Preempting GPF Issues?

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PotteriesRob
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Joined: Thu Jan 09, 2025 1:30 pm

Post by PotteriesRob »

I'm aware that a car that is mainly used for shorter journeys can lead to a clogged GPF, and of the recommended solution of driving above 50mph, engine at 4000rpm then foot off the throttle for five seconds, and repeat until it clears.

Does anyone know whether doing this from time to time if on a longish run before any GPF light appears might help keep the filter clear, or does the clearing cycle only work once the light comes on?

Thanks for any insight.
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PhilHornby
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Post by PhilHornby »

You could try the HEV's strategy of using 4000+ rpm on appropriate hills. Many HEV owners don't seem to like it, but I don't think there have been any reports of a clogged GPF on a (P)HEV ;)
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PotteriesRob
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Post by PotteriesRob »

Thanks for the suggestion Phil. I guess the problem I have is that if I try this suggestion or the one I outlined and don't see the dreaded orange light, I won't know whether my strategy is working or whether I simply wouldn't have had the problem anyway.

As I tend to mainly do short journeys I suspect I'm a prime candidate to suffer a clogged filter, so I think I'll adopt a policy of higher revs from time to time when the engine is truly warmed up and then just keep my fingers crossed 🙂
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Indalo1
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Post by Indalo1 »

PotteriesRob wrote: Tue Feb 04, 2025 10:35 am As I tend to mainly do short journeys I suspect I'm a prime candidate to suffer a clogged filter, so I think I'll adopt a policy of higher revs from time to time when the engine is truly warmed up and then just keep my fingers crossed 🙂
I would suggest that you use E5 rather than E10 fuel, perhaps every other tankful. Alternatively, use a well-respected fuel additive by adding the prescribed dosage every time you fill up with E10.

The increased cylinder temperatures required to burn off the excess carbon in the GPF seem to work well so if you are able to practise the over-run sequence from time to time during your daily driving profile, it might just help avoid the dreaded lamp illumination. I try that on my HEV, not noted for the GPF syndrome, as much as is possible before the petrol engine switches off.

Whether or not that has had any bearing on the fact that I have never thus far encountered the GPF problem, I really can’t say. That aside, I do use E10 with an additive as a matter of course but as I buy most of my fuel from Costco, I do use E5 occasionally. My thinking is that the cost of my fuel usage pales into insignificance compared to the aggravation produced by having the warning lamp illuminate frequently. Costco’s E5 is usually around the price of E10 at most other fuel stations, the E10 obviously cheaper still.
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PotteriesRob
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Post by PotteriesRob »

Indalo1 wrote: Tue Feb 04, 2025 1:51 pm
I would suggest that you use E5 rather than E10 fuel, perhaps every other tankful. Alternatively, use a well-respected fuel additive by adding the prescribed dosage every time you fill up with E10.

The increased cylinder temperatures required to burn off the excess carbon in the GPF seem to work well so if you are able to practise the over-run sequence from time to time during your daily driving profile, it might just help avoid the dreaded lamp illumination. I try that on my HEV, not noted for the GPF syndrome, as much as is possible before the petrol engine switches off.

Whether or not that has had any bearing on the fact that I have never thus far encountered the GPF problem, I really can’t say. That aside, I do use E10 with an additive as a matter of course but as I buy most of my fuel from Costco, I do use E5 occasionally. My thinking is that the cost of my fuel usage pales into insignificance compared to the aggravation produced by having the warning lamp illuminate frequently. Costco’s E5 is usually around the price of E10 at most other fuel stations, the E10 obviously cheaper still.
Thanks for your suggestions and comments.

I am mulling over using E5, though it is obviously fair bit dearer. Maybe I'll follow your example of treating the car to an occasional tankful of the good stuff :D .

I use branded E10, in spite of conflicting opinions about whether supermarket E10 is any different, and since getting the Tucson I have used Redex petrol additive when I fill up, so hopefully this will help. Usefully, just after buying the car Tesco put the Redex on Clubcard offer, at £2.50 down from £5, which is helpful.

Your point about the overall cost of fuel not being the most important consideration is a good one. Not only in the context of any GPF hassle but in overall ownership cost. When I analyse my car costs, fuel comes way down compared to depreciation...
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r0n
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Post by r0n »

I don't think the engine in my car's ever made it to 4000 rpm .

It's run on E5 and trundles around town in 20mph zones quite happily .
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PotteriesRob
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Post by PotteriesRob »

r0n wrote: Tue Feb 04, 2025 7:10 pm I don't think the engine in my car's ever made it to 4000 rpm .

It's run on E5 and trundles around town in 20mph zones quite happily .
Sounds like E5 might be the wise option.

Regarding higher engine revs, whilst I'm anything but a boy racer, I have always given my rev counter the occasional opportunity to explore the heady heights of 4000 or so rpm, usually simply by delaying a second to third gear change when accelerating away from a junction or roundabout. I'm only talking about once a month or so, and I've always felt it blows away the metaphorical cobwebs.
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PhilHornby
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Post by PhilHornby »

PotteriesRob wrote: Tue Feb 04, 2025 8:39 pm Sounds like E5 might be the wise option.
I can't find any evidence that use of E5 will have any bearing on GPF blocking. Let me know if you find some!
(I did find a discussion about E10 having 'excess oxygen' and upsetting O2 sensors. I'm not sure I believed it, but 'excess oxygen' is the condition required for clearing a blocked GPF ... making E10 the better choice :? )
I have always given my rev counter the occasional opportunity to explore the heady heights of 4000 or so rpm
Just keep it below 6500rpm and it will be absolutely fine :)
N Line S Hybrid (HEV).
23 plate - built Nov '22
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