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what causes the double humps?
[1983 Ford F-350, Engine/Propulsion Waveform] rel comp This rel comp is from an 83 F350, but I have seen similar results from many other good running vehicles. What causes the double humps on the compression stroke? Login to read more.
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| Engine | 7.5 L |
| Trans | 4-speed Standard |
Vehicle Data
1983 Ford F-350 7.5L
| Engine | 7.5 L |
| Trans | 4-speed Standard |
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