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mtrujillo01@gmail.com



Member Since: 16 Sep 2024
Location: New Mexico
Posts: 3

United States 2012 Range Rover Supercharged 5.0 SC V8 Fuji White
'12 supercharged running rich after HP fuel pumps replaced..

2012 SC L322

Replaced the high pressure pumps after getting the dreaded restricted performance mode and sputtering misfires etc etc. That fixed that issue but now the vehicle is running rich. Getting codes 0172 and 0175 so running rich on both banks.

I did an oil and filter change. I reset the adaption values with GAP Tool. I have taken the air filters out and run it, no change. Then went ahead and replaced the filters anyway. I've cleaned the MAF sensors a couple times. I have replaced the upstream (pre-cat) O2 sensors. im hoping its not the injectors, but is it likely that the injectors would go bad on both banks at the same time after pump replacement? and wouldn't I see misfire codes or other codes?

I have the GAP Tool so I want to do some info logging and hopefully post them here. What items should I monitor and record in the logging? At quick glance, the O2 sensors seem to be reading right (fluctuating up and down), mass air seams to be reacting with throttle and rpms and in the right range.... what else should I be looking at and what would be the correct readings?

Post #700187 16th Sep 2024 4:04pm
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dingg1



Member Since: 29 Jun 2013
Location: PORTUGAL
Posts: 1339

2007 Range Rover Vogue SE 4.2 SC V8 Stornoway Grey

How many miles have you put on it since the pumps change out?

May be still settling in to the changes and fuel trims still tuning in

Post #700189 16th Sep 2024 4:16pm
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mtrujillo01@gmail.com



Member Since: 16 Sep 2024
Location: New Mexico
Posts: 3

United States 2012 Range Rover Supercharged 5.0 SC V8 Fuji White

thank you for the response, I've put close to 300 miles on it now after what I've done and checked so far...

I'm hoping I didn't get a crappy set of faulty pumps.... although, that would be my luck. lol.

Post #700194 16th Sep 2024 5:56pm
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mtrujillo01@gmail.com



Member Since: 16 Sep 2024
Location: New Mexico
Posts: 3

United States 2012 Range Rover Supercharged 5.0 SC V8 Fuji White

running rich, all lines seem to be moving except that light blue. could this be a faulty downstream (after-cat) sensor?

Post #700216 17th Sep 2024 12:10am
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dingg1



Member Since: 29 Jun 2013
Location: PORTUGAL
Posts: 1339

2007 Range Rover Vogue SE 4.2 SC V8 Stornoway Grey

Did you time the fuel pumps correctly?

I reckon that's what is wrong here, I remember changing an injection pump on a bmw 325 tdse and that was quite difficult to get spot on....

Post #700223 17th Sep 2024 7:51am
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Gsxr1250dave



Member Since: 20 Oct 2018
Location: London
Posts: 882

England 

Iv never heard of timing a fuel pump for a petrol engine before it just pumps fuel to the fuel rail

Post #700238 17th Sep 2024 10:10am
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dingg1



Member Since: 29 Jun 2013
Location: PORTUGAL
Posts: 1339

2007 Range Rover Vogue SE 4.2 SC V8 Stornoway Grey

Your totally correct, this muppet (me) didn't notice it was for a 5.0 sc

Apologies.....

Post #700241 17th Sep 2024 10:20am
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dhallworth



Member Since: 10 Oct 2011
Location: Glasgow
Posts: 3060

United Kingdom 2012 Range Rover Autobiography TDV8 Baltic Blue

Drain the oil and check to see if it smells of fuel.

There was a member on here that had a high pressure fuel pump that was leaking internally and allowing fuel directly into the oil which caused the ECU to think it was constantly running rich.

Your downstream O2 sensors are only monitoring the efficiency of your cats and have nothing to do with controlling the mixture.

David. 2002 4.6 Vogue SE - Alveston Red with Lightstone Leather
2007 Range Rover Supercharged in Java Black with Ivory Leather
2012 Range Rover 5.0 SC Autobiography in Indus Silver with Jet/Ivory Interior
2012 Range Rover 4.4 TDV8 Autobiography in Baltic Blue with Sand Interior

Post #700293 17th Sep 2024 7:34pm
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mgrover



Member Since: 03 May 2020
Location: Leeds
Posts: 394

United Kingdom 2011 Range Rover Vogue TDV8 Santorini Black

I would check if there's a timing mark for the fuel pump

I've seen other cars require it. Its actually a sport Sad

Not anymore, 4.4 TDV8 now Very Happy

Post #700427 19th Sep 2024 8:09pm
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