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C6 2.2 HDI Manual Intermittent 'baulk' when driving |
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Ranger12
 
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   Member No: #4492
Location: Somewhere in the darkest recesses of England |
My C6 has done just over 150k, and has a progressively worsening problem that gives my heart a shock whenever it happens. When I am driving, particularly under mild to vigorous acceleration out of corners, but occasionally in a straight line under gentle to hard acceleration, the car 'baulks' as if the engine had suddenly died/seized, but in a second or less, revives and then carries on as normal. The effect it has is quite a shock for me, and for passengers, as the whole car feels like it was momentarily stopped (myself and passengers are momentarily moved forward as if the bakes had been stabbed at). Sometimes it will cause speed limiting/cruise to fail, but not always, and there are no warnings under Lexia/Diagbox/Launch x431 Pro Elite/or car's own log. It tends to happen in the 1700 - 2600 rev range (where it spends much of its time), and yesterday I found that I can trigger it almost all the time when coming off a roundabout or turning right, though it has also done it when turning left too. Most occurrences have been whilst warming up, and really rough roads, but has also done it at mid-range speeds 50(ish) when fully warmed up, on reasonably smooth roads. On occasion, thinking it might be a fuelling issue I revved the engine to max, which it did without hesitation or fault, and even tried full acceleration through the gears up to 80mph in a straight line, with zero issues. Tick-over is diesel-smooth, and the engine has never died with this. It is most common coming out of bends with average day acceleration on roughish roads (particularly when trying to maintain smoothness in driving style), but I have also towed a caravan 200 miles and back without issue. I did notice yesterday that it also can appear when just trying to maintain a set speed in the 1700-2500 rpm range, with a small amount of acceleration. I have zero recorded warnings, even though yesterday it had a record number of such events, which has led me here, suspecting something very serious is about to occur, which I am desperate to get to the bottom of and fix, as this is my only transport, which I also need in my caring role. The car had a new clutch & dual mass flywheel 3 years ago, at which time I became aware of the gearbox being a little whiney through the gears, particularly 4th, but it is minor, and has a very small leak. There is a bit of play in the inner cv joint mounting, and a bit of side-to side play (small) in the gear lever, suggesting the lateral engine mounts are worn too. I also had the cambelt done around this time too. I am worried that this maybe a gearbox issue, I know it is worn from running too long with incorrect suspension settings from the previous owner (when I used to get to 70mph my wheels would wobble even though balanced, I then set the suspension myself so that the driveshafts are level, not angled at normal suspension height, and that problem vanished, which indicates worn gearbox bearing). I think it might be wobbly driveshaft inner bearing mounts in the gearbox causing partial locking of cv joints, but there is no noise, and my cv joints/steering are smooth normally, but as I have also had my DPF warning come on a while a couple of months ago, which I treated successfully with Wynns DPF Cleaner (highly recommended as it has worked every time for me, and is used by many taxi/uber drivers in my town). I also wonder if this could be a symptom of sticking turbos (though power loss isn't evident, just a momentary, car-jerking baulk), or sticking EGR valves, maybe even an incorrect setting for the DPF. On that point, what setting should I have for my 2007 2.2 HDI Manual DPF? I read elsewhere on the site that the 2.2 manual doesn't have a pump and wire setup, and I think mine is set at that, which might be a cause. I don't know what that setting should be set to, so would like this set correctly, even if it has nothing to do with my current issue. Again I would stress that none of these issues have resulted in any DTC codes, which is making this issue extremely difficult to diagnose, and I really could do without the shock it gives my heart when it happens - it feels like the car is about to completely lock-up, but then that vanishes as if nothing happened, in a second or less, leaving me with a bad feeling of impending doom. It feels like a serious issue, and I would rather not diagnose it through a complete failure, as that may then be terminal for my C6, and I already have a dead 2.7 (and a good ex-Xantia 3.0L 24-Valve V6 Petrol engine I'm toying with installing into that). If anyone knows what this is, please respond, I am keen to get this sorted asap, as is the 82 year old lady I care for, who is dependent on this car, and absolutely loves it too. |
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Dan595
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 Member No: #299
Location: Wiltshire |
I had a very similar fault on my 2.2 - it sounds identical. Eventually, after a year or so of this very intermittently showing up, the car threw a fault code. The throttle body was full of oil and would occasionally snap closed, hence starving the engine of air for an instant. I replaced the throttle body with one from a scrapped Evoque (bought on eBay for about £20). Very simple to fit. Problem solved. I'm not saying yours has the same problem, but it sounds identical to the fault mine had. Good luck. |
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Ranger12
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Member No: #4492
Location: Somewhere in the darkest recesses of England |
Thank you Dan595, that makes a lot of sense, as soon as I read what you wrote, that seemed right, and in my mind, fits the behaviour pattern exactly, and that has given me a good start on resolving this issue. I have for the moment sprayed a contact cleaner straight into the throttle body pipe-work whilst running (I removed the pipe section just after the air-flow sensor near the air-box), in the hopes of helping to remove any excess oil that may have accumulated, the car revved quite hard on that stuff, threw up a DTC fault telling me the anti-pollution device was faulty, which was easily cleared and hasn't returned (and was expected with what I did), but further driving will reveal if this has helped/cured the issue or if this is a sign, like your, that it is on its way out, and will need replacing. I have changed my settings to 'ecu controlled' instead of 'pump with wire' for the DPF system, and will see if/when this problem re-occurs. Regarding replacement, it looks to me that the throttle body is way down the back of the engine, and not so easy to get at, so wondering if it is an easy job as you say, or if I am looking at the wrong section (with the mid-pipe section removed from between the air-box and throttle-body pipework, I can look into it and see two large orifices, one going straight down, the other going back and down, with visible cream-coloured plastic in the back of the pipe. I think it is the back section that leads to the throttle body, and when I sprayed cleaner into both, it was this one which picked up the revs, so have assumed this must be the pipe-hole to the throttle body. All this pipe-work is secured with non-reusable clips, and has a couple of smaller bore pipes coming off it, going into the back of the engine. For me this looks like a good couple of hours to safely remove all this piping, and then awkward, as I just cannot see the throttle-body itself, either from viewing down the pipe-work, or externally - perhaps the job looks worse than it actually is, but I could do with either correction, or encouragement on the difficulty. I take it the Range Rover Evoque you got your throttle body uses the same unit, and the same 2.2 engine as the 2.2 C6? (I know for example that the 2.7 engine is used in Land/Range Rovers/Jags and other PSA vehicles, and the 3.0L 24-Valve Petrol engined C6's come from the 3.0L V6 Xantia Exclusive for example). Thank you so much for responding, you have eased my worry somewhat now that I am sure it is not a serious issue (i.e broken engine gearbox scenario). |
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MGmike
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   Member No: #3151
Location: South Queensferry |
Take a look at this - Click Here - The air doser (throttle body appears to be on the outlet of the intercooler. I guess follow the pipe and you should find your way to it. Best of luck |
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