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Dave Nova
Dave Nova, Buick Technician
Category: Buick
Satisfied Customers: 1808
Experience:  ASE Master Certification. GM World Class Certification
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Working on a 2001 buick century looses power under load or

Customer Question

Working on a 2001 buick century looses power under load or not when reved up. sensor readings look normal, but I notice when it happens it goes from closed loop to open loop. checked the cat. too. any Ideas?
Submitted: 1 year ago.
Category: Buick
Expert:  FIXITMAN replied 1 year ago.
Hello, my name is***** for the question. If I am not online when you return please give me some time to get back to you. Can you tell me if the check engine light comes on when this occurs? Can you tell me what your fuel trim readings are?
Customer: replied 1 year ago.

No Check engine light, Tried unhooking some things to force the light on but no light. Does come on when the key is on.goes out after starting.

fuel readings start 3. something up to 10. but drop off when goes into open loop.

Expert:  FIXITMAN replied 1 year ago.
Does the engine act like it is misfiring when this occurs or is it just lacking power?
Customer: replied 1 year ago.
Spark is fine no misfires. Pretty sure its fuel pw drops to 0.00 . Have you heard of a bad diode in the alternator causing ecm interference?
Customer: replied 1 year ago.
So I guess your done helping me?
Expert:  FIXITMAN replied 1 year ago.
Sorry, I was sick the last few days. Did you still want some help with this?