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Relative Compression and First Look Sensor

  • Chad
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4 years 11 months ago - 4 years 11 months ago #29526 by Chad
Relative Compression and First Look Sensor was created 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."
I have learned more by being wrong, than I have by being right. :-)
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4 years 11 months ago #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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4 years 11 months ago #29566 by Chad
Replied by Chad on topic Relative Compression and First Look Sensor
Maybe. This car came in for a Transmission. :dry: I decided to check out the misfire, first.
"Knowledge is a weapon. Arm yourself, well, before going to do battle."
"Understanding a question is half an answer."
I have learned more by being wrong, than I have by being right. :-)

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4 years 11 months ago #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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4 years 11 months ago #29657 by JarheadDiagnostics
Replied by JarheadDiagnostics 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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4 years 11 months ago #29670 by Chad
Replied by Chad on topic Relative Compression and First Look Sensor
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."
I have learned more by being wrong, than I have by being right. :-)

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