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Have a reduced engine performance message, 109k automatic,

Customer Question
Have a reduced engine...

Have a reduced engine performance message

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

109k automatic

Mechanic's Assistant: What is the make/model/year of your car?

Range rover sport 2009 supercharged

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

Replaced fuel pump, ignition coils, cleaned mass airflow sensor and throttle body

Mechanic's Assistant: Anything else you want the mechanic to know before I connect you?

No error codes regarding this from the computer scan, it happens normally after running on higher rpm's and car shakes and vibrates on idle as well.

Submitted: 6 months ago.Category: Car
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Answered in 5 minutes by:
12/18/2017
Auto Mechanic: Chad Farhat, ASE Certified Technician A6 - Electrical / Electronic systems A7 Heating / Air conditioning systems replied 6 months ago
Chad Farhat
Chad Farhat, ASE Certified Technician A6 - Electrical / Electronic systems A7 Heating / Air conditioning systems
Category: Car
Satisfied Customers: 5,626
Experience: Owner at Carolina Auto Service & Sales , 20 years Experience in Foreign & Domestic Vehicles
Verified

Hi, I'm Chad. Welcome to JustAnswer. I'm reviewing your question and I will be posting your reply ASAP.

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Auto Mechanic: Chad Farhat, ASE Certified Technician A6 - Electrical / Electronic systems A7 Heating / Air conditioning systems replied 6 months ago

Hey how are you,I will try to help you with this issue

what scanner was used to scan for codes

do you have live data scanner that read fuel trim readings ,long term and short term ?if you do what are they

was ckp sensor checked , they are common for Failing and Not Setting a fault codes ?

lets start here and we go from there

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Customer reply replied 6 months ago
autologic scanner was used.. i dont have any fuel trim readings. ckp sensor was not physically checked.
Auto Mechanic: Chad Farhat, ASE Certified Technician A6 - Electrical / Electronic systems A7 Heating / Air conditioning systems replied 6 months ago

that will make it hard if no fuel trim to confirm few things ,if you can not get them

vacuum leaks around intake ,maf sensor or ckp sensors will cause the intermittent ,I suggest a smoke test to check leaks ? clean tb body if you have not already , replace ckp sensor if no tools to check signal , fairly cheap on ebay .and clear faults and retest

You are very welcome :)

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Auto Mechanic: Chad Farhat, ASE Certified Technician A6 - Electrical / Electronic systems A7 Heating / Air conditioning systems replied 6 months ago

also when unplugging ckp connector ,inspect connector pins for burned marks, backed out pins ,water intrusion making poor connection,get crc electrical contact cleaner spray before plugging new one

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Chad Farhat, ASE Certified Technician A6 - Electrical / Electronic systems A7 Heating / Air conditioning systems
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