Tip & How-To about Chevrolet Camaro

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.

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1 Answer

vehicle runs roughly and misses

-Run the car to temperature.
-Unplug the spark plug wire One At A time. You'll notice witch one misdfire. (Carefull it's very hight voltage!!. Need leather glove!)
Q: How do I know it misfire or not...?
A: After unplung EACH PLUH WIRE if the engine Not change any thing. That is the one misefire.
-After locate it. Tur engine off Check for crack or broken wire or bad plug.
Don't see any thing...?
Now take hook it to a spare spak plug and click the plug's body to ground and start the car.
Q:You see spark there..?
A: No.>>> Bad plug wire. Replace it.
Yes. Then

Next step do compression test. If all are good then check injector

Mai Lor

Feb 28, 2013 | Volkswagen Cars & Trucks

1 Answer

2005 3.3 litre grand caravan has a miiss and service engine light is on

A miss in the engine could be several things, but the most common is a bad spark plug wire or boot. You can check each wire for bad spots, but a trick I use is a dark garage with the car running. Use a pair of leather gloves to move the wires around, because 30,000 volts hurts! Any glowing blue is a "leaking" wire, and you may even have a shorted wire that throws tiny bolts of lightning. Replace all of the wires with a good quality set. A good set of spark pugs at the same time is also a good idea because a bad wire will ruin the plug. And yes, a bad plug or wire will turn on the check engine light because it trips the knock sensor and O2 sensors. The other common miss problem is bad fuel and or plugged injectors. Try a fuel system cleaner.

Mar 14, 2011 | 2005 Dodge Grand Caravan

1 Answer

2001 ford ranger, 3.0L running rough, seems like cat converter getting hot too, could this be a bad coil pack, plugs and wires look ok

Start the engine and let it idle.Pull off the spark plug wires one at a time(wear leather gloves or use a plug wire tool to avoid being shocked).The wire that you pull off that makes no difference to the way the truck runs is the problem.If a set of plugs and wires don,t fix the problem,remove the suspect plug and check to see if it is firing by laying the metal portion against a good ground and then have someone turn over the engine while you watch for spark,if you have spark then you likely have a plugged catalytic converter,if there is no spark then you need a coil pack.

Sep 12, 2010 | Ford Ranger Cars & Trucks

2 Answers

1992 accord shakes at idle,in gear

possible motor mount old hondas don't have strong stock mounts

Mar 09, 2010 | 1992 Honda Accord

1 Answer

i have a terrible miss and i have changed tha spark plugs and wires. i also have tried a new coil pack and egr vavle. still not better

You might try, with the truck running and wearing some leather gloves, pull each plug wire and note the response. If you remove one, and there in no change, the problem would mostly be with that cylinder. Could be a bad injector.

Mar 08, 2010 | 1998 Ford F150 Regular Cab

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