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Matt, Mechanical Engineer
Category: Car
Satisfied Customers: 22769
Experience:  BEng hons Mech engineering, in auto industry 22 years
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Bought a Feb 2008 Citroen C4 Picasso 1.8L petrol VTR+ in August

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Bought a Feb 2008 Citroen C4 Picasso 1.8L petrol VTR+ in August 2014 with c. 64k miles on the clock which displayed a rough idle on test drive. Dealership agreed to fix and arranged oil / filter service and replaced spark plugs. Slight improvement but rough idle remained when collected car, then broke down within days of purchase in addition to which dashboard error message showing "Engine Management System Faulty". Diagnostics supposedly identified fault on cylinder #1, so dealership replaced injector on cylinder #1 and coil pack. Immediate fault then diagnosed on cylinder #4, so swapped injector #4 with injector #3 and re-tested again, resulting in misfire from cold on multiple cylinders. Fault codes cleared but no further action taken. Car then broke down (major misfire and cut out) + fault lights for ABS, EPS, auto handbrake off and depollution system faulty less than a week later with diagnostics logged in engine ECU as "system anomaly". Faults did not replicate on testing so again, no action taken! 2 weeks later and car misfired and cut out again. Faults did not replicate on testing so again, no action taken! c. 1 month after purchase and vehicle needed complete clutch replacement. Several weeks later and car broke down and displayed all previous dashboard error messages, hand brake would not release and car would not start. When it did (c. 10 minutes later) it defaulted to limp home mode. Returned vehicle to dealership who diagnosed misfires on "multiple cylinders". Visible / accessible wiring and battery checked and appeared OK - therefore engine fuse box (BSM) replaced. New fault now registered (but unable to erase) due to BSM not communicating with BSI on CAN. c. one week later and broke down again + all previous dashboard fault messages - but none stored in ECU (November 2014)? Throughout, the initial rough idle has remained constant.... All told the repairs detailed (as well as rear brake pad replacement as worn metal-to-metal) were all carried out under warranty @ c. £1,200+ and the vehicle then (with the exception of the rough idle which was described as a characteristic of the vehicle) appeared to be OK from November 2014 - April 2015. However, exactly the same symptoms (broke down + numerous dashboard error messages re ABS, EPS, depollution system faulty) returned in April. In conclusion the dealership has contested that replacement of injector #1 during the first few days of purchase satisfactorily resolved the issues identified previously and that the current issues diagnosed as faults in cylinder #3 and multiple unspecified cylinders (not to mention the ABS, EPS, auto handbrake, etc faults) is unrelated and would now be considered normal in-service routine issues! Does this sound reasonable, or could there be other possible reasons why so many faults have occurred such as a faulty ECU, MAP sensor, idle speed controller, etc? Equally, what are the implications of a permanent fault with the BSI not communicating? Apologies its such a long list but this has proved extremely frustrating and I have not used the car now since the beginning of May. Any advice would be much appreciated. PS: The vehicle is booked in for a thorough inspection this coming Monday at an approved Citroen main dealership.
Hello I'd say to collect such a variety of fulats its quite possible that the battery voltage is low as this will generate all sorts of spurious faults so thats probably the next thing to checkI'd also say that the original issues may well be an air / vacuum leak as any air dragged in isn't 'seen' by the ECU and so not compensated for and can lean the engine out and can also allow the engine to rev up when not desired causing rough running.As its a mechanical fault it tends not to turn on the fault light and you can sometimes hear a 'hissing' noise with the engine running. Check the hose clips for tightness and inspect the trunking for any cracks or splits and also all the vacuum system, the small bore pipes and fittings for cracks and missing parts. The best way to locate a leak is to have the engine running and warm and then spray lighter gas /propane around each joint in turn. If the engine rev's up you've found your leak.Now you might think that spraying lighter gas around a hot engine isn’t wise, however the flash /ignition point of gas is about 400°C so you need a naked flame or spark to set it off and I’ve used this method for many years without incident.Work your way through each possible joint one at a time and you should find it. I use a slightly flattened piece of brake pipe and some rubber hose from the can of lighter gas to provide a spraying 'wand' and allow a direct blast of gas into each area, especially those difficult to reach with large implements.
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