GolfGTIforum.co.uk
Model specific boards => Golf mk7 => Topic started by: Worker on 14 April 2024, 06:33
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I have a golf gti mark 7 2019. It has done 10000 miles
I was getting up to 52 mpg for a long time and during the last 6 months this has reduced to 33 on a run driving at 55. Driving on a regular route. When in fifth or sixth gear it feels like it is in third gear. In fact on a shorter run I get better mileage. I have never experienced this before. I have been the owner of four Gti during the last 35 years! I have the same driving style.
It has been checked out and no faults found
The tyres are inflated to 38.
The brakes have been cleaned
No faults show on the dash.
I am informed there is nothing wrong with it! That they are thirsty cars!
Please could someone help me?
Thank you.
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Check to see if you have a caliper sticking.
Take the car for a short drive and avoid using the brakes as much as possible. Just a few miles should be enough. Then go around and feel each brake disk (carefully) for heat. If any are really hot, you have a sticking caliper. It's very common with low mileage use.
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Have a read of this.
https://www.golfgtiforum.co.uk/index.php?topic=290349.msg2665427#msg2665427
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I would like to add could it be gp regen blocked due to the short trips I make?
Would the warning light come if this the case?
Thanks
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I would like to add could it be gp regen blocked due to the short trips I make?
Would the warning light come if this the case?
Thanks
GPF regeneration was my initial thought. In addition to your car feeling like it’s in a different gear to the actual gear and your poor fuel consumption, is your car displaying any of the other symptoms that might indicate a forced GPF regeneration is in progress? (See list in my post - reply #6 - at the link posted by @Adam T in reply #2 above). During a forced GPF regeneration, additional fuel is used to help raise the exhaust temperature and neutralise accumulated particulate matter. When my car (a 2020 2.0 litre Polo GTI+) is performing a forced GPF regen, the additional fuel usage results in my mpg worsening by around 30-35% until the regen has finished, after which mpg returns to normal levels.
I don’t think VW’s have a warning lamp in the instrumentation display to show when a GPF regeneration is taking place (my car certainly doesn’t) even though I think some owner’s manuals for various VAG brands might make reference to a warning lamp.
If your car is attempting to perform a forced GPF regen and you complete your your journey before it’s finished (quite likely if you’re doing a high proportion of short trips), then it’ll recommence the regen process during the next - and subsequent - ignition cycle(s) until the process is complete. Assuming that’s what’s happening with your car, then I’d recommend taking it on a decent length run so the engine can get up to optimum operating temperature and trying the ‘engine braking’ method to help clear the GPF; details in my post #6 at the linked discussion topic referred to above.
Please update this discussion topic for the benefit of other forum members once you’ve done the above.
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Gpf regen is a distinct possibility, mine gets a noticeably noisier exhaust note too and yes, the mpg plummets. Also find the fans still running after turning the engine off. Take it for a good long run and see if that clears it. A couple of hours steady on the motorway should do it.
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Thank you. This is invaluable to me. I am away until the end of the week. I will get back to everyone when I have done what is suggested.
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SRGTD’s advice was 100% spot on, I noticed the difference after about 10 miles.
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Thank you for your support and advice. It was invaluable.
I took it along a dual carriageway and drove at 70 mph and then dropped to 30 mph without braking. I did this about ten times! It worked. Now back to normal.
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Thank you for your support and advice. It was invaluable.
I took it along a dual carriageway and drove at 70 mph and then dropped to 30 mph without braking. I did this about ten times! It worked. Now back to normal.
Good to hear it worked!
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Must do this myself, had a good run there the other day and was back at 38mpg the day after I can barely get 32mpg. Strange though as I typically have nice long runs 40+ miles, although maybe not that the right speed to let it regen.
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Update did the long drawn out engine braking albeit just from 70mph down to 40-50mph, over the course of 114 miles today averaged 36mpg, and then after a refuel 43mpg over 13 miles.