colinlaughton Posted March 3, 2014 Posted March 3, 2014 Hello everyone, I would really appreciate help with this one... I have a 55 plate C8 110bhp model (I know I know). I have had a loss of power problem at low revs which NO garage has been able to find so obviously it does not show on their computers as an error... Basically, at around 2000rpm, in 3rd travelling at 30mph (your normal driving speed and gear in traffic) the car will 'kangaroo' and the accelerator will have no effect momentarily. You can only rectify the situation by pressing the pedal to increase the revs and eventually they kick in and the car runs normally again but you are not speeding and need to slow down. The problem is so bad that pulling away you often need around 5000 rpm so that it does not stall. The feeling is very similar to a car with incorrect timing, as you increase the power from the pedal the car actually feels like it is slowing down???? The issue comes and goes, you are never sure when it will come nor can you predict when it will go. It does go, eventually and the car runs relatively well but when the problem is there you have to be on the ball so that you do not stall in traffic. I have also noticed a heavy smell from the car when the problem is happening, sometimes a lot of smoke but not to the point of massive clouds like you see from some older diesels. I am at my ends trying to find a solution!! I thought is could indeed be the timing belt slipping but have been told this is not possible due to teeth on the belt. Then I have considered fuel pump??? Any ideas? Many, many thanks Quote
paul.h Posted March 3, 2014 Posted March 3, 2014 Welcome to the forum. Have you tried replacing the fuel filter although it is probably not this ? Quote
Stevep Posted June 17, 2014 Posted June 17, 2014 Did you manage to solve this fault? Got exactly the same thing happening to mine!the Garage have plugged into the ECU and no faults registered,slowly driving me mad. Only had a month,before I had the car a new DPF had been fitted and additive. Any help please Quote
paul.h Posted June 17, 2014 Posted June 17, 2014 Welcome to the forum, was the garage a Citroen dealer or specialist using a Lexia type of diagnostic machine ? Quote
Stevep Posted June 17, 2014 Posted June 17, 2014 Not a Citroen garage so assuming a lexiia type? Said he went into both sections when he was checking if that helps will they have different diagnostics? Quote
paul.h Posted June 18, 2014 Posted June 18, 2014 The Lexia is the Citroen equipment but Chinese copies are available from such as ebay to put on to a lap top. This equipment allows you to check all the sensors and see what is not working as it should. Maybe you could ask the garage for more info on what equipment they used and what was checked - possibly only a check for fault codes was made. Quote
coastline taxis Posted June 18, 2014 Posted June 18, 2014 Unplug your mass airflow multiplug and see if you get the same symptoms Quote
Stevep Posted June 18, 2014 Posted June 18, 2014 Unplugged the mass air flow and it did go away and drove nicely,following day was in a sort of limp mode so plugged back in and ok for a while.Not sure whatelse unplugging the Air flow disconnects??? Quote
paul.h Posted June 18, 2014 Posted June 18, 2014 coastline will be back later but the test may suggest your air flow meter needs cleaning or replacing. With it plugged in, if it is giving wrong info then the fueling will not be correct. With it unplugged the car will go in to a limp mode that lets the car run well enough. Quote
Stevep Posted June 18, 2014 Posted June 18, 2014 Was hoping it might be something simple like the airflow is there anythingelse to check? Do you know if the cambelts are suspect on the C8?Mine is a 2006 got 78k on clock. Thanks for the help so far. Quote
paul.h Posted June 18, 2014 Posted June 18, 2014 Cam belts are a common failure on the C8 due to water dripping on to it. If it is still on the original one then I would change it asap. If it snaps and it is a diesel, the injectors need to be removed to allow the cylinder head to be removed for the repairs - but often the injectors can not be removed and a replacement engine is a lower cost option (with a new cam belt). As an example http://www.citroen-owners-club.co.uk/citroen/topic/21432-a-few-technical-issues-cam-belt-snapped/ Quote
Stevep Posted June 18, 2014 Posted June 18, 2014 Will do is it worth changing the water pump at the same time? Quote
coastline taxis Posted June 18, 2014 Posted June 18, 2014 Definatley change water pump. And id be changing the airflow meter aswell Quote
Stevep Posted July 2, 2014 Posted July 2, 2014 Hi everyone,Just an update,had the cambelt and water pump changed along with the Airflow meter and oil/filter ect. Same symptoms have re-appeared tonight on way home must have happened 20 times in less than a mile luckiliy I was travelling at 2-3k revs so just annoying and a puff of smoke each time (Apparently last time my friend was following and said it didnt smell to good).When I did stop no revs until 2k without warning so stalled first time.Last three miles no problem any ideas???? No faults / Warning lights on. Steve Quote
paul.h Posted July 2, 2014 Posted July 2, 2014 You have not said which engine your car has but it must be a diesel due to having a dpf. Was the new air flow meter from Citroen ? Can you also confirm that your symptoms are identical to the first post - kangarooing, loss of power, need 5k rpm to set off so it does not stall. Also, does the temperature gauge show normally, probably slowly goes to mid way after running for a few miles - just in case the temperature sensor is faulty and resulting in wrong fuelling. A problem with the egr valve can give clouds of smoke so it is worth checking the actuator hoses to it in case one has a split and also the valve may need cleaning or possibly replacing.Has the fuel filter been changed recently since these can block up and affect performance ?With the car stationary, if you slowly push the accelerator pedal down do the revs increase gradually, just to check the pedal is ok - I had to replace one on a C3 which had worn the electrical bits and it did not rev smoothly between about 1 and 2k rpm.Another thought is a possible turbo problem limiting the boost, but to check this would probably need a diagnostic check looking at the boost pressure and if it is a variable vane one to see if the vanes are free. Quote
Stevep Posted July 3, 2014 Posted July 3, 2014 Hi Paul,Yes its a diesel and the AIr flow is a Lucas one from the local motorfactors. If i start from scratch just in case I am causing confusion (probably am so do apologise). Fault appears very randomly last time was ok for 300miles time before 50miles so no pattern really.If you are travelling along 50-60mph at say 2.5k revs you get what feels like someone applying the brake a puff of smoke and then back to normal all within 2 seconds and then of you go again sometimes thats it for a while sometimes like last night it happened for about 3 miles and must of been 20times then cleared and today its fine.If by any chance you are in traffic or need to stop and it happens it gets a bit trickier!With the car stationary as you slowly press the accelerator pedal nothing happens and then suddenly at 2000revs it cuts in and as long as you keep above that you can get going tricky in traffic! it also is smoking and sounds wrong as if underload or fueling wrong then it with no reason clears. Any clearer? Of course this never happens when the garage have it!!! Steve Quote
paul.h Posted July 3, 2014 Posted July 3, 2014 I am not an expert but if the fuel filter has not been changed recently it may be worth doing and if you buy the fuel from the same place each time, then try somewhere else in case it is dodgy fuel. As a minimum you could drain any water from the fuel filter. I asked about the new air flow meter since I have read that sometimes ones from such as ebay do not always work properly. When coastline taxis is next on the site it will be interesting to see what he thinks since he has a lot of knowledge and experience on diesels. Quote
Stevep Posted July 3, 2014 Posted July 3, 2014 Changed the fuel,oil and air filters. Fingers crossed someone has come across the same faults!!!!! Quote
Gilbern Invader Posted July 17, 2014 Posted July 17, 2014 If symptoms persist think the DPF system is regenerating randomly. You need someone with Lexia to check the regeneration log to confirm and what is causing it to do it so often. Could be the exhaust temp sensor is not connected or its wire is broken. Sensor is vulnerable mounted between cat and dpf. Quote
Stevep Posted July 23, 2014 Posted July 23, 2014 Thats a couple more things to check,will update asap. Thanks! Quote
paul.h Posted July 23, 2014 Posted July 23, 2014 A problem with frequent dpf regenerations has recently been reported by another member, was occuring every tens of miles and Lexia was showing the dpf was blocking. Latest findings were that the eolys fluid may have run out but we are waiting for the feedback. http://www.citroen-owners-club.co.uk/citroen/topic/21612-fap-builds-up-soot-very-fast/ Quote
Stevep Posted August 26, 2014 Posted August 26, 2014 Hi guys,Sorry for the delay in coming back decided a holiday was needed!!!!Checked the DPF Regen was saying it had regened 200km ago and the car had played up that day!Changed the exhaust temp sensor!Cleaned the pipes and EGR quite sooted up. Still the fault exists............driving me and the garage mad.Still no fault codes showing!!! Any thoughts most welcome. Steve Quote
paul.h Posted August 26, 2014 Posted August 26, 2014 Has the eolys fluid run out ? Does the fuel filler cap still have the magnets in it (remove it and try a key on them, should be 2 on opposite sides) ? Quote
Stevep Posted August 28, 2014 Posted August 28, 2014 Eolys been replaced when the dpf was changed and filler cap still has magnets on. Steve Quote
coastline taxis Posted August 28, 2014 Posted August 28, 2014 get a leak off test done on your injectors. sounds like one could be sticking or overfueling Quote
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