If a car’s spark plugs are fouled, improperly gapped, or dead, it could exhibit one or more of these symptoms: Tranny fluid is right where it should be and oil too, I just re-read your post and realized the comment regarding the dash lights going out. One mechanic days alternator, the other says it’s probably my cars “brain” is fried. What sort of car are you talking about here? I have a 95 cadillac eldorado and it sort of jumps up and down 2-300 rpm`s at low speed.Spark plugs? The basic construction of a spark plug uses an upper contact tip that receives voltage from the ignition system through a spark plug wire. amzn_assoc_ad_type = "smart"; While driving the truck, the vehicle jerks when shifting different times on an Automatic transmission. I have a 1999 Oldsmobile Delta 88 LS. There is also an escalation in … can also make you stall. This can be caused by a dirty air filter, excessive driving at low speeds, too rich of a fuel/air mixture or idling your vehicle for too long. he will talk very professional over the phone until he gets your car and then he stops answering your calls and he lies and say your car needs this and that…..he tries to talk about God and thats how he gets you. They can knock around, harming the parts and surfaces they hit. And i cant afford to keep replacing them every month or so. Overheating spark plug. And oh yes, REPLACE YOUR MECHANIC. Spark Plug Chart for Reference: Here is a spark plug chart showing all the different ways to “read” spark plugs. Keep an eye out for these symptoms: Misfires. Testing is normally done by the use of a spark plug gauge. 125 thousand miles 25 years old. Sounds like your input or output speed sensor. Typically you will also feel a vibration throughout the vehicle. YourMechanic. It is true that the modern spark plugs are much more durable than the older types but you have to be careful about a false sense of security. I read some more and found I needed new spark plugs. If the engine misfires, it's typically due to an issue in the ignition system. Now the next one, the end of the spark plug is black, dry…and dry is the key, black dry and sooty looking. Granted the reason I am leaning to number 1 is because the number 2 wire (3rd going from right to left) has slightly deteriorated and sits higher than the other 3 and when I pulled them up looked had particles on it. i wanna have an understanding before taking it to the mechanic. please check out my site and let me know if im heading in the right direction, http://beatthemechanic.com/changing-your-spark-plugs/. thanks. Overheating. Ignition System and Spark Plugs. Great article. Engine is Misfiring. Knocking, warning of detonation. Once you get the socket over the spark plug, place your hand over the head of the wrench, grasping the head firmly and pull the handle, hitting it … I would check your fuel filter. Bad Fuel Economy. Does it click or no? Could the spark plugs be the problem? Possible Causes: Typically, these conditions occur over time as lead in the gasoline reacts with the electrode materials. E mail me. A worn spark plug not only wastes fuel but also strains the whole ignition system because the expanded gap (due to erosion) requires higher voltages. During this time your engine will run at a low RPM. Spark Plug Basics. I keep a record of all the work I personally do on my website and im hoping to teach new comers on how they can save money repairing there car on there own. (Hot weather 10w40 oil) It is also possible that faulty spark plugs are causing your battery to drain. 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