A type 4.0 misfire cop and plug change $325 + 4 hours my time
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A type 4.0 misfire cop and plug change $325 + 4 hours my time
Hi there. We are fairly new to our 2001 s type. At 28k miles new to us it had a slight misfire at idle and at cruising speed 65 on the highway. So first I undertook a permanent windshield seAl which now works perfectly! See my post. We noticed that the more we washed the car the worse the misfire got. Hence I believe tied to moisture. So I bought & NGk pugs. 8 new cop from rock auto. Bought the mid grade cop at 28$ each. NGKplatinum plugs. Replaced all plugs and cops. I pulled the codes prior with a centech reader with no errors. I did notice a fair amount of Rust on each plug, no oil. The plugs were quite pitted but brown in color. I went with the approach to replace all after reading this forum as I don't want engine damage from misfiring and on the cop. Once the covers were off I did not have time to go after the cops and plugs one by one. I also noted that the drivers side cop cover was warped upwards at the aft end near the fire wall. This is where the wires go into the cop. I sealed both of mine with 100% silicone sealant good to 400 degrees. Especially at the back of the covers where the wire goes in. I'll post the plug photos later. No more misfire!!
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