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2005 impala misfires at idol - Cars & Trucks

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Could be tune up,fuel filter,coils and module.

Posted on Apr 24, 2013


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I have a 2005 GMC Envoy last night it started idoling real rough and the little engine light came on. when idoling it goes back to running rough and the engine light come back on and flashes.

I just went thru the same thing with my Silverado. Ok first thing to do is check your fuel pressure. You can rent the pressure testing gage at autozone. Usual pressure needed is 50lbs. Next thing to check is your fuel pressure solenoid. It's a good guess that it's one of those two things. The best investment you can make is to buy the little computer/engine code reader. You dont have to buy the high dollar one, the one I use was only 60.00. Best investment ever. Very easy to use, it plugs in usually just to the left of your steering column.

Nov 09, 2016 | 2005 GMC Envoy

1 Answer

2005 chevy impala strugles when I accelerate

Try this, after it's dark outside open the hood,spray a little windex
on the plug wires then start the car,if you see any glowing or sparks
jumping around ,it's time for a set of wires.Probably the most common
thing I see. The windex just brings any weak wire out .

Mar 19, 2013 | 2005 Chevrolet Impala

1 Answer

Code p0303 on 2005 chevy impala

generic code for GM, misfire on cylinder 3

Sep 11, 2012 | 2003 Chevrolet Impala

1 Answer

I have a 2005 Chevy Impala and the check engine light just came on what should I do?

Take it to a place like Auto Zone and they will hook up their computer to it and tell you what the fault code is for free. Most common is a misfire which would indicate new plugs or wires.

Feb 29, 2012 | 2005 Chevrolet Impala

1 Answer

What is the cylinder layout of an 2005 impala 3.4. the wires i put on don't have # 's and i'm having a misfire on cylinder 3

For the 3.4 V6:

Firing Order:


Ignition Connections:

Let me know if this helped, or if you have additional information or questions. Feel Free to contact me at!

Mar 24, 2010 | 2005 Chevrolet Impala

1 Answer

Car runs rough at idol,hard to start after it warms up.

048 Engine Hard to Start or No Start Scan Data for Starting Problems This is how you find problems like your's , viewing scan data , sensor data parameters . What are the fuel trims at ? +- 5 to 10 % . short an long term trims . Do you know what these are ? Are the O2 sensors switch normally ? What's the coolant temp ? Intake air temp . Is the check engine light on or flashing ? Mass air flow sensor data . Misfire codes ?
047 Engine Hard to Start or No Start Scan Data for Ignition
056 Engine Hard to Start or No Start Misfire Scan Data

Sep 12, 2017 | 2005 Chevrolet Malibu

1 Answer

I replaced the coil blocks, wires, and plugs on my 2005 chevy impala 3.4. I am still getting random misfireing, what else can it be?

could be a fuel problem or a fuel injector. these engines are also bad to leak water at the intake manifold gaskets, if coolant leaks internally it would kill the spark and cause a misfire. if its not low on coolant though i'd keep checking fuel and fire

Oct 24, 2009 | 2005 Chevrolet Impala

1 Answer

I hAVE a 2005 impala i just did the tune up still misfireing # 2 cylinder this was the only code on machine please help

The problem could be the fuel injecter on that cylinder or the coil pack for that cylinder

Oct 18, 2009 | 2003 Chevrolet Impala

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