2004 Chev Impala Cyl 4 missfire - Engine Troubleshooting


	Auto Repair Home	SEARCH POSTS	WHO'S ONLINE	LOG IN

Automotive Repair

Car Troubleshooting Topics
  Car Troubleshooting
  Engine Troubleshooting
  Engine Fault Codes
  Electrical and Wiring
  Transmission Problems

Car Repair Topics
  Car Making Noises
  Car Stereo Repair
  Heating or AC Issues
  Motorcycles and ATVs
  Tricks of the Trade
  Truck Repair Advice

Site Options:
  Login
  Sign up here!

Latest Forum Post

1989 toyota pickup 3.0 crank no start

I have a 1989 toyota pickup 3.0 crank no...

Strut spring orientation and strut mount tension nut

2017 Nissan rogue awd 2.5 L Put in Monro...

Transmission stuck in part, I have tried everything

So I'm working on my elderly fathers 201...

2017 dodge journey LED headlights on/off randomly

Year of vehicle 2017 Make of vehicle dod...

Kia Soul starter replacement issues!

Okay so my car is a 2010 Kia soul 2.0 en...

Please Help - Knock sound & engine fail

Hi all, Hoping to get some insight and ...

multiple warning lights

2013 GMC Terrain 130,000 miles 4 cylinde...

03 alero no low speed blower

Good day everyone, I have a 2003 Olds a...

04 Chevy 2500hd tail light issues

Help!!! I have changed my combo switch...

1999 Grand Caravan Sport not starting.

Hi. I'm new here. I hope someone can hel...

2004 Chev Impala Cyl 4 missfire

Sign up here!

Search for (search options)

Auto Repair Home>> Automotive Repair>> Engine Troubleshooting

vatman22
New User

Jun 10, 2008, 11:23 PM

Post #1 of 4 (2439 views)

2004 Chev Impala Cyl 4 missfire	Sign In

I have a 2004 3.4L Chev Impala with a #4 Cyl missfire.

I have replaced both the wires, and plugs, and have checked out the coils.

When i pulled the plug outta #4 it was moist with fuel, but did not smell Unburnt.

what could my problem be anyways please..

thanks you

dave284
Enthusiast

Jun 11, 2008, 10:29 AM

Post #2 of 4 (2428 views)

Re: 2004 Chev Impala Cyl 4 missfire	Sign In

When you said checked out the coils, how was this done? It could be the ICM or its contacts, thats the unit under the coil packs.

DanD
Veteran / Moderator
DanD profile image

Jun 11, 2008, 11:59 AM

Post #3 of 4 (2424 views)

Re: 2004 Chev Impala Cyl 4 missfire	Sign In

Keep in mind that the ignition system isn’t the only reason a cylinder will misfire.
Other things that should be checked is the fuel supply and delivery, engine mechanical, induction(vacuum leaks) and then the electronics.
I’m just a guilty as the next person and automatically go to the ignition because probably 75% or better of the time it is the cause. I’ve been bit in the ass a few times, too find low compression in a cylinder or a defective injector.

Just food for thought?

Dan.

Canadian "EH"

vatman22
New User

Jun 11, 2008, 2:20 PM

Post #4 of 4 (2421 views)

Re: 2004 Chev Impala Cyl 4 missfire	Sign In

thanks for the info...

i checked the Ohms on the coils, as you should.. and they all checked out.. then i did a spark test.. and that seemed to check out as well...

i am just thinking that it really can;t be fuel system (except injector), or other electrical, because its ONLY cyl 4....

i did a compression and leakdown check.. and that was ok as well...

I am now begining to wonder if its the injector.... just because the ignition seems to check out for cyl 4.. as does the compression... .. so as far as i know.. the only other thing that will just affect ONE cyl... would be injector...

if i am totally out in left field here... please someone put me strait.. i don;t wanna pull and injector if i am totally missing something...

thanks again

Search for (options) Privacy Sitemap