How do you change the ingnition coil for a 2003 chevy trailblazer
Intermittent vibration from engine when idling. sometinmes hardly noticeable better when warm. Service engine light did show bad O2 sensor which was replaced. some improvement but still there. My mechanic also checked motor mounts which were ok. could it be the ignition coils ? would fuel injector cleaner help.
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oh,, we'll need some more information to be able to help, The thing is you didnt specify what vibrates for example when you start and you have vibrations while idiling, while in drive and the engine kicks back rough when changing gears more than likely its and engine mount thats bad. if its vibrating while idling its the fuel rpm ration (idling screw that needs adjusted or the MAP or air sensor if its fuel injected).. If its vibrating while the ac is turned on, check the ac step-up solenoid (the switch that increases the idling speed to match the ac's needed power.) we'll love to help or point you in the right direction but we'll need some more information. Describe whats happening for us , because we cant be there in person to actually experience it our selves. If you have a vid of the engine while vibrating etc all of that will be beneficial.
check your timing, fuel filters, check your points, or spark plugs is your rotor cap where it's suppose to be and is it good? i've always disconnected the battery and it seems to reprogram it's self. see if that works
Take the plastic resonator off the top of the engine, along with the aircleaner and ducting.
There you'll see 6 coils, each has 2 screws, do one at a time so they don't get mixed up. After the 2 screws are off, pull the coil straight up and out. There you'll see the plugs. I'd suggest using A/C Delco 41-103's as these engines love these and will idle better than most other brands. Hardest one to get to is the cylinder next to the fire wall because of clearance, but with some extensions and elbows, it's doable. When replacing the coil onto the new spark plugs, make sure you listen, or feel for a little click. If this is not felt or heard, it may not be on correctly. Many people have made this error, and your engine will not get spark to that cyclinder until corrected.
Very first one in the front of the engine. Cheapest way to fix this is to replace your spark plugs first. Use AC Delco 41-103, a little more than off brands, but will idle better than any other plug. If this doesn't work, replace the coil pack on cylinder 1. One of these will fix the problem. Also, check the wires that coil plugs into, if all else fails.
try changing the air filter ,i had a problem ,at ilde in drive my trailblazer would stall, changed the air filter now it's not stalling and got my power back ,there is a secondary air pump that i have to change ,
not sure were it is ? still not running perfect but it's running better .and my service light is on too.
i got it put on scope ,it's the pump .
not sure if this helps ,but i'm start to run in to problems too,i have a 2004 trailblazer.
i like to do fix things myself ,i hope i can.it's the cost if you know what i mean.