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2005 F150 4.2L (crank, no spark)
- Gcam
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2 years 5 months ago #61336
by Gcam
2005 F150 4.2L (crank, no spark) was created by Gcam
Question: So i tested 2 out of the 3 control wires coming from the PCM at the coil pack (waste spark system). I did this test with the original coil pack and a new coil pack. The pictures below shows the reading I'm getting when checking for control from the PCM. The A1 reference line is just a pre-bult set that is suppose to show what the primary side should look like.
The time frame is based on 2ms. Based on what im seeing across 2 different coil packs it looks like the transistor is maybe not holding the ground long enough for the coil to build charge? Or do i need to hook up a clamp amp to rule this out? What are the chances that all 3 transistors are bad inside the PCM?
The time frame is based on 2ms. Based on what im seeing across 2 different coil packs it looks like the transistor is maybe not holding the ground long enough for the coil to build charge? Or do i need to hook up a clamp amp to rule this out? What are the chances that all 3 transistors are bad inside the PCM?
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