Question about 1998 Chevrolet Express

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Check engine light on mis firing on #5 did tune up wires and plugs

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Did you replace the distributor cap?

Posted on Jul 10, 2010

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Wend I gun the car engine light and hold start flashing and engine mis fire no power


Flashing engine light is saying that you have a "mis-fire" you need to address. Usually this will be a bad spark plug wire or spark plug. Simple fix. You can do it yourself.

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please tell me in this tune up you had new spark plugs put in? if check engine light is on there are some stored codes those will give you the suspect cylinder(s) check to see if you have plug wires if not there will be a coil for each cyl. pass. side of motor starting in the front working to the back or firewall cyls are 1,2,3,4 driver side same front to back 5,6,7,8 codes will be PO301 cyl 1. PO302 cyl 2. etc. get the code find the correct cyl. unplug little connector u will need a 7mm socket to remove the bolt holding the coil in place then pull up on the coil and boot.... if u have plug wires get the code find correct cyl and follow plug wire to coil pack in front of engine there will be two one on each side in front of engine...

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One of the engine cylinders is mis firing (did a code check). the check engine light initially flashes when first driving, then remains on -does not flash any longer) would that damage the catalytic...


it is very important to keep the engine tuned up, and yes an engine miss fire could damage the catalytic converter. the 1990 does not have a code for a miss fire it is probley just a bad spark plug or spark plug wire, and remember when it comes to spark plug wires you get what you pay for.....have fun

Dec 24, 2010 | 1990 Pontiac Grand Prix

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After a tune-up ie. wires,plugs,cap,rotor fuel filter the truck is running rough mostly in drive when I have my foot on brake. The check engine light is on took it to Auto Zone for free check and it said...


Check the main vacuum line that goes to the vacuum booster control unit for the power brakes if it is leaking your looseing engine vacuum and would run bad

Nov 29, 2010 | 1998 GMC Sierra

1 Answer

Dodge obd code p0305


The DTC (Data Trouble Code) P0305 is the generic OBD-II DTC for "Cylinder 5 Mis-fire Detected", and it means that the OBD-II control unit has detected a problem with the #5 cylinder.

The problem could be a faulty spark plug, or a spark plug wire for the #5 cylinder, or the coil for that cylinder could be faulty (2.7 liter), or the distributor or distributor cap could be faulty (3.0 liter), or the fuel injector for the #5 cylinder could be faulty.

Before you look for any electrical problems causing the mis-fire on the #5 cylinder, first do a compression check to be certain that the mis-fire is not caused by a mechanical problem.

Here are the firing order diagrams for the 2.7 and the 3.0 liter enginesto help assist you.


2.7 liter

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3.0 liter

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Jul 03, 2010 | 2002 Dodge Stratus

1 Answer

When first started it runs find. After it starts


Hi:
First you should try to get the #5 misfire taken care of , and clear the check engine light. It most likely is a bad spark plug or wire, but I would replace all plugs and wires with new. Clear the code and if it comes back, continue your troubleshooting.

Nov 24, 2009 | 1998 Chrysler Cirrus

1 Answer

No check engine light on runs rough while in gear


Plug Mis-firing (firing-but not adequately) no light and no fire.
Causes: Spark plug bad, spark plug wire leaking.
If you can pull the spark plugs - and you find that one of them is wet or very dirty - compared to the others....the you have the wire/plug source identified.

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Our 2005 Honda Odyssey had a check engine light / misfire


When a cylinder mis-fires there is a reason. The dealer should have told you that. Most likely you have a fouled out spark plug. Which means you need new spark plugs and maybe wires. All this would be covered in a standard tune up. Once the bad spark plug is replaced, the computer will quit registering a mis-fire. Please give good ratings, they meen a lot to us.... Thank you

Aug 01, 2009 | 2005 Honda Odyssey

1 Answer

Engine has miss-fire


First check spark plugs/wires/distributor cap (tune up). Also would be good idea to use fuel injector cleane and change fuel filter and O2 sensor.
Hope that helps
Good Luck

Mar 22, 2009 | 2003 Audi TT

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