Misfire on cylinders 1,2,3, and 4 on a 302HO V8 1992 Mustang? - Mustang Evolution

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Old 12-20-2011, 02:15 AM   #1
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Misfire on cylinders 1,2,3, and 4 on a 302HO V8 1992 Mustang?

The car misfires on all cylinders on the passenger side (1 through 4). Cylinders 5-8 hit perfectly. I did a compression test and cylinders 1 and 2 read about "105psi". 3 and 4 read about "90psi". Could this be a possible head gasket issue or valves? The plugs are black and wet. Cylinders 5 through 8 look normal. Cylinders 1 through 4 ARE getting spark to the cylinder(new plugs/wires) Changed Distributor Caps and still doing the same thing. Coil is good (MSD) Gas is getting to all cylinders.
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Old 12-20-2011, 02:40 AM   #2
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Misfire on cylinders 1,2,3, and 4 on a 302HO V8 1992 Mustang?

I'm assuming it's fuel injection engine. When you did compression test did you shut off fuel pump and check all 8 cyls. with throttle open and cranked same amount of turns? If not you wont get correct reading. Have you done an obd scan to check for trouble codes? Spark plugs black and wet can be injector problem delivering too much fuel which are computer controlled, so before digging into engine suggest an OBD scan for codes and to read sensor parameters first. Usually compression should be around 150psi all cylinders.
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Old 12-20-2011, 02:47 AM   #3
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Misfire on cylinders 1,2,3, and 4 on a 302HO V8 1992 Mustang?

did u change the plugs? got the right fireing order? dis cap go moisure in it? any bad spots in the plug wires? is the fire timeing right?
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