Question about GMC Sierra 1500

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Check engine light comes on only when going up hills truck vibrates code shows number 4 cylinder misfier mechanic repaced cap and rotor all new fuel injectors plugs and wires have been replaced problem still exists

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  • bobbie_63 Nov 21, 2008

    I am having the same problem with my 1999 gmc jimmy only it is the 5th cyclinder misfiring and all the same things have been replaced. HELP!!!

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Could be low fluid levels to emissions 02 sensor or when the vehicle is on a slant the fluid levels such as oil etc brake fluid are reading below normal and simply need attention such as correct fluid specification levels or as i stated a tune up

Posted on Dec 17, 2009

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1998 nissan frontier xe 4 cyl auto misfire cyl #2 engine vibrates like a bad sparkplug when driving


To review - - do you know for a fact the distributor is firing that cylinder? And do you have power and a ground pulse for that injector ?
You say no vac leak, but have you done a compression test on all cylinders ? Is it possible the egr valve is leaking and affecting that cylinder ?

Feb 20, 2014 | Nissan Cars & Trucks

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GMC Sierra Code P0300 Check engine light


GMC Sierra with the code P0300 Q: I have the 2003 GMC Sierra with the code P0300. What could be the problem? A: The code P0300 means "Random Cylinder Misfire". This means that the engine computer has detected that one or more of the cylinders misfire randomly. This code could take some time to diagnose, as there could be a wide range of reasons for the engine cylinders to misfire. Here are just a few examples: bad spark plugs, ignition wires, distributor cap/rotor, bad fuel injectors, bad airflow sensor, broken or weak valve spring, leaking valve, low fuel pressure, manifold gasket leak, clogged catalytic converter, etc. Take your truck to a knowledgeable mechanic and have it check out - driving with the misfiring engine can damage your catalytic converter.
The mechanic can scan the engine computer with the scan tool and see the conditions when the misfire happens and check which cylinders are misfiring. A number of of other things will need to be checked to find the cause (e.g vacuum leaks, exhaust back-pressure, compression, etc.).

on Dec 07, 2009 | GMC Sierra Cars & Trucks

1 Answer

I have a 2003 chevy blazer. I am getting a p0303 cylinder 3 misfire. I have changed the spark plugs, wires, cap and rotor. It has 130,000 miles on it with a new tranny at 100,000. When I go up hill,...


The code means the cylinder is not producing power, which is not always an ignition problem.
It could also be a faulty injector, or something mechanical.

Sep 27, 2013 | 2004 Chevrolet Blazer

1 Answer

1998 altima runs fine idol hesitates &sputters under load


You may have a check engine light on which would require you to have the computer scanned for trouble codes. The codes would help direct you or a mechanic on what to test.
A cylinder miss could be ignition, fuel, or something mechanical.

Jan 13, 2013 | 2000 Nissan Altima

1 Answer

Hi my vw glof mk4 gti juders and misfiers when driving and no power on pull off . help would be greatfull


Basically this means that the the car's computer has detected that not all of the engine's cylinders are firing properly.

A P0300 diagnostic code indicates a random or multiple misfire. If the last digit is a number other than zero, it corresponds to the cylinder number that is misfiring. A P0302 code, for example, would tell you cylinder number two is misfiring. Unfortunately, a P0300 doesn't tell you specifically which cylinder(s) is/are mis-firing, nor why.

Symptoms may include:
* the engine may be harder to start
* the engine may stumble / stumble, and/or hesitate
* other symptoms may also be present

Causes: A misfiring code (P0300) may mean that one or more of the following has happened:
* Faulty spark plugs or wires
* Faulty coil (pack)
* Faulty oxygen sensor(s)
* Faulty fuel injector(s)
* Burned exhaust valve
* Faulty catalytic converter(s)
* Stuck/blocked EGR valve / passages
* Faulty camshaft position sensor
* Defective computer

Possible Solutions:
* If there are no symptoms, the simplest thing to do is to reset the code and see if it comes back.
* If there are symptoms such as the engine is stumbling or hesitating, check all wiring and connectors that lead to the cylinders (i.e. spark plugs). Depending on how long the ignition components have been in the car, it may be a good idea to replace them as part of your regular maintenance schedule. I would suggest spark plugs, spark plug wires, distributor cap, and rotor (if applicable). Otherwise, check the coils (a.k.a. coil packs). In some cases, the catalytic converter has gone bad. If you smell rotten eggs in the exhaust, your cat converter needs to be replaced. I've also heard in other cases the problems were faulty fuel injectors.

Random misfires that jump around from one cylinder to another (read: P030x codes) also will set a P0300 code. The underlying cause is often a lean fuel condition, which may be due to a vacuum leak in the intake manifold or unmetered air getting past the airflow sensor, or an EGR valve that is stuck open.

Keep us updated.

Feb 25, 2011 | 2003 Volkswagen Golf

2 Answers

P0305 code, new plugs, wires, cap, rotor, coil, fuel filter and still getting p0305 code any good ideas?


means misfire in #5 cylinder. found this for you. hope this helps
Common Problems That Trigger the P0305
  • Worn out spark plugs, ignition wires, coil(s), distributor cap and rotor (when applicable)
  • Incorrect ignition timing
  • Vacuum leak(s)
  • Low or weak fuel pressure
  • Improperly functioning EGR system
  • Defective Mass Air Flow Sensor
  • Defective Crankshaft and/or Camshaft Sensor
  • Defective Throttle Position Sensor
  • Mechanical engine problems (i.e.-low compression, leaking head gasket(s), or valve problems
Common Misdiagnoses
  • Fuel Injectors
  • Oxygen Sensor(s)
  • Power Train/Drive Train problem

Jan 05, 2011 | 1999 Chevrolet Suburban

2 Answers

Toyota ceilca 2000 gts will not start


try reseting the alarm,maybe all thats needed.....

May 01, 2010 | 2000 Toyota Celica

1 Answer

Check engine light comes on temporarily - engine chuggs at idle


Before changing you pcm try cleaning your egr valve. remove the valve and see if its stuck in the open position if so use a small pick to clean around the spring.

Mar 12, 2009 | 1999 Jeep Cherokee 4WD

2 Answers

99 5.2 durango :pulled codes for multipe missfire cylinder #5-7


Aloha We have just replaced all of what you have replaced, plus water pump, fuel pump, pcv valve and 02 sensor. Took it to mechanic today we had misfire on 1,2,6,7. Mechanic said that the 99 dodge is known for bad computers, he checked ours and works great turns out that it was the coil. Ours was jumping 1/4 inch and had a orange/yellow spark. it is supposed to have a 1 inch spark and be blue. This has solved our problems after 527 dollars later.
Check the coil!

Feb 26, 2009 | 1999 Dodge Durango

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