Ciano35 Posted September 5, 2013 Share Posted September 5, 2013 Hi everyone,First post here So I'm having a problem with my 2003 focus tdci (115ps).Basically it loses power at high rpm. In first gear it revs to redline no problem with plenty of power. In second gear it loses its power at about 4000 rpm, third gear at ~3200 rpm, and so on. It has perfect power to these rpm's, and then it can only slowly creep up to redline.I can't find anything online that I haven't tried already.Here are the things that I have done:-Checked turbo shaft, no play-Full service last week; air, oil, fuel filters done, oil change-EGR blanked, made no difference except for quicker throttle response-Cleaned MAF sensor-Checked hoses, new silicone hoses put in last week-Cleaned out air intake hoses and intercooler-No warning lights ever come onI hope someone here can help me :-)Thanks!Cian Quote Link to comment Share on other sites More sharing options...
mjt Posted September 5, 2013 Share Posted September 5, 2013 Have you tried running it with the MAF unplugged? Quote Link to comment Share on other sites More sharing options...
Ciano35 Posted September 5, 2013 Author Share Posted September 5, 2013 No I haven't actually, if that brings on a fault light will it stay on after I plug it back in? Quote Link to comment Share on other sites More sharing options...
mjt Posted September 6, 2013 Share Posted September 6, 2013 I don't think it should activate the fault light but if it did it should go off by itself after a few drives. Quote Link to comment Share on other sites More sharing options...
jeebowhite Posted September 6, 2013 Share Posted September 6, 2013 It will activate the warning lamp if you thrash the car and try to do 0-60 in 3 seconds, but if you drive around casually and on an MPG drive, you should find that its fine. I disconnected it on the CMAX, did a 35 mile journey without issue, but as soon as I floored it, the light came on. Quote Link to comment Share on other sites More sharing options...
Ciano35 Posted September 7, 2013 Author Share Posted September 7, 2013 Thanks for the advise guys, but ran the car with the maf plugged out today and didn't make any difference. Maybe it could be the turbo solenoid? Quote Link to comment Share on other sites More sharing options...
martyntdci Posted September 7, 2013 Share Posted September 7, 2013 I always thought if u unplugged the maf the car would b lumpy and may even die under load.... Quote Link to comment Share on other sites More sharing options...
jeebowhite Posted September 23, 2013 Share Posted September 23, 2013 Nah the car can cope without knowing how much air is in there at standard running. The ECU is programmed to say that standard revs will have a certain amount of air in the system, and so works to that number, the MAF adjusts that on the fly and so keeps it smooth, but if you start getting less air than it expects (choked up air filter for example) this can cause the lumpy death of the smooth run! It could be the solanoid, but you may have a split pipe somewhere. Quote Link to comment Share on other sites More sharing options...
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