Question about 1989 Nissan 240SX

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Why is my car miss firing i replace the leads

Why is my car miss firing i replace the leads and the coil and spark plugs its a nissan skyline 1982 l20et

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  • yadayada
    yadayada May 11, 2010

    Misfiring When an engine misfires or fires erratically or when one cylinder misfires regularly, the possible troubles are usually associated with the fuel or fuel system, worn parts, or the air cleaner or silencer. In determining what causes a cylinder to misfire, you should follow prescribed procedures in the appropriate technical manual. Procedures will vary among engines because of differences in the design of parts and equipment. Many of the troubles caused by fuel contamination require overhaul and repair. However, a cylinder may misfire regularly in some systems because of the fuel pump cutout mechanism. Some fuel pumps have this type of mechanism so the fuel supply can be cut off from a cylinder to measure compression pressures. When a cylinder is misfiring, check first for an engaged cutout mechanism (if installed), and disengage it during normal engine operation. LOSS OF COMPRESSION.–A cylinder may misfire due to loss of compression, which may be caused by a leaking cylinder head gasket, leaking or sticking cylinder valves, worn pistons, liners or rings, or a cracked cylinder head or block If loss of compression pressure causes an engine to misfire, check the compression pressure of each cylinder. Some indicators measure compression as well as firing pressure while the engine is running at full speed. Others check only the compression pressures with the engine running at a relatively slow speed. Figure 3-38 illustrates the application of some different types of pressure indicators. After you install an indicator, operate the engine at the specified rpm and record the cylinder compression pressure. Follow this procedure on each cylinder in turn. The pressure in any one cylinder should not be lower than the specified psi, nor should the pressure for any one cylinder be excessively lower than the pressures in the other cylinders. The maximum pressure variation permitted between cylinders is given on engine data sheets or in the manufacturer’s technical manual. A compression leak is indicated when the pressure in one cylinder is considerably lower than that in the other cylinders. If a test indicates a compression leak, you will have to do some disassembly, inspection, and repair. Check the valve seats and cylinder head gaskets for leaks, and inspect the valve stems for sticking. A cylinder head or block may be cracked. If these parts are not the source of trouble, compression is probably leaking past the piston because of insufficient sealing of the piston rings



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  • Nissan Master
  • 1,619 Answers

Cap and rotor could be bad. also the points in the distributor could be bad.

Posted on Apr 22, 2010


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