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Hi All,

My brother has a 406 -97 2.0 petrol auto which is a lot more lazy than expected and drinks more fuel than I think is normal. Any good ideas on where to start? Oil + filter and air filter is pretty new. Spark plugs are not old either.
 

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If you have recently changed your timing belt, check your timing marks. Even one teeth off the mark has a significant effect in your engine's performance.

Hook it to Peugeot Planet and check the parameter measurements.

Read live data for these sensors:

Map sensor
O2 sensor (upstream)
TPS (throttle position sensor)
ATS (air temperature sensor)
CTS (coolant temperature sensor)


Also check your ignition dwell times for all cylinders + injectors' pulse widths

To make sure your engine is mechanically sound, do a compression test on all 4 cylinders (dry & wet).
 

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I'd do a compression test to start with just to establish how good the engine internals are.
Don't forget to squirt a little oil in and do a second test. A significant rise in pressures indicates the rings are worn.

Cheers
Roland
 
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