Question about 2003 GMC Savana

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Engine light on and off

Sometimes motor runs like is missing 1 cylinder  all spark-plugs and wires are OK.

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Take the vehicle to an autoparts store and have them scan the computer for any fault codes stored there. Most parts stores will do the scan for free. The codes should help narrow down the cause of the problem. Hope this helped and best wishes.

Posted on Aug 02, 2009

  • Bruce Canfield
    Bruce Canfield Aug 02, 2009

    Take the vehicle to an autoparts store and have them scan the computer for any fault codes stored there. Most parts stores will do the scan for free. The codes should help narrow down the cause of the problem. Hope this helped and best wishes.

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Posted on Jan 02, 2017

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Engine not firing on # 3 cylinder


Spark plug or coil likely problem. Might put a spark plug in the #3 wire and crank it over and see if it sparks. Plug will need to be grounded and someone to watch or crank engine for you. Leave original plug in hole while doing this. If you have a timing light. Attach it to the wire with it plugged to the original spark plug and start engine. If the light flashes the the coil and wire has power. If no light then more likely a coil. Depends on year of auto as well. Most of the newer ones have a coil for each plug. If its a older one... likely a plug or plug wire.

Dec 06, 2013 | Nissan Cars & Trucks

Tip

How To Find An Electrical Engine Miss


One way to find an engine miss, start the vehicle, and with a pair of leather gloves, (so you don't get a jolt and you might want to remove each wire boot and reinstall with the motor not running, this will help ease removal of the spark plug wires when the motor's running, also spraying some WD-40 and twisting the spark plug wire boots will help in removal of the spark plug wire). You'll want remove 1 spark plug at a time, if the engine bogs down or idle drops, put the wire back on, go to the next spark plug wire, until you get to the spark plug wire that has no effect on the running of the motor when you remove the spark plug wire from the plug, that is the cylinder that has a problem. The problem causing this could be the spark plug (wrong spark plug gap), a bad spark plug wire, the terminal on the distributor cap, or even an internal engine problems i.e, intake or exhaust valves, bent pushrods, broken or weak valve springs, or bad compression rings on the piston. This will help you narrow it down to what cylinder it is. If removing all of them doesn't make much difference, there could be a vacuum leak, caused by a broken or disconnected vacuum hose or fuel delivery problems, plugged fuel filter, low fuel pressure, or a bad fuel pressure regulator.

on Mar 09, 2010 | Chevrolet Camaro Cars & Trucks

1 Answer

I have a 2007 1500 suburban - check engine light came on and started missing - code showed cylinder 1 missing - i changed spark plugs and noticed that the #1 spark plug had a piece of the ceramic broken...


cylinder 1 getting too hot causing ceremic crack could have wrong heat range plug in which spark plug too hot.or need replace spark plug wires.one plug wire could be bad best replace all spark plug wires.

Sep 08, 2013 | Chevrolet C1500 Cars & Trucks

1 Answer

Have 1994 toy. truck with v6, when choke goes off the engine misses


Hey 94 TOY...

When did the problem start? Before you changed the wires and plugs? Or did it start, AFTER you changed the wires and plugs? Did the problem remain the same BEFORE & AFTER you made the changes?

1 - If the TOY ran fair to Okay before you did the work, then you may have done something wrong when you made the cahages. Check for correct plugs and firing order. Check for cross wiring. With engine runing pull one plug wire off each plug one at a time. Each pulled plug wire will slow down the engine. When you pull a plug wire that doesn't react and does not make any change ON or OFF that cylinder Plug.
Then that cylinder is not firing.

2 - Check for spark at that wire. If you do-not have Spark there, But the other wires do... the wire going to that cylinder is BAD.

3 - If you have the correct firing order and spark at all cylinders then the cylinder that did-not change the speed of engine has a compresstion problem. Bad valves, Piston or rings are bad... Major engine work and Major repair bill for the repair job.... GOOD LUCK....

Oct 15, 2012 | 1994 Toyota Pickup

1 Answer

Car is missing check engine light is on


check your spark plug wires. it sounds like cracked spark plug wire that is arcing. the best way to check this is at night , start engine and look for sparks around the plug wires.

Aug 26, 2012 | 1999 Mercury Sable

2 Answers

Multiple misfire


Hi Jason:
A Random/Multiple Cylinder Misfire Detected unfortunately doesn't tell you specifically which cylinder(s) is/are mis-firing, nor why.

A code Random/Multiple Cylinder Misfire Detected 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.

Hope this helps; also keep in mind that your feedback is important and I`ll appreciate your time and consideration if you leave some testimonial comment about this answer.

Thank you for using FixYa, have a nice day.

Feb 26, 2012 | 2001 Pontiac Grand Am SE

1 Answer

My 2004 Kia Rio w/161,000 miles is missing on the #1 and 4 cylinders. I've had the ignition coil, spark plugs, spark plug wires replaced, yet the problem persists. Sometimes, the car runs good for a f


The car computer does the firing of the spark plugs based on info provided to it by various sensors in car. Your mechanic is spot on. Ouch!

Jun 20, 2017 | 2004 Kia Rio

1 Answer

Intermittent misfiring


Had the same thing. The didtributor was going bad. Lived with it for a few months finally it died. 1 year after replacing the distributor the problem started again. Glad I got a warranty on the distributor. Running great now on the second distributor.

Jul 08, 2010 | 2001 Mitsubishi Diamante

3 Answers

Check engine light


A multi misfire may mean that one or more of the following has happened:
Faulty spark plug or wires, Faulty coil (pack), Faulty oxygen sensor(s), Faulty fuel injector(s), Stuck/blocked EGR valve / passages, Faulty camshaft position sensor, Defective computer.

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 wire, distributor cap, and rotor (if applicable). Otherwise, check the coils (a.k.a. coil packs). In some cases, the 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.

Good luck and hope this information helps, keep me posted, be glad to help you get the truck running 100% again. Not sure if your running a K&N air filter, and if you are there may be a flim of oil on the MAF sensor that is making you run lean. You may want to spray down the MAF sensor with a can of MAF cleaner. 

Jul 02, 2009 | 2004 Dodge Ram 1500

2 Answers

Miss on # 3 cylinder


Check the plug and plug wire to #3, if they are ok test the fuel injector and test the compression on that cylinder.

Nov 09, 2008 | 2002 Ford Mustang

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