207 1.6 petrol turbo thp misfires

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matspiderpig85
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207 1.6 petrol turbo thp misfires

Unread post by matspiderpig85 »

ImageHi, wondering if anyone has had misfiring problems with this engine? So far I've replaced spark plugs, coils, camshaft and crank sensor, once I clear the codes it seems to drive fine, happens more on cold start up but can happen when warm too, no signs of head gasket failing that I can see. I have attached live data. Was running lean but now I've put a new boost sensor on and cleaned the oxygen sensor the ltft has dropped down to just over 10% was at 21 🫠 was thinking of replacing intake and oxygen sensor but before I do I'm just wondering if anyone thinks there is any point or could it be timing? Codes I get are for misfires which can be any cylinder, sometimes get an air/fuel mixture code too, seems to be using a bit more fuel, no noises coming from engine
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Last edited by matspiderpig85 on 30 Dec 2024, 09:09, edited 1 time in total.
PaulC5
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Re: 207 1.6 petrol turbo thp misfires

Unread post by PaulC5 »

Have a read of this including the linked topic viewtopic.php?t=84365
Have you replaced the fuel filter if it has one ?
If you list the fault codes it might help.
matspiderpig85
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Re: 207 1.6 petrol turbo thp misfires

Unread post by matspiderpig85 »

Will give it a read, I don't have a fuel filter unfortunately. I did buy one that apparently fitted my car then was told my car doesn't have one 😅 sorry thought I posted the codes I'll do that now
gwest
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Re: 207 1.6 petrol turbo thp misfires

Unread post by gwest »

Back to basics really. What do the spark plugs look like? What is the compression? How many miles on the engine? Have the inlet valves and ports been cleaned?
matspiderpig85
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Re: 207 1.6 petrol turbo thp misfires

Unread post by matspiderpig85 »

Spark plugs and coil packs new, have checked them since replacing them and they look fine. Not sure on compression yet, it's got 88,000 miles, I've not had the valves and ports cleaned. I'll have a look online see if it's a job I can do myself. Before replacing the sensors that I have already it would struggle to idle from cold, not starts up fine, it's usually when I've set off driving going into 2/3rd years I'll get the misfires
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xantia_v6
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Re: 207 1.6 petrol turbo thp misfires

Unread post by xantia_v6 »

This guide seems reasonable for DIY carbon cleaning https://www.nomaallim.com/decarbonizing ... ngine.html but access to the ports ant the back of the engine is typically difficult.

Based on previous reports, I would guess that your symptoms are more typical of a stretched timing chain.

I would suggest that you look at the diagnostics data, particularly fuel, timing and air trims to see if anything looks odd.
gwest
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Re: 207 1.6 petrol turbo thp misfires

Unread post by gwest »

This was the state of my Citroen DS3 THP150 at 130k km. And it was not throwing up error codes but was not responding well to full throttle.
my own photo
my own photo
matspiderpig85
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Re: 207 1.6 petrol turbo thp misfires

Unread post by matspiderpig85 »

This is codes and readings from today, can't afford a new timing chain at the moment. Wrong time of year ha
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gwest
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Re: 207 1.6 petrol turbo thp misfires

Unread post by gwest »

You have coherence between the inlet camshaft and crankshaft positions which is encouraging for the timing, but it would be good to recheck the timing anyway. And how much extension is left in the piston in the cam chain tensioner.
Cleaning the inlet ports and valves is a low cost labour intensive job if you do it yourself. Undoing the lower rear engine link and the upper RHS engine mount allows you to move the engine forward a bit to make it easier to work on the back of the engine. There is a tricky bolt below the inlet manifold that holds a support strut to the block. You may only have to loosen, not remove it, when you are pushing the inlet manifold off its studs? Having the engine cover off gives you more working room and also allows you to check that the valves really are closed on the cylinder you are cleaning. A cheap endoscope makes viewing much easier as well as a set of dental picks- see photos. The best scrapers are made from metal pipes flattened and bent at the ends with one end rounded off to suit the diameter of the inlet ports. You also need a tube attachment to your vacuum cleaner to suck up the debris you are scraping out. And depending upon your domestic situation you may have to buy a new bag afterwards if like me, you get odour complaints from other members of the household when you have sneaked the machine back inside. Once the bulk of the material is removed brushes and kero will do the rest. But there can be complications following carbon cleaning. e.g.
https://www.aussiefrogs.com/forum/index ... st-1814341
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matspiderpig85
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Re: 207 1.6 petrol turbo thp misfires

Unread post by matspiderpig85 »

Thanks for the information 🙂 will go get timing checked end of this month when I get paid and if anything is wrong hopefully it's not a full replacement I need and it can be adjusted. I'll try find a video about the cleaning too, do you know if this is the right pump for the turbo coolant pump fault?
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matspiderpig85
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Re: 207 1.6 petrol turbo thp misfires

Unread post by matspiderpig85 »

I'm booking it in for valve cleaning end of this month, see what happens after that
gwest
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Re: 207 1.6 petrol turbo thp misfires

Unread post by gwest »

I’m not sure about the part being the correct one but if it has the right number of pipes there is a good chance that it is. Can be a bit awkward to replace but is your existing one running for 10 minutes after engine shutdown? You need a quiet place to listen or you can touch it with a long handled screwdriver held against your ear.
Does the cleaning place use walnut blasting? Ask for before and after photos.
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xantia_v6
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Re: 207 1.6 petrol turbo thp misfires

Unread post by xantia_v6 »

There are 2 variants with the same pump but slightly different brackets. If you get the wrong one, you can swap the new pump onto your old bracket. When these fail, they normally go short circuit and blow the fuse.
matspiderpig85
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Re: 207 1.6 petrol turbo thp misfires

Unread post by matspiderpig85 »

Do you know which fuse it is? The only noise after shut down or when I get the misfires is the fan, the pump failure code is the only other code that is coming up with the misfire ones. I've had a clean on the inlet valves but I still have the problem, I've noticed an oil leak around the banjo for the oil line to the turbo, got new banjo and washers coming tomorrow, could misfires be anything to do with the turbo? I'm at my wits end with the car 😅
matspiderpig85
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Joined: 29 Dec 2024, 00:13
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Re: 207 1.6 petrol turbo thp misfires

Unread post by matspiderpig85 »

Didn't see your reply until today and totally didn't think to ask for photos 🙃