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My h3 hummer's engine begins to power down at 70 mph.

Customer Question
My h3 hummer's engine...

My h3 hummer's engine begins to power down at 70 mph

Mechanic's Assistant: How many miles are on the car? Is it an automatic or a manual transmission?

110000, automatic

Mechanic's Assistant: What year is your H3?

2009

Mechanic's Assistant: Are you fixing your H3 yourself? What have you tried so far?

Not myself, I took it to the dealership and they replaced the throttle body, but that did not solve the issue

Submitted: 4 months ago.Category: Car
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Customer reply replied 4 months ago
Posted by JustAnswer at customer's request) Hello. I would like to request the following Expert Service(s) from you: Live Phone Call.
Customer reply replied 4 months ago
Let me know if you need more information, or send me the service offer(s) so we can proceed.
Answered in 3 hours by:
3/10/2018
Auto Mechanic: eric remington,
 replied 4 months ago
eric remington
Category: Car
Satisfied Customers: 874
Experience: mechanic/service advisor at topline auto
Verified

hELLO WHEN YOU SAY POWER DOWN? DOES IT FEEL LIKE THE TRANSMISSION? OR THE ENGINE? LACKS POWER? WILL IT GO PAST 70 MILES AN HOUR?

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Auto Mechanic: eric remington,
 replied 4 months ago

NO RESPONSE OR HESITATION? PROBABLY BOTH....ARE THERE ANY CODES IN ENGINE MANAGEMENT SYSTEM? EVERY ENGINE NEEDS FUEL AIR SPARK COMPRESSION AND EXHAUST. COULD BE LOW FUEL PRESSURE BUT COULD BE RESTRICTED EXHAUST. AS IN A CATALYTIC OCNVERTER THAT IS PARTIALLY CLOGGED. DOES VEHCILE HAVE AN EXTERNAL FUEL FILTER PROBABLY NOT IN 09 FUEL PRESSURE EEDS TO BE CHECK AND EXHASUT SYSTEM AND ENGINE MANAGEMENT SYSTEM NEEDS TO BE CHECKED WHILE DRIVING. A BAD ASENSOR LIKE A MASS AIR FLOW SENSOR COULD BE THE CULPRIT AS WELL

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Auto Mechanic: eric remington,
 replied 4 months ago

PLEASE RATE ME AS I AM COMPENSATED THRU YOUR RATING....

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Auto Mechanic: eric remington,
 replied 4 months ago

hello hows it going

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Auto Mechanic: eric remington,
 replied 4 months ago
Hello need help
Ask Your Own Car Question
Auto Mechanic: eric remington,
 replied 4 months ago

hello hello

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