic check said #3 cylinder was dead or misfiring, also map sensor showed up. #3 cylinder was misfiring, so to test the coil pack I swapped #3 coil pack...


did you replace only one spark plug? that can cause issues because of differences in resistances between cylinders. also, did the map code stay off after replacing
?

Feb 28, 2010 | 2002 Chevrolet TrailBlazer

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