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Relative Compression and First Look Sensor

  • Chad
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11 May 2019 14:44 - 11 May 2019 14:46 #29526 by Chad
Misfire Cylinder #2

Yellow Trace is an Amp Clamp around the Battery Cable. Red Trace is a Secondary Ignition Probe on the #2 plug wire. Green Trace is a First Look Sensor on the Oil Dipstick Tube.


"Knowledge is a weapon. Arm yourself, well, before going to do battle."
"Understanding a question is half an answer."
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Last edit: 11 May 2019 14:46 by Chad.

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12 May 2019 12:29 #29563 by Tyler
Replied by Tyler on topic Relative Compression and First Look Sensor
Nice. B) Looks like someone is getting a long block! Or a rebuild, I guess.

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12 May 2019 12:38 #29566 by Chad
Maybe. This car came in for a Transmission. :dry: I decided to check out the misfire, first.

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"Understanding a question is half an answer."

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12 May 2019 12:42 #29567 by Tyler
Replied by Tyler on topic Relative Compression and First Look Sensor

Chad wrote: Maybe. This car came in for a Transmission. :dry: I decided to check out the misfire, first.


Oh my. :ohmy: Very nice find. This is definitely the kind of thing you need to know about BEFORE doing repairs.

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15 May 2019 08:08 #29657 by sgtdills
Replied by sgtdills on topic Relative Compression and First Look Sensor
Just out of curiosity, what made you want to check the dipstick tube with the first look? Or did you perform the relative first then added the first look after seeing the loss of compression?

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15 May 2019 11:37 #29670 by Chad
Clear Flood mode (accelerator peddle to the floor, then crank, disables fuel). On a long crank, I could HEAR a rhythmic pattern. Cranking should me a smooth consistent sound. Once I HEARD it, I went to the Relative Compression test. Then, added in the FLS.


"Knowledge is a weapon. Arm yourself, well, before going to do battle."
"Understanding a question is half an answer."

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