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With Ignition coil and resister new and still have weak spark and engine wont start?
Wiki User
∙ 16y ago
If it's a HEI system you probably have some kind of problem with the control module. If it's an older engine using points I'd look first at the points and condenser.
The resistor is only used when the engine is running. The starter shunts full voltage to the coil during startup to provide a little extra spark. In effect the starter bypasses the resistor for you, or at least that's the plan. Verify that the starter is doing that before you spend too much effort on anything else.
Wiki User
∙ 16y ago
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What do you do when you turn the ignition key on to start on a 1984 Mercury Capri 5.0 but it does not stay running when the ignition is brought back to the run position?
replace the balist resister replace the balist resister
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Why will the engine turn over but not start in a 1996 Ford Taurus?
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Why does the car start but not run?
In answering the question, "Why does a car start, but not run?", I have no information on year or make. If the car has a 12 volt system and is a pre-computer model, a likely answer would be due to a faulty ballast resister in the ignition system. The ballast resister is wired to the positive side of the ignition coil. When the engine is cranking, full battery voltage is applied to the coil primary winding to provide the hottest possible spark for the plugs. Once the engine begins to run, voltage is applied to the ballast side of the resistor, reducing applied voltage to the primary circuit, thus prolonging life of coil and distributor points. This explains why the engine will start but cut off as soon as the key is returned to the run position. To prove the diagnosis, a simple trick is to run a small jumper wire from the positive terminal of the battery to the plus side of the ignition coil. If the engine starts and continues to run, the ballast resister needs to be replaced.
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A diesel engine has no spark plugs. Because the air is so compressed and hot at the top of the stroke, the fuel ignites right away when it is injected. This is why a diesel engine is called a "Compression Ignition" engine and gasoline engines are called "Spark Ignition" engine. This also means that there are no ignition breakers, ignition coils, distributors and ignition wires to go bad. This allows diesel engines to start no matter if it is dry or rainy and wet. The immense compression creates the heat that ignites the fuel. On cold days a glow plug may be necessary to heat the combustion chamber enough to start the engine.
What if your engine cranks but won't start what should you do?
check for spark at plugs,coil.check you are getting fuel check ignition condensor
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