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2003 chevy impala #3 misfire already changed coil, wire and plugs

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6 Suggested Answers

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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Posted on Jan 02, 2017

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66 chrgr
  • 1011 Answers

SOURCE: code p303

very common problem two things either the injector on that cylinder is bad or the fuel rail need clean out with injection clean a good shop can clean them.

Posted on Jan 25, 2009

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davesmith_37
  • 94 Answers

SOURCE: cylinder 2 misfire on a 1998 chevy blazer

check your plug wires for tears and dont overlap them

Posted on Feb 27, 2009

  • 150 Answers

SOURCE: 2003 chevy venture,cylinder3 misfire

Well you don't say what engine it has. I just had to put a helicoil in the head of a 3.4L 'cuz it had pulled the threads out of rocker arm bolt hole for cyl. #3. Car ran great afterward.

Posted on Feb 19, 2009

Molson02536
  • 3854 Answers

SOURCE: chevy 350 no spark

Check the distributor module (ICM), it may have gone bad and needs to be replaced. It's around $40.00 and it's under the rotor in the distributor assembly. Check the red lead wire to the HEI for voltage, there should be 12 volts. It common for the ICM to fail on the HEI system and if you go to Auto Zone, they can give you the step by step instructions to replace the ICM. Good luck and keep me posted, be glad to help.

Posted on Jun 11, 2009

  • 5 Answers

SOURCE: 2003 Chevy Venture misfiring

The injector is a good possibility, although you should check for spark in the wire first, as the electrical is the weakest link in the system. Put a spare plug in the end of the wire with the plug resting on metal, then have someone crank the van to see if you have spark that far, test and replace spark plug, (do not get shocked!) then look into a new injector or a good cleaning.

Posted on Jul 17, 2009

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2 Answers

What would cause a 2003 chevy impala's coil pack to break down?


did u reset the computer after changing coil pack - I was told anytime you put a new electrical part on newer cars the comp has to be reset otherwise the comp don't know that a new part has been installed!!

Aug 10, 2014 | 2003 Chevrolet Impala

1 Answer

2004 chevy impala, jerking when trying to accelerate. Check engine light flashing


Cylinders are probably misfiring. Plugs probably need changed. Also have a local parts store check for any check engine light codes. May have multiple cylinders misfiring. Could possibly be plug wires (If it has them) or the Coils on the plugs (if it is set up like this instead of plug wires).

Jul 27, 2014 | 2004 Chevrolet Impala

1 Answer

2003 Impala misfire. Plugs and wires are good, possible distributor or coil?


The engine does not have a distributor. There are 3 coils for 6 cylinders.
You can switch coils with another cylinder and see if the problem moves.
You can also check the plug for spark.
Generally speaking, oil on the inside of a plug is caused by internal cylinder problems.

Apr 17, 2013 | 2003 Chevrolet Impala

1 Answer

What can cause a cylinder 1 misfire in a 2003 Chevy impala with a 3.4 liter engine


Misfire reasons.
Bad ignition coil (there are 3 of them), bad spark plug, bad spark plug wire (most common) defective fuel injector, intake manifold vacuum leak, low cylinder pressure due to burnt valves or scored cylinder walls.

Sep 25, 2011 | 2003 Chevrolet Impala

1 Answer

P0300 random misfire chevy 2002 impala


depending on mileage, but possible tune-up could fix it. if already done then check ignition coil pack and ignition wires also spark plugs, check vacuum hoses for leaks or porous, last injectors clogged - use some techron fuel injector cleaner (wal-mart has them). have worked at G.M. dealership for over 15 years, saw that alot.

Feb 12, 2011 | 2002 Chevrolet Impala

1 Answer

1994 Chevy Impala, Code P0303, Running rough


Your #3 cylinder has a misfire. Check the spark plug & the wire connection. Check the spark plug wire for excess resistance. Good luck!

Oct 18, 2010 | 2003 Chevrolet Impala

2 Answers

2003 Chevy Impala 3.8L #3 and #6 not firing, we replaced the coil still not firing. Husband doesn't think 2 plugs would go bad at the same time any suggestions?


may be a bad module it is under the coils I think 3 and 6 are on the same coil so that would make both cyls not fire

Apr 12, 2010 | 2003 Chevrolet Impala

2 Answers

Engine misfires


You didnt mention having changed the spark plug wires, so that is another item that could be culprit as well. As well, it could be a coil pack that is not working properly.

I cannot recall at the moment if that model year uses coil on plugs or if it uses coil packs. Either way, if it uses a coil on plug set up, take the one for the #3 cylinder and move it to say #4 or anyone of your choice and see if the misfire follows

If it uses coil packs, there is likely one coil pack that controls two cylinders. In that case just swap the coil pack with an adjacent one and see if the problem follows. Pay attention to where the spark plug wires go because it will be an issue if you get them mixed up. You just swap the coil packs around.

I would, however, start with the spark plug wires if you have not changed them already.

Dec 31, 2008 | 2003 Ford Explorer

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