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I replaced the coil plugs and wires and it is running ruff. I need a wiring diagram to make sure the wires are on the right spot on the coil.

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If your car fires up, then the spark plug wires and coil wires are properly done. if it is running rough then you may have made one of several mistakes.

you may have needed to "gap" the arc end of the spark plugs (unless they were specifically "pre-gapped" for your particular make and model).

you may have not tightened one of the spark plugs all the way in, allowing too much air to enter the combustion chamber.

worst of all, you may have cross-threaded a spark plug, which would also allow too much air into the compustion chamber. it is usually possibe to re-thread the spark plug hole, using what i believe is called a "tap-and-die", but i have never done this before, so i am not sure if its success rate or difficulty level.

Posted on Mar 26, 2011


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2001 montecarlo 3400 sfi. I just replaced lower intake gaskets reassembled engine now car cranks but wont start, and backfires. Had it running for 30 mins the other day but ran ruff

Is it possible some of the push rods are in the wrong holes ?
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Looking for a diagram to replace spark plug wires for 2006 Kia Sorento EX 3.5

Are you sure it has wires check close it may use separate coils for each cylinder that replaces the need for coil wires.

May 19, 2013 | Cars & Trucks

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Runs ruff after changing plugs and plug wire

I have owned several new vehicles
over the last 50 years & seldom change
plug wires

In fact, I fail to see why people do that

I would guess you put the problem in there

Yes-- I have tens of thousands of dollars in
tools & test equipment,so I test every thing

Obviously if something fails a test, it gets replaced

If you had no problem to begin with & were just changing
plugs & I suggest every 3 years,then you some how failed
to make a diagram of the cylinders,coil pack,wire locations,
before you started

You need to know the cylinders & firing order also,
in case you get messed up

Loose the front oxygen sensors, if you have 100,000
on them

Clean the MAF Sensor

Check for Vacuum Leaks

Get the new wires on correctly & use
a ball point pen to make the cylinder #
on both ends & get your diagram drawn
for next time

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Need a spark plug diagram


Take a look at this picture. This is from a 94 cougar V8, on the left and right are coil packs with wires coming out and going to the sides of the engine. On the spark plug side you pull to remove, on the coil side squeeze the clips and pull up. IMPORTANT - Do one wire at a time so that you put the wires in the same spot as you took them off.

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2 Answers

After installing spark plugs, cars running ruff

Make sure the spark plugs are gapped correctly,and they are not from auto zone,they use factory seconds,Make sure the boots are on the coils ,and spark plugs too.Then look at the primary wiring to the coils to make sure they are going to the correct coil(cylinder).

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1 Answer

Replacing coil in 2001 ford taurus

Disconnect all 6 spark plug wires from the coil twist them while you pull up is the best way to take them off. To make sure you are putting the same wire back in the same spot on the new coil I would take a few pieces of masking tape and label the spark plug wires as you remove them and make a little diagram of the coil pack and which wire goes where that way when you put the new coil in you won't have any issues with mixing up the order of the wires on the new coil. I just use a marker on the coil and number the 6 spots and then label a piece of tape to the wire number and do this 1 at a time. then just disconnect the wiring harness attached to the back of the coil and remove the three bolts holding the coil down and its ready to replace. My advice is to have the new coil ready before you unhook the old one. This saves a lot of problems when making sure you hook up the wires to the right terminals when your hooking up the new coil. One of my rules when I am working on anything on my car is I now label things and take a quick picture of it before I take anything apart that way I always have a picture or two of the area i am working in it might sound like a waste of time or not necessary but it will always make up for it in the end if you ever have questions about the location of any of the parts your taking out or how to install it.

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Check engine light

A multi misfire may mean that one or more of the following has happened:
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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. 

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1 Answer

The destributor cap was loose, engine was running ruff, replaced cap, tuck running fine. After 100 miles it is running ruff again and check engine light is on. I found a hose around the destrutor cap,...

When's the last time you replaced the spark plug wires? Try that for you mis-fire. As for the vacuum hose, there should be a routing diagram somewhere on the hood or engine compartment somewhere. Trace it out and find where it should go. Oh BTW, bad spark plug wires can ruin a distributor cap.

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Replaced distribitor and rotor now wont start on 91 chevy blazer

make sure u have the wires in the correct spots, there is a firing order, u need to have them in the right spots or else it wont fire, call ur local parts store and they will give u the firing order

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2 Answers

2002 Ford Focus 2.0l SOHC running on 3 cylinders

I had this problem too exept I have no clue what parts or blah b;ah blah. I just know that my coil pack was getting fried.burnt out because my wires were bad. The mechanic I went to was a moron because I took the car to him 3 times and he kept saying it was the coil ad kept replacing it. I took it to my uncle and he said my wires were in horrible shape and when this is the problem it fries your coil making your car run like a lawn mower! Well all i did was replace my wires and the car ran great! Well I hope this helped..

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