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2005 chevy impala, p0301 cylinder 1 misfire, I've had this same code before, changed plugs and wires and went away for about 6-8 months. When it starts it runs rough for a few minutes and smoothes out. I've also noticed that either the gas gauge is faulty or I'm getting a lot better mileage for maybe 2 weeks now or so

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6ya6ya
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Posted on Jan 02, 2017

SOURCE: Engine light on... the engine gets bad gas mileage

Cylinder #1 Misfire.
What experience you have, and how you approach this, is up to you.

Plugs don't fail
You don't throw wires at these things
You Diagnose the cause and repair.

If you got COP Ign Coils --go there for #1

Posted on Oct 13, 2010

  • 2 Answers

SOURCE: Misfire code P0301 2000 Taurus

Hi Sue,

Chances are when making your hose and tstat repair, you probably bumped a vacuum line enough to either create a tiny crack or knock off a line. First, you can just check all of the vacuum lines that are near where you worked and then all of them using the emission and vacuum diagram/sticker located either on the underside of the hood or above the radiator. The vacuum lines all originate from the upper intake manifold, which is the big multi-tube looking large thing on top of the engine. Unfortunately, if the leak is a small crack or slightly loose connection, they can be hard to find. If no luck, try listening to the engine with it running for a hissing/sucking.sound. If you have long hair be careful. Still no luck, if you have carb or similar cleaner, maybe WD40, or starting fluid, spray it carefully and precisely around the engine listening for the engine sound to noticeably change. That will be at the point where you have a vac leak that will need fixing. An alternative method that I like is to take a small diameter hose around 3 foot long (a short piece of garden hose, heater hose, fish tank hose, etc.) and use it like a stethoscope to listen around to pinpoint a hard to hear and pinpoint leak.

Posted on Mar 26, 2009

redbeard00
  • 957 Answers

SOURCE: P0301 - Cylinder 1 Misfire Detected on a 1998 s-10 idles rough

Sounds like a bad fuel injector. Shop would need to run a contribution test to confirm. I must say, good detective work, good luck.

Posted on Apr 29, 2009

  • 10934 Answers

SOURCE: O2 Sensor Problem?

yes an o2 sensor can cause those symptoms so can a minor vacuum leak --bad ignition wire -clogging fuel filter --sticking egr valve etc.

Posted on Mar 01, 2010

pippall
  • 1486 Answers

SOURCE: 2002 Oldsmobile Bravada. Service Engine

I would replace number 6 injector or have it reconditioned.There is dirt in the nozzle of the injector that causes this problem.No injector cleaner will clean dirt rust from the fuel tank, if that has entered them.

Posted on Jan 12, 2011

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Causes:
- Improper spark plug at cylinder #1
- Insufficient compression at cylinder #1
- Incorrect fuel pressure
- The injector circuit is open or shorted at cylinder #1
- Fuel injector #1 may be faulty
- Intake air leak

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Sincerely,

JC

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