neonovice Posted October 23, 2014 Share Posted October 23, 2014 Hi, I've got an issue with a 2007 110 puma defender. It looses power, going into limp mode due to fault code P0234-00 'turbo overboost condition'. So far I have: Replaced all pipes (turbo to intercooler + intercooler to intake manifold) Changed all filters Removed and inspected intercooler (clean as a whistle) Replaced plug LR020663 as per Land Rover recall TECHNICAL SERVICE BULLETIN No.LTB00254/2010 Removed and cleaned EGR Replaced turbo and actuator (£££££££££) Still having the same issue. If I turn the ignition off then back on the power returns, only to disappear 5 miles further down the road; do that 3 times and the engine light comes on. Really at a loss as to what to do next. Any suggestions welcome! Quote Link to comment Share on other sites More sharing options...
Daan Posted October 23, 2014 Share Posted October 23, 2014 No experience with this engine, but It could be a leak in the intake somewhere. I have successfully traced this kind of thing by blocking the pipe to the air filter, pressurise the intake system with your lungs and listen if you hear any air escape from somewhere. For this to work you need complete silence. Any crack or split in a pipe is almost impossible to find just by looking at it. Daan Quote Link to comment Share on other sites More sharing options...
neonovice Posted October 23, 2014 Author Share Posted October 23, 2014 I'll certainly give that a try. I have replaced all the pipes in the system and refitted them a number of times. Free though; so worth a shot. Quote Link to comment Share on other sites More sharing options...
V8 Freak Posted October 23, 2014 Share Posted October 23, 2014 Surely if it's over-boost it is too much pressure? (not a leak) Would that not point to the MAP sensor? If it thinks there is more pressure than their actually is it could record an over-boost and lead to your situation.... I don't know the Puma engine at all, but assume it will need to know what the air pressure is just like any other electronically controlled turbo & injection system. Just a thought... Neil Quote Link to comment Share on other sites More sharing options...
Jon W Posted October 23, 2014 Share Posted October 23, 2014 I also don't know this engine but I know of a similar problem on the vw t4 engines, and can be due to splits on the small pipes which control the boost (actuator pipes), on the t4 there is one which goes to the ecu and a boost control valve. Normally 3 or 5mm silicon pipe can be used to replace them. May be worth a look at Jon Quote Link to comment Share on other sites More sharing options...
Daan Posted October 23, 2014 Share Posted October 23, 2014 As above; the same method applies. Quote Link to comment Share on other sites More sharing options...
Ally V8 Posted October 23, 2014 Share Posted October 23, 2014 Has the PCM got the latest software flash ? Often now the factory will dumb down certain parameters to stop limp home situations or fault logging/MIL lamp on situations. Quote Link to comment Share on other sites More sharing options...
dave1607 Posted October 27, 2014 Share Posted October 27, 2014 Not familiar with this engine either, so this may be of no help what so ever, but I once had a similar issue with the wifes Renault Clio, this had a vacuum controled actuator and the little solenoid valve that controls the vacuum to the actuator was knackered and was causing it to go in to limp mode and giving a "manifold pressure out of range" (or something like that) fault. Replaced this and it was fine, I found a workshop manual online and it gave the resistance between the two terminals on the valve, which confirmed the fault before I spent any money. Dave Quote Link to comment Share on other sites More sharing options...
Bowie69 Posted October 27, 2014 Share Posted October 27, 2014 Soapy water for boost leak hunting, look for the bubbles Quote Link to comment Share on other sites More sharing options...
neonovice Posted October 28, 2014 Author Share Posted October 28, 2014 It was the sensor. Quote Link to comment Share on other sites More sharing options...
Bowie69 Posted October 28, 2014 Share Posted October 28, 2014 I'm sure there is more than one Quote Link to comment Share on other sites More sharing options...
neonovice Posted October 28, 2014 Author Share Posted October 28, 2014 The one on the inlet manifold, where the EGR meets the air intake. Quote Link to comment Share on other sites More sharing options...
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