155 THP Techno - Juddering When Idle

[Chris_Blue]

Mine juddered a few times before the HPFP packed up, and the ECU went too.

[lfcrule1972]

Maybe 2hp with a following gust of wind!

Mmmm maybe not, I've been using Shell Nitro+ diesel or whatever it's called and when Jamie stuck mine on the dyno for the initial healthcheck it was running 123bhp ! I don't know how much is attributable to the fuel though

[Colicab85]

I have also had a similar thing happen since my purchase last Wednesday.

My car certainly isn't juddering to the extent where it feels like it's going to stall but there is definite movement when the car is stood at the lights.

It does appear to lessen to the point of it not happening at all when the engine has warmed up. I'm still on the tank of fuel that the dealer put in on purchase, so they could have filled up with shan supermarket fuel.

If this isn't the case however and there is another issue, such as the fuel pump, how do I monitor the fuel pressure to be 48bar? I'm a bit of a car noob so your help is greatly appreciated!

Thanks.

[Colicab85]

Sorry to pester.

I've got my car booked in on friday for another issue and am going to mention the idle stutter. Just wondered if there's anything I can do to diagnose it further to tell the service guy?

[lfcrule1972]

I'm not sure if this is something you can measure easily yourself. Some owners have an app/tool and use their android phones to monitor various readings from their DS3s. I don't know if the fuel pressure is one of them though.

[Colicab85]

I'm not sure if this is something you can measure easily yourself. Some owners have an app/tool and use their android phones to monitor various readings from their DS3s. I don't know if the fuel pressure is one of them though.

Thanks, I'm just gonna tell em that this is something I've noticed and they can hopefully sort it out.

I LOVE my car, and maybe a being a car hypochondriac, but I want to make sure my significant purchase is without faults. Its 10 months old and done 16,000 miles so I'd expect it to be fine. I just don't want to regret my purchase.

[Dangerousfish]

If you're comfortable doing so, give the oil filter, sparks and air filter a once over yourself too. Juddering while idle sounds like the car may be being starved of an important ingredient.

[FLP]

The cause was dirty inlet valves the 2 periods I had a juddering car before. But since now it seems everything is wrong with my engine I cannot guarantee it was only that.

[Colicab85]

The cause was dirty inlet valves the 2 periods I had a juddering car before. But since now it seems everything is wrong with my engine I cannot guarantee it was only that.

Christ almighty. WTF have I let myself in for? How can an engine that's barely 2 years old, in your case, be so faulty, seemingly so often?

I know that we're all invested here and probably here for either the love of the car or advice on faults so this particular demographic is probably skewed somewhat in terms of the overall failure rate but it seems a little high.

Surely there has to be a case where all these faults are covered in the sales of goods act? at least in the UK?

[FLP]

Surely there has to be a case where all these faults are covered in the sales of goods act?

That surely would be the decent thing to do for Citroën. Since selling an engine that can't last 40000km (in my case) is just ripping people of. But that's what I'll find out in the next couple of days, as my dealer is contacting Citroen about my case this week..
I've been a car hypochondriac too since I heard the THP horror stories. Unfortunately it came true in my case. But I'm sure there are a lot of THP engines out there that work just fine.

[Colicab85]

Hi Toxic, yes they did update the ecu when it had it's 10k service a couple of months back. He mentioned that it was a "recall via workshop intervention" which I assume just means that it's something that needed to be addressed whenever the car went in for a service or other work.

What was the outcome for you? Did they replace the HPFP?

[Colicab85]

Cars in now for idle hesitation and bluetooth issues. Lets see what happens.

[Barola]

Cars in now for idle hesitation and bluetooth issues. Lets see what happens.

Did you finally get it sorted out...cold idle juddering?

[WTF]

Did you finally get it sorted out...cold idle juddering?

Do you have similar with your one?

[Barola]

Do you have similar with your one?

Yes similat jiddery/tremor on idle when cold but sometime when hot engine as well. In last 1500 miles changed new parts. hpfp pump, spak plugs, thermostat housing, antifreeze, front/rear brake rotors/pads, professionally cleaned injectors with Wynn's system, engine oil flush, new engine and transmission oil,
cleaned intake valves, changed intake valve seals, new seals at variable camshaft, checked chain stretch it is at 66mm(factory recommends change above 68mm strech), chain was changed at 35k km at dealer car now has 65k km so I did not change
to new chain/guides since there was no strech although I had all new parts ready.

Car runs fine its just has this very very slight and small jiddery feel in the background while idling only like a very light misfiring. I have around 11.7 L fuel consumption per 100km which is pretty high for the 95% city driving I think and winter is not strong here anymore...I will change the O2 lambda sensor next and see it will help
lowering fuel consumption and jiddery idle since I dont have any mistake codes the new lambda sonda might be the solution for the jiddery idle. Otherwise I will just have to live with it as I read on some Mini forums it is THP engines "character" to have jiddery idle