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John
John, Master Automotive Technician
Category: Car
Satisfied Customers: 9176
Experience:  ASE A1-A8 & L1 Master GM Tech 40 years experience
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vehicle lacks power at high speed and under heavy engine load

Customer Question

vehicle lacks power at high speed and under heavy engine load conditions
Submitted: 8 years ago.
Category: Car
Expert:  John replied 8 years ago.

HelloCustomer

This condition can be caused by a lean fuel delivery system,due to a restricted fuel filter or a failing fuel pump or excessive exhaust back pressure.Remove an O/2 sensor ,install a pressure gage,run engine at 1500 rpm,pressure should not exceed 1& 1/2 psi.If it does it is usually the catalytic converter plugged up.