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Underpowered Y-Reg Peugeot 306 - What can I do?

My brother's Y-Reg Peugeot 306 HDI is under power, the turbo doesnt cut in and their is no smoke coming out the back. It will drive along up to 80mph OK, just wont get their very quickly!

Any info on which direction to go would be very grateful?

Asked on 1 August 2012 by pistolpete81

Answered by Alan Ross
Well, the easiest way to identify the fault would be by a diagnostic check, this should show a fault code, ie P ---- 4 numbers which can then be used to narrow down the problem.

If not a diagnostic, then you would need to check the following:

1. Air Filter restriction

2. Intake system air leaks

3. Condition of fuel filters /pipes

4. APP (accelerator pedal position) sensor

5. Injectors

6. MAF (mass air flow) sensor (if fitted)

7. Turbocharger (TC)boost pressure sensor (if fitted)

8. TC bypass valve (if fitted)

9. TC Waste-gate regulating valve (if fitted)

10. TC Wastegate

11. EGR (exhaust gas recirculation) throttle control valve (if fitted)

12. EGR valve position sensor (if fitted)

13. Fuel pressure sensor

14. ECT (engine coolant temp) sensor

15. Camshaft position sensor

16. CKP (crankshaft position sensor)

17. Exhaust/cat restriction

As you can see, there are many things it could be, hence the diagnostic check.
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