Any basic checks carried out.?Cylinder compressions,valve timing cam belt?Some of these engines have adjustable tappets.

You need a garage with Lexia diagnostic equipment. That reads live data of all key components, and not just a fault code, which poor to average mechanics will just Google and try swapping coil pack or injectors at your expense.

For exmaple, live data will show air flow at the MAP sensor and how other components are performing and what data they're relaying back, checked against a reference value

Edited by Gibbo_Wirral on 31/03/2015 at 14:27

While I agree with Elec/doc for the most part Citroen Lexia is what I'd plug in,

computer diagnostics cant as yet do everything.

Giving your other garage the benefit of doubt That they have tried......

I'd be plugging in my compression leakage tester,

This injects shop compressed air into the cylinder to see if it can maintain pressure.

So if I inject 100 psi and it only holds say 75 psi the escaping air can be heard from say the inlet meaning faulty inlet valves.

Exhaust valve leaking means air from the exhaust and air from the oil filler cap means the ring/bore is at fault.

So it's really a more sophisticated from of compression tester,

So advice is find a garage that has "Lexia" diagnostics and a compression leakage tester.

The leakage tester really isn't that expensive tool compared to some of my other diagostics equipment

But it is a really useful tool.

Edited by hardway on 31/03/2015 at 22:36