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Sluggish engine after lock down


rooster63

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Have barely used our van (Citroen Relay 2007) since lock down so went for a day out yesterday. For first couple of miles van lacked power and seemed to be giving out more black smoke than usual when accelerating. Did seem to improve after a couple of miles and on way home drove 12 miles or so in a lower gear to get the revs up to make sure the engine was nice and hot. Still getting black smoke on hard acceleration (can't remember if that used to happen as I generally am light on the throttle). Filled up with diesel before the lock down so fuel may have deteriorated. Intend to check air filter, if it is easy to get at. Is it worth adding one of those additives which claim to clean injectors, EGR valves etc?
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A common problem to give black smoke on acceleration is either a faulty egr valve or a split/hole/loose hose clamp in the turbocharger pipework or intercooler. The most likely is the egr valve. Cleaning or the magic additives won't work, it will need to be replaced. Since the the 2.2 engine is the same as used in the Ford Transit aftermarket egr valves are not very expensive.

https://www.ebay.co.uk/itm/BRAND-NEW-EGR-VALVE-FITS-FOR-CITROEN-RELAY-2-2-HDi-100-120-2006-ONWARD/133203828520?hash=item1f03911f28:g:JloAAOSwWvtdpbre&redirect=mobile

https://coastalmotorhomes.co.uk/fiat-ducato-peugeot-boxer-citroen-relay-ford-transit-oe-2-2l-diesel-egr-valve.html

 

Mike

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It could also be rodents nesting in your air intake, assuming it is similar to that on Fiat derivatives, as they suffer also.

 

You will need to remove all the ducting up to and including the air filter element to check properly.

 

Black smoke is typically a sign of over fuelling or lack of air so very possible.

 

Keith.

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  • 2 weeks later...
Well it was the EGR valve, garage computer threw up multiple codes but mechanic pin pointed the EGR valve stuck in the open position. New valve fitted (£315) so not cheap but van seems fine now. Hopefully will be able to put van to good use over the next few months, sadly no trip to France but hope we will be welcomed in Cornwall (we're from Dorset so hopefully the locals won't treat us as Covid19 super spreaders)
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