Limp Home Mode

[mtdking]

Like probably most 2.2 Hdi C5 owners I am and have been for a while now suffering from the dreaded limp home mode particle filter has been changed and fluid topped up, pipes cleaned out but the problem keeps returning, I have got a 2002 2.2 Hdi C5, the error code shows turbo pressure too high???? has any one had this problem and have they found a cure, having now spent more on the car than it is worth I dont know what to do I love the car but Im at the point where I dont want to spend any more on it, thanks for any help you can give me. :rolleyes:

[Ronin]

Remove, clean the egr valve and solenoid if it is still no better replace it and the vacuum pipe.

 

Remove all the interconnecting pipes from the turbo to air box one at a time and check for obstructions, then refit and secure. Try an engine flush to remove any deposits that causing any back pressure and run the car for 1000 mile on a fresh oil and filter change of the thinnest quality oil recommended for the car (mobil 1 15w30 is damn good but expensive).

Take the car out for a long run of 40miles at least at a constant speed of 40 mph, no higher, no lower and no interuptions like junctions etc. 2 am on a dual carriageway is just the job. Get a check done on the MAF sensor, it could be giving a false reading.

 

Has any previous owner tweaked the turbo actuator by removing the securing bolt on the bar and twisting it one full turn perhaps?

Definately not recommended on a C5 hdi but older 1.9td 306's & Xantias could increase the boost with this trick. someone may have tried it!

[davidad]

Removing the EGR valve on the 2.2 looks easier said than done as it's hiding between the engine and bulkhead. Anyone got any tips on how to do it?

[Ronin]

Realistically the best way is to get it on a set of ramps with the bonnet open for extra light and the suspension set on high.

You can get to it via the down pipe tunnel. Expect to use some long flexible U/J extension bars and sockets. Not a difficult job but awkward to get into without proper tools. Dont forget to replace the paper gasket once removing it. You can use hylomar if you can't get it from the dealer.

[davidad]

Thanks for that. It's a pity it's such an awkward thing to get at. I cleaned the EGR valve on my daughter's Renault Megane recently and that's really accessible, probably just as well given the problems that Renault dci engines have with egr valves!