MondeoLAD Posted January 29, 2013 Share Posted January 29, 2013 hi just brought a mk3 tdci euro 4 engine 55 plate mondeo the problem is really wierd if u drive it hard after 3000rpm it will go into limp mode ... but if driven sensibly it will go all the way round the rev range ???? when i brought it the guy said it has had a second hand turbo actuator on it . as the old 1 failed .. . and he was told sometimes they need recoding ??? is this true ?? or not ??? also today i unplugged the MAF Sensor ( airflow meter ) and the car didnt run no different ..... but im sure it should of ran lumpy and smokey with out that connected ?????but the engine management light did come on ??? but went off when reconnected MAF Sensor . it starts first time in a morning . no smoke from cold when started . and no smoke when driving .... engine is a little knocky but put that down to a diesel knock the things i have tried is Clean EGR Valve Unplug MAF Sensor ( Changed MAF Sensor as it brought code p0100 up ) Changed Boost Pipe As it was split Changed Airfilter As it was black .... checked for a power feed to MAF - All Workin Fine What else could it be ???? its got 148k on clock .... Im still getting 40mpg combined ....which i think is good ???? and around 35mpg round town ..... Quote Link to comment Share on other sites More sharing options...
BigD Posted January 29, 2013 Share Posted January 29, 2013 I have exactly the same car (assuming yours is a 130 6-speed). I wonder if the turbo vanes are sticking when you just bang the revs up to the top? Thing is a 2nd hand one might not be much better than the one it replaced. 'fraid I can't really help much, beyond saying that I get almost 50mpg just moochin about, and almost 60mpg on a motorway run. Do you have a code reader? Force it into limp mode and check for stored DTCs. Also, did you clean the MAF or just look at it then put it back? Clean the metal wires (very carefully) with a cotton bud dipped in carb cleaner, also clean inside the little tube bit as well. If it's caked up in filth it won't be working properly. When you cleaned the EGR valve did you have a go at the inlet manifold too? Because that can get just as bad. Quote Link to comment Share on other sites More sharing options...
Maddogpro Posted January 30, 2013 Share Posted January 30, 2013 Is the tube coming up too the egr split you wont see unless you take it of and inspect it also when was it serviced last my guess is a while ago change the fuel filter for a gen ford one .......... Quote Link to comment Share on other sites More sharing options...
MondeoLAD Posted January 30, 2013 Author Share Posted January 30, 2013 the maf has been changed .. and the egr pipe has been changed Quote Link to comment Share on other sites More sharing options...
Maddogpro Posted January 31, 2013 Share Posted January 31, 2013 Fuel filter any service history at all ? You described the air filter as pitted with this being an easy item i doubt any of the nuts bolts and spanners servicing has been done Quote Link to comment Share on other sites More sharing options...
MondeoLAD Posted January 31, 2013 Author Share Posted January 31, 2013 its the EGR Valve got code p0405 .... Quote Link to comment Share on other sites More sharing options...
BigD Posted January 31, 2013 Share Posted January 31, 2013 If you change the EGR, get it from Jaguar. Identical part and half the cost of the same thing from Ford. Quote Link to comment Share on other sites More sharing options...
MondeoLAD Posted February 1, 2013 Author Share Posted February 1, 2013 im gunna blank it ... cheers Quote Link to comment Share on other sites More sharing options...
FOCA Posted February 1, 2013 Share Posted February 1, 2013 Good idea to blank the EGR, some Mondeo owners are on their 4th valve, a Mondeo TDDI runs better with a blanked valve than a "perfect"ly working one - solid,(no holes to let gasses through) stainless steel ones ate best As you have a Euro 4 the EML is liable to come on with the blanked EGR (but limp home mode should not be triggered) Worth cleaning out your inlet manifold as well There must be a reason the car goes into "limp home" mode when you drive hard and not when driven "sensibly" One possibility is the variable vanes in the turbine are coked up / not moving to their fullest extent, the vanes control the boost pressure via the control rod and actuator, if these items are not attenuating boost enough it may cause exessive boost triggering limp home mode when driven hard and when driven "sensibly" not enough energy in the system is created to generate enough boost to trigger "limp home" mode the vanes sticking can cause actuator failure, as the SWR on the motor goes up, that may be why the actuator was changed Other things can cause this eg, fuel delivery / injector problems (sufficient flow/ preesure for moderate driving, not enough for hard driving etc) Not everyone achieves 60mpg, it can depend on road conditions, driving style, outside temprature, duration/ length of each run, tyre size/ type/ make/ pressure, weight in the car etc etc, 35mpg round town and 40mpg isnt too bad and results an ST220 driver could only dream about The engine is quite low revving, peak power may only be at 3 to 3.5k (euro4 Mondeos tend to develop peak power at lower revs than euro3s, in my experience ) and peak torque much lower (typically 2.2k, depends on exact model) so changing up at 3k may make the car accelerate faster anyway - if you are "mooching about(cruising?)" you probably want to change up earlier, 2 to 2-1/2k car will probably pull better/ return a better MPG No point in "booting" it round town/ in 1st/ 2nd, these cars are rubbish 0-60 / through gears anyway, once your in the higher gears/ in the midrange its a different story, if you use the available torque, again you will make better progress, and get a better MPG Quote Link to comment Share on other sites More sharing options...
MondeoLAD Posted February 1, 2013 Author Share Posted February 1, 2013 ive had it on a reader .and the egr is the only thing comming up . got 1 comming tomorrow to try ..... still gunna blank it anyway .. cheers Quote Link to comment Share on other sites More sharing options...
Maddogpro Posted February 3, 2013 Share Posted February 3, 2013 I blanked mine and made hell of a difference also cleaned out the egr and the inlet manifold it was full of black carbon crud Quote Link to comment Share on other sites More sharing options...
MondeoLAD Posted February 3, 2013 Author Share Posted February 3, 2013 well i changed my EGR and still going into limp mode ... am gunna blank it off and see what happens ... gunna change a boost hose i taped up cuz of a little hole ... chgeers Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.