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Jerry Newton
Jerry Newton, Chevy Technician
Category: Chevy
Satisfied Customers: 4508
Experience:  ASE Master Technician, L1, Master GM Technician. Over 20 years of bumper to bumper GM experience.
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My '89 Silverado loses after it warms. The engine was

Customer Question

My '89 Silverado loses after it warms. The engine was rebuilt 45,000 miles, transmission 7 mos. new. MAP is new, fuel sensor new, Radiator new. What can I look for?
Submitted: 1 year ago.
Category: Chevy
Expert:  Eric replied 1 year ago.

HI,

Disconnect the exhaust at the exhaust manifold and test drive with warmed up engine. If power it restored, replace the catalytic converter as it is restricted.

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Customer: replied 1 year ago.
The Catalytic converter is only 3 weeks old. Thanks.
Expert:  Eric replied 1 year ago.

HI,

Is it running rich or lean?

Customer: replied 1 year ago.
Truck has new radiator, transmission, muffler, catalytic converter, electric fan, MAP, EGR, fuel sensor, injectors for throttle body, fuel filter, fuel pump has been checked (it's good.), New battery, Differential checked (good shape), and engine has 45000 mph on rebuilt.
Expert:  Eric replied 1 year ago.

HI,

I will opt out as I am not set for phone calls. If another expert can help, they will respond to the phone call request

Customer: replied 1 year ago.
It's running lean.
Expert:  Jerry Newton replied 1 year ago.

How do you know it's running lean?