Car Repair and Auto Assistance
You are driving down the street and then feel a feeling you instantly recognize, but just as quickly ignore. The motor stumbles for a moment then regains its pace. Just as soon as the motor settles down, the misfire reappears, and you're stuck with the sinking feeling that accompanies all automotive problems, "Oh No! I don't have the time or the dough to spend on a truck fix!"
There are many items that can cause the engine to miss or run roughly. The prime culprits are basic: spark or fuel. These habitually manifest in spark plugs, plug wires, the coil(s), or the fuel-delivery system. To determine which of these is instigating your trouble you should start your diagnosis with an under hood checkup. Deficient ignition wires, inhibited injectors, or motor mechanical malfunctions are all likely.
Originate your diagnosis with an under the hood examination. Look for crushed or cracked vacuum hoses. Inspect the spark plug wires for chafing or signs of arching to the engine block. If the automobile is due for routine service, this should be done before to spending too much time on an investigation. A complete tune-up including spark plugs, spark plug wires, distributor cap and rotor (if so equipped), fuel filter, and air filter will go a long way in patching up the most familiar problems. If a misfire is still present after a complete tune-up is performed, then an examination of engine mechanical problems may be unavoidable.
A vacuum test using a vacuum gauge should be completed. An engine should draw at least 15 pounds of vacuum at idle when connected to a vacuum hose that is connected to the intake manifold. The vacuum should be smooth and not fluctuating. A severely fluctuating vacuum gauge is an sign that there is a valve train impairment, such as a not working valve or slipped timing belt. Retarded ignition timing can cause unusually bad motor vacuum. A compression check should be completed on the motor to determine if lower than usual compression is present in any cylinder.
Refer to a manufacturer's specific service manual for compression specifications. As a general rule, the compression should be above 120 PSI and the lowest cylinder should be at least 80% of the highest cylinder. If the above tests do not indicate a failure, a diagnosis of the fuel and ignition system must be effected. There are other more unfortunate causes: computer or wiring problems, breakage in the rotating mass (pistons, rods, and crank bearings), valves and the heads can fail or distort. Cooling difficulty might permit overheating, and any number of gaskets could have pushed.
Most are rare and were probably caused by your failure to take care of simpler problems in the ignition or injection. If you are unable to perform the tests vital to finger the exact issue of the misfire it is without question most desirable to contact a notable vehicle repair shop and have them check out your wheels. Guessing at the problem and throwing parts at it will only serve to run up your expense and possibly make it more difficult to determine the true cause of the problem with your car. Save yourself time and cash by effecting maintenance according to manufacturer's recommendations and take it to your nearest Auto Service Experts repair facility for a free diagnostic whenever you have any van performance problems.
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