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In a 1993 Ford 4.6L what might cause late spark advance timing late during full throttle?


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2015-07-15 19:51:51
2015-07-15 19:51:51

You may have a defective knock sensor located in the side of the engine block.

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Bad points , leaking or fryed coil, shorted wires leading to timing device.

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it could be your tps throttle positioning sensor or it could be timing advance or low fuel presure these are some things ive checked on mine ive had a little luck with them but havent mastered the problem

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It depends on if you have a carburetor or fuel injection but it is probably in the throttle body. You could have trash in your throttle body or the throttle body is worn out.

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The throttle position sensor (TPS) keeps the PCM informed about throttle position. The PCM uses this input to change spark timing and the fuel mixture as engine load changes. A problem here can cause a flat spot during acceleration (like a bad accelerator pump in a carburetor) as well as other drivability complaints.the throttle position sensor (tps) tells the computer where you have your foot while driving ( half throttle or quarter ect.)

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Whenever someone has trouble timing a Chevrolet V8 engine, the cause for the problem generally points to a stretched or worn out timing chain & gears. Make sure that all timing advance mechanisms are disabled. Depending on the age of the vehicle in question it may be as simple as plugging the vacuum line to the distributor, or as difficult as disabling the advance circuit of the engine control unit. If all advance systems have been disabled and you find it difficult to set the timing accurately, inspect the timing chain for stretch.


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