Question about 2004 Chevrolet Impala

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2004 ss impala missfire during idle

Engine shutters terribly during idle and the longer it runs the worse it gets. The engine will eventually die. Runs fine above 1500 rpms and have seen no signs of fuel mileage loss. Auto Zone performed PCM check and received two codes.This is what I received on their print out, P0304 and P0455. I have changed plug wires and plugs with no change. Need answer instead of replacing part after part $$$$$$$$$$.

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  • pamandgaryfr Jan 19, 2009

    After checking AutoZone results it shows misfire on #4 cylinder only and large leak detected in the EVAP system (whatever that is) Any solutions?

  • pamandgaryfr Jan 19, 2009

    Yes I have replaced the fuel pump. No change. I am beginning to run out of patience and money.

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Hi and welcome to FixYa,

Some ideas you may want to consider/try:

  • on the misfire, at night, opened the hood, start the engine. Look for arcing. It would be relatively small so preferably this has to be done in a dark area;
  • alternately, try switching plugs around so with the sparkplug wires. If the miss changes cylinder, then either the plug or the wire is the culprit (even new);
  • on the Evap issue, check for an emission canister/box behind the left (driver's side) rear wheel. Look for cracks/leaks;
  • additionally, you may want to remove the air filter, start the engine and spray the opening with carb/injector cleaner.
Pls post back result(s). Good luck and Thank you for using FixYa.

Posted on Jan 19, 2009

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First, I would still check to make sure the intake is not leaking. Leaking air can cause drivability problems as air not passing the MAF will cause a lean condition.

The P0304 indicates a possible injector problem in cyl. 4. You may want to do an ohm test on the fuel injectors. I am not sure what your ohm rating should be, maybe 16ohm? Of course this involves removing the upper plenum to get to the injectors.....



also, read the below mentioned for P0304


Subaru reports that owners of 2.5L 1999-06 Imprezas and Foresters and also 2000-06 Legacy and Outback vehicles may have misfire trouble codes set. Before jumping to replace the plugs and wires, check the ignition coil and wires for carbon tracking. Start by checking the coil towers. Look for what appears to be small cracks about 5mm long. If the coil towers look clean, check the spark plug wire boots where they connect to the coil towers. If you see tracks on the towers, clean them with a clean rag and isopropyl alcohol. Allow them to air dry. Install a new set of wires. Subaru has issued an improved set of wires designed to eliminate the carbon tracking. For the complete TSB (#07-60-07R), purchase a one week subscription to eautorepair for only $10. Then download all the TSB and repair information for your vehicle............


Now lets work on p0455


READ THE PROBLEM AND SOLUTION...


I have the P0455 Large Evap Leak code after I had been prompted to tighten my gas cap. I tried to tighten the cap... it would click 3x and then I could still pull it straight out.

So I thought "Ahhh ha!, I can fix this". Bought a new cap and it clicked on real tight and would not pull straight out. So I cleared the code and after 1 day, the tighten gas cap came on again. Then eventually the P0455 popped up again.

So almost every forum I've read says to bite the bullet and take it into a shop and have it 'smoked'. But I dont have the $95 for the shop to just "look" at it. So I was hoping to get some suggestions from any of you. So, I'm always opting to learn more from the field since that's where most of the action happens anyway.

Does anyone know where the charcoal canister is located? I found what I believe is the purge or vent valve behind the gas cap door (looking from underneath the left rear quarter panel). But if anyone else has had this similar problem with any tips to help me out, I'd greatly appreciate it. Many thanks! http://www.parts.com/oemcatalog/index.cfm?action=getJointLocator&siteid=2&chapter=&Sectionids=0,2496&groupid=2497&subgroupid=2500&componentid=0&makeid=6&model=Impala&year=2006&graphicID=CB06280&callout=1&catalogid=2&displayCatalogid=0 THANKS.

Posted on Jan 19, 2009

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The EVAP system is designed to store and dispose fuel vapors in the fuel system and help prevent their vapors from entering the atmosphere.
A leaky system will cause rough and speratic idle, as well as a leaky fuel injector and leaky intake manifold gasket. These can both be tested with a pressure tester. Also have your Mass Air Flow sensor tested. You can test any sensor by removing it and using an ohm meter to check for current.
www.autozone.com has a free illustrated online repair guide for your car.

Firstly I would check that the gas cap is on Tight. Secondly would to use a pressure guage and check for intake manifold or VACUUM LEAK.

Posted on Jan 19, 2009

  • Nate Stansfield
    Nate Stansfield Jan 19, 2009

    Code P0455 Means there is low fuel pressure. Which means there is a leak.

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If is the converter, the car will loose power will not go over 20 miles mph

your timing belt didn't get the timing right. .the timing belt, you have get the timing perfect. Your car is doing all of these things because is not getting the timing right. You have to be exact when doing the timing belt otherwise you have all the problems you are describing. If you not a DIY person, you can take it to a dealership and they can properly set the timing for you.

Posted on Jan 19, 2009

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Have you checked the fuel pump if that is old it needs replacement and if leaking it needs replacement.

Posted on Jan 19, 2009

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Replace the Fuel Filter. Get 2 Cans of B12 Chemtool from Wal-Mart or Auto Supply Store and run through tank one at a Time on a Full Tank. These should fix that Idle. ASE Certified Mechanic for 30 Years, This is where I start.

Posted on Jan 19, 2009

  • 3 more comments 
  • Travis Humphries
    Travis Humphries Jan 19, 2009

    Have you Checked the Spark plugs???? A Fouled out Plug will send this code to the Computer. Even a Burnt Plug wire.

  • Travis Humphries
    Travis Humphries Jan 19, 2009

    The Evap System is Just the Air Intake from the Front of the Vehicle into the Breather and the Air inside the Cabin. Common Code.

  • Travis Humphries
    Travis Humphries Jan 19, 2009

    Ok, After some more diging. Have you got another Chevy car or truck there that you can rob the Gas cap from????

  • Travis Humphries
    Travis Humphries Jan 19, 2009

    Your air leak is Coming from the Fuel Tank. You will need to Change the Gas Cap to fix this Problem. Could also fix a lot of the Idle Problem also.

  • Travis Humphries
    Travis Humphries Jan 19, 2009

    Your Fuel pump is Sucking air Causing your Miss and Rough Idle. Replace the Fuel Cap and it will stop.

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