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2005 Forester XT 2.5
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7 Posts
Discussion Starter · #1 ·
I have a 55 plate 2.5 XT on LPG
Replaced the Secondary air pump and shortly after was experiencing rough idle on petrol
but not when the engine auto switched over to LPG

Diagnostics error
Cylinder 4 Misfire

Work undertaken so far

Swapped coil pack 4 to 2 error remains on 4
Swapped Plug 4 to 2 error remains on 4
New Spark Plugs
New MAF sensor

Rough idle now on Fuel and LPG
Compression test shows Cylinder 4 down 9 Psi compared to other 3 cylinders
Cylinders 1-3 showing all same readings

Was thinking maybe replace the Cylinder 4 injector
Or smoke test for hose leak

Engine now sat with just plugs installed and all ancillary’s removed

Any help greatly appreciated....... or info on a decent mobile Subaru Engineer around Manchester
 

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7 Posts
Switched the plug no fix, the coil no fix and then the injector and it fixed a P0304, hope this helps. 05 FXT with 140k on the clock
 
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