4.2 Cold Engine Spark Knock / Detonation
#1
12-29-2005, 01:17 AM
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4.2 Cold Engine Spark Knock / Detonation
2000 F-150 4.2 L V-6 117K Miles
This engine has severe spark knock / detonation when cold. The knock occurs when the engine is under any load such as gradual acceleration. The knock does not occur when revving the engine while in park or neutral. Once the engine reaches normal operating temperature the knock is gone. Also, once the torque converter locks up during cruise, even with a cold engine, the knock disappears. Upon unlocking the torque converter the knock returns. This problem does not generate any fault codes.
Does this engine have a knock sensor? I have looked everywhere and can not locate it.
Does the PCM adjust ignition timing to coincide with torque converter lockup?
I have seen similar problems previously posted. Unfortunately, none of them had any responses.
Does anybody have any suggestions? I appreciate any and all input.
This engine has severe spark knock / detonation when cold. The knock occurs when the engine is under any load such as gradual acceleration. The knock does not occur when revving the engine while in park or neutral. Once the engine reaches normal operating temperature the knock is gone. Also, once the torque converter locks up during cruise, even with a cold engine, the knock disappears. Upon unlocking the torque converter the knock returns. This problem does not generate any fault codes.
Does this engine have a knock sensor? I have looked everywhere and can not locate it.
Does the PCM adjust ignition timing to coincide with torque converter lockup?
I have seen similar problems previously posted. Unfortunately, none of them had any responses.
Does anybody have any suggestions? I appreciate any and all input.
#2
12-29-2005, 07:48 AM
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trvctyrich
Explorer, Sport Trac, Mountaineer & Aviator
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12-09-2011 03:03 PM
