Depends on how massive the air leak is... depends on were the leak is,,, depends on the engine temp,,, depends on whether its affecting one cylinder are all of'em,,, depends on were the leak is in the airflow stream...
Yes its difficult to find a air leak,,, a smoke machine is a must have tool to find them most of the time... After I brought one I could not live with out one...
If the leak is with in the parameter of the PCM to adjust for it you are not gonna find it with old shad tree ways unless you got a real sharp eye...
Its called fuel trim Google it,,,, Long term (LTFT) and sort term (STFT)...
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Today's Featured Article - New Life for an Old Allis - by Tyler Woods. My friend Jon, has an old '39 Allis Chalmers B. He thought it a marginal tractor that had long since served its time. She smoked terribly and never had much power but he couldn't afford another so he was limping along with what he had. Jon's Allis has a small front loader and though it doesn't carry much, it serves his needs. It was the hard starting and low power that made him think it was time to replace the old girl. Jon called me to help him discover why his tractor wouldn't start
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