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Posted: 9/4/2010 5:53:57 AM EDT
[Last Edit: 9/4/2010 5:55:08 AM EDT by builttoughf250]
I had a coil go out on my 2005 Chevy Impala 3.4 liter a month or two back. scanner has said "cylinder 3 misfire" both times.

it went out again yesterday. i put a new one in. this time, the check engine light didnt go off. i unplugged the battery for a couple minutes and it didnt reset the check engine light. i should have left if off longer.

i have a really dumb question... is cylinder 3 in the front of the engine, ( towards the front bumber )

or is cylinder 3 in the rear of the engine ?

the reason i ask... is i had the spark plug wires looped over something to keep them separated. they got bumped, and i wonder if the check engine light is still on, because maybe i crossed the spark plug wires???

thanks for any help in advance.

and BTW, i bought this chevy used for a vehicle to save mileage on my truck 2 years ago.
i just bought a 2011 Ford F350 crew cab / long box / 6.7 liter diesel. 400HP and 800Ft Lbs of torque
Link Posted: 9/4/2010 5:57:39 AM EDT
Pretty sure you need to reset the computer with a scan tool....unplugging the battery doesn't work
Link Posted: 9/4/2010 5:57:57 AM EDT
[Last Edit: 9/4/2010 5:58:26 AM EDT by Cowboy1967]
The spark plug wire could be broken too. As a rule if I change any part in the ignition, I change them all... the plug it self could be fouled too.
Link Posted: 9/4/2010 6:00:06 AM EDT
#3 is the middle cylinder on the back side.#3 and #6 share a coil.#6 would be on the front right.1,3,5 on the back,and 2,4,6 on the front,laft to right.

A bad spark plug wire can burn out the coils-have you replaced the plugs and wires?
Link Posted: 9/4/2010 6:03:15 AM EDT
[Last Edit: 9/4/2010 6:04:10 AM EDT by JINXR]
Cylinder 3 should be on the back of the engine. Sometimes they are numbered on the coils or near the coils. If it's still misfiring, it might not have been a bad coil. It could also be a spark plug or fuel injector.

ETA: the front is 2, 4, 6 and the side nearest the firewall is 1,3,5 the coils as you look at them from passenger to drivers side(passenger side being the right) 5,2 /3,6 /4,1
Link Posted: 9/4/2010 6:14:11 AM EDT
[Last Edit: 9/4/2010 6:14:22 AM EDT by builttoughf250]
thanks guys

i should have mentioned that i replaced the plugs and wires this easter.

if it were an injector, are those tough to replace on these cars?
Link Posted: 9/4/2010 6:19:51 AM EDT
I have a 2002 Chevy with a 4.3,
from what I have noticed - when I fix what ever mad the light come on, the engine light will clear itself after 10 or so start-ups with no error.
Link Posted: 9/4/2010 6:23:31 AM EDT
You do need to clear the code, just unplugging the battery will not clear it.
Link Posted: 9/4/2010 6:26:38 AM EDT
[Last Edit: 9/4/2010 6:29:19 AM EDT by WildApple]
Originally Posted By AKEotech:
I have a 2002 Chevy with a 4.3,
from what I have noticed - when I fix what ever mad the light come on, the engine light will clear itself after 10 or so start-ups with no error.


The light going out doesn't mean the code is cleared....but yes the light may go out after a while

Advanced auto will clear the code for free if they have the tool .....Most larger hubs handling commercial accounts have scan tools handy
Link Posted: 9/4/2010 6:40:32 AM EDT
My wife's van has the same motor and had a cylinder misfire last year according to my F.I.L who put on it his computer. It was a loose plug wire.
Link Posted: 9/4/2010 6:44:01 AM EDT
Originally Posted By builttoughf250:
thanks guys

i should have mentioned that i replaced the plugs and wires this easter.

if it were an injector, are those tough to replace on these cars?


Depends on your ability. It can be a DIY project if you have the tools and time.
Link Posted: 9/11/2010 6:01:46 PM EDT
well here we go again.

this morning i jump in the car and head off down the road. driving fine. then out of nowhere on the highway it starts "stuttering"

like a misfire in the cylinder. but not very loud or anything you could just feel it in the gas pedal / through the vehicle. then it stopped. then a few miles later it did it again, off and on. i was halfway done with my errands and had to finish them. it really didnt do it *much* after that. drove it for another half hour.

so i put some STP fuel injector cleaner in it. i put the original spark plug wires in the trunk. maybe it if starts doing it again ill put the original #3 wire back on to see if the NEW wire was junk.

a new injector is $95 + tax so i dont think i should just pop one in to try it out.

any other ideas? that latest coil only lasted a week or less.
Link Posted: 9/11/2010 6:15:35 PM EDT
and where the hell did they hide the injectors !?!?!?!?!?!?!
Link Posted: 9/12/2010 11:57:33 AM EDT
[Last Edit: 9/12/2010 1:21:43 PM EDT by builttoughf250]

UPDATE-

found a small crack in the #3 plug wire. replaced the rear 3 wires and she runs like a top again.

thanks for all the help.
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