Question about 2003 Chevrolet TrailBlazer
Computer said misfire on #3 i changed spark plugs now it says misfire on multiple
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
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
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
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
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
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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