Question about 1996 Buick Roadmaster

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My spark plugs are changed gapped at .050 and the wires are new and completely snapped on and no crossed wires . Changed coil and still the engine lite blinx and it stinx and misfiring. I did get 2 done and had to run get a socket .

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To save youself some grief, you should scan the PCM for codes. This would lead you to other items that may be causing the problem.
You mentioned you did 2 and had to run and get scocket? Did you change all the plugs?
The igntion control module is located under the coils, these have malfuntioned and cause very odd symtoms.
Another possible problem is loss of compression in a cylinder due to a burnt valve.

Posted on Apr 08, 2011


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1 Answer

Chang spark plugs

The first thing to remember is only change plugs on a cold engine, or you can risk damaging the cylinder heads. Disconnect the battery, and remove the sparkplug wires from the plugs (pull the boot, not the wire). A slight turning of the boot may aid removal; be sure to keep the wires in order. Use a socket to remove each spark plug from the cylinder head. Check for oil or black soot, which may indicate an engine problem. Check the gap of the new plugs before installing; the recommended gap is .060" - you can get a simple gapping tool at any auto store. Thread each new plug into the cylinder head, being extremely careful not to cross-thread them. Snug them down; do not over-tighten. Re-attach the plug wires until you hear them snap on. Reconnect the battery and drive.

Sep 08, 2013 | 2000 Pontiac Grand Am GT

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How to change spark plugs in a 2005 chev colorado



1. Remove the ignition coils (lines at end this document), then return here once you have gotten the Coil
Packs off and precede with step 2 from here.
2. Clean the spark plug recesses with low pressure air. CAUTION: Wear safety glasses
when using compressed air, as flying dirt particles may cause eye injury. NOTE:
Clean the spark plug recess area before removing the spark plug. Failure to do so could
result in engine damage because of dirt or foreign material entering the cylinder head, or
by the contamination of the cylinder head threads. The contaminated threads may prevent
the proper seating of the new plug. Use a thread chaser to clean the threads of any
3. Remove the spark plugs from the cylinder head. NOTE: Allow the engine to cool before
removing the spark plugs. Attempting to remove the spark plugs from a hot engine may
cause the plug threads to seize, causing damage to cylinder head threads.
4. Inspect the spark plugs.



1. Measure the spark plug gap on the spark plugs to be installed. Compare the measurement
to the gap specifications. NOTE:
• Use only the spark plugs specified for use in the vehicle. Do not install spark
plugs that are either hotter or colder than those specified for the vehicle. Installing
spark plugs of another type can severely damage the engine.
• Check the gap of all new and reconditioned spark plugs before installation. The
pre-set gaps may have changed during handling. Use a round feeler gage to ensure
an accurate check. Installing the spark plugs with the wrong gap can cause poor
engine performance and may even damage the engine.
2. Install the spark plugs to the cylinder head. NOTE:
• Be sure that the spark plug threads smoothly into the cylinder head and the spark
plug is fully seated. Use a thread chaser, if necessary, to clean threads in the
cylinder head. Cross-threading or failing to fully seat the spark plug can cause
overheating of the plug, exhaust blow-by, or thread damage.
• Refer to Component Fastener Tightening Notice in Service Precautions.
Tighten the spark plugs to 18 N.m (13 lb ft).
3. Install the ignition coils.

1. Remove the air cleaner resonator and outlet duct.
2. Disconnect the engine wiring harness electrical connector (1) from the oil pressure sensor (2).
3. Disconnect the engine wiring harness retainers (1) from the power steering pump (2).
4. Disconnect the engine wiring harness electrical connectors (1, 4) from the following:
• The exhaust camshaft position (CMP) sensor (5)
• The camshaft position (CMP) actuator solenoid valve (6)
5. Disconnect the engine wiring harness retainer (2) from the camshaft cover (3).
6. Disconnect the engine wiring harness electrical connectors from the following:
• The engine coolant temperature (ECT) sensor (1)
• The fuel injector harness (2)
• The ignition coils (4)
• The heated oxygen sensor (HO2S) (5)
7. Disconnect the engine wiring harness electrical connector from the intake camshaft position (CMP) sensor.
8. Carefully disengage the engine wiring harness conduit from the camshaft cover, and position aside.
9. Remove the ignition coil bolts.
10. Remove the ignition coils from the camshaft cover.

1. Install the ignition coils into the camshaft cover. IMPORTANT: Ensure the ignition coil seals are properly seated to the camshaft cover.
2. Install the ignition coil bolts. NOTE: Refer to Fastener Notice in Service Precautions. Tighten the ignition coil bolts to 10 N.m (89 lb in).
3. Attach the engine wiring harness conduit to the camshaft cover.
4. Connect the engine wiring harness electrical connector to the intake CMP sensor.
5. Connect the engine wiring harness electrical connectors to the following:
• The ECT sensor (1)
• The fuel injector harness (2)
• The ignition coils (4)
• The HO2S (5)
6. Connect the engine wiring harness electrical connectors (1, 4) to the following:
• The exhaust CMP sensor (5)
• The CMP actuator solenoid valve (6)
7. Connect the engine wiring harness retainer (2) to the camshaft cover (3).
8. Connect the engine wiring harness retainers (1) to the power steering pump (2).
9. Connect the engine wiring harness electrical connector (1) to the oil pressure sensor (2).
10. Install the air cleaner resonator and outlet duct.

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Jan 23, 2012 | Cars & Trucks

1 Answer

I got code PO 305 on a 2002 Mercury Grand Marquis, what is the spark plug wire part called, is it #5 coil, and should I replace the coil and spark plug and what should the spark plug be gapped at? Thank...

I got code PO 305 on a 2002 Mercury Grand Marquis, what is the spark plug wire part called
This will have a direct coil over ignition with a coil over each spark plug. The coil is the electrical part over the spark plug. The coil also has a rubber part that is called the boot or spark plug boot. The boots can be purchased separately but the coils will come with new boots.

is it #5 coil,

Have you checked to see if there is any spark coming out of the number 5 coil?

and should I replace the coil and spark plug and what should the spark plug be gapped at?

When was the last time the spark plugs where changed? It may be due for all the spark plugs to be changed. The spark plug gap is usually listed on the emissions sticker under the hood. It should be .050 - .056 or very close to that.

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My 95 monte carlo 3.1 has just started miss firing after i changed the spark plugs and wires


Feb 20, 2011 | 1995 Chevrolet Monte Carlo

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98 Sportage changed new plugs, wires, and boot and (fuse?) for coil packs. But now misfiring on 4th cylinder. Prior to tune was only getting poor fuel economy no misfires at all. What would i fix next?

if you started out with no misfire at all and then got a misfire after the tune up that does seem strange, my best guess would be that the plugs are not gapped correctly or the spark plug wire is, not completely snapped on, or the wire on the 4th cylinder was damaged when it was removed, i would start out making sure all the wires are on, you will either hear of feel a small snap when the wire is seated on the plug good, also make sure the wire is connected to the coil good

Jan 12, 2011 | 1998 Kia Sportage

1 Answer

I changed my front 3 spark plugs and a broken wire now and i have very bad rough idle and i could hear clicks? whats going on? should I put the old ones back on? the new ones were bought from...

The spark plugs should be matched up with the old ones to be sure that are the same as the new spark plugs and that the threads are not too long or too short and if the spark plugs were pre-gapped or if they need to be gapped, and the auto part store should have given you that information along with any spark plug gap because some spark plugs you can not set the gap on or they will be damaged. The spark plug gap should also be printed on the emission label out under the hood. Also, the other three spark plugs and wires should be changed to complete the ignition tune-up.

The spark plug gap should be the same amount between all of the spark plugs, and the farther apart that the gap is between the spark plugs the rougher the engine will run and idle, and the closer that you get to the same spark plug gap between the spark plugs the smoother the engine will run and idle.

It is also very important that the spark plugs be connected to the correct terminals on the coil pack or the engine will have a severe mis-fire and it will set a mis-fire DTC (Data Trouble Code) and cause the check engine light to come on.

Here is a firing order diagram to help assist you and let me know if need help with this diagram or if you require any further assistance.


Sep 21, 2010 | Hyundai Sonata Cars & Trucks

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I need to change the spark plugs on my 2006 Ford Fusion V6 3.0L. Do you have a diagram that shows where they are and the order in which they need to be changed? I can't seem to find this information...

No order, just do one at a time. on the engine there will be a valve cover on each side of the engine, below is a valve cover, the arrows are pointing to is the ignition coil packs, coil packs might have a plastic cover over them, if so remove cover, disconnect harness from coil, remove small bolt holding coil pack, pull up on coil, remove spark plug, do the same on other side of engine, don't forget to check spark plug gap, the spark plug gap is .050", hope this was very helpful.


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I changed out the spark plugs and wires and now the check engine light comes on and its misfiring

Wrong firing order? Incorrect gap on new plugs? Didnt replace coil pak/paks?
All are easy solutions that can affect your engine the same way.

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How complicated is it to change spark plugs

It depends.Some autos need to have the front tire removed to get to the plugs.Or the battery is in the way.

Lets say you have a clear view at the plugs.
1. Tools You need a 3/8 ratchet with an 6 inch extension and a 5/8 or 13/16 socket.
2.A blanket or towell to cover up your fender so you dont scratch the paint.
3.A spark plug gap tool.Plug type and gap should be listed on the engine sticker under the hood.
4.Optional-undo positive cable on battery.
5.Start on first plug.DO ONE AT A TIME.pull 1 plug wire off ,and remove spark plug using your ratchet and socket.Set gap on new plug and install into plug hole.
6 Pull one wire and plug at a time so you do not cross wires and mess up firing order.

May sound like alot but its really easy.

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