Liam121093 Posted July 22, 2017 Share Posted July 22, 2017 Hello I have a Ford Focus MK2 1.6 TDCI suffering from Turbo Underboost. (no Engine Management Light) It will run fine with plenty of boost when first started but if i go uphill and plant my foot to the floor after around 10 seconds i have almost no boost pressure left (6-8 PSI). Also if i am on the flat i can put my foot flat to the floor but if i hold it for more than 10-20 seconds i loose most boost again. If i turn the car off and on again my boost pressure will be back until the same happens. I have checked 1. All pipes for air leaks. 2. changed MAF sensor and Intake Temp sensor 3. boost control valve 4. actuator is holding pressure Do you have any advice on what to check next or should i be looking at a new turbo? Thanks in advance Quote Link to comment Share on other sites More sharing options...
lasthope Posted August 31, 2017 Share Posted August 31, 2017 did you get this sorted liam,sound like what iam having prob with Quote Link to comment Share on other sites More sharing options...
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