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Gallagher99, Senior Vehicle Technician
Category: Car
Satisfied Customers: 3332
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Just purchased a 1.2 polo ( 56 plate), Engine is running rough,

Customer Question

Just purchased a 1.2 polo ( 56 plate),
Engine is running rough, but done compression test, and all 3 cylinders show good pressure.
Have heard, 3 cylinder engines suffer from stuck valves caused by valve stem seals or not seated correctly from new.
Engine has done 70,000 miles, and looks very good ccondition
Submitted: 3 years ago.
Category: Car
Expert:  Gallagher99 replied 3 years ago.
Hi there , Good evening to you

ok the most common cause of rough running on this 1.2 -3 cylinder variant is the timing chain jumping a tooth or 2
after the obvious ignition system checks are ok and compression is good I would check the valve/engine timing

you require 3 special tools to do this
2 pegs for the camshafts and a peg for the crankshaft
this isn't a big job to carry out the check with these tools

remove the 2 caps off each camashaft end (gearbox side )
and remove the crankshaft sensor and turn the engine till you can insert the crabkshaft peg ( use a mirror to assist locating the hole in the flywheel)
once this is in attempt to fit the pegs to the camshafts
you normally find that only one fits and the other is slightly out

you can buy a modified timing chain kit from most auto suppliers and obviously volkswagon

I would certainly be checking and ruling this out as it is a very common occurance on this model/engine variant

If you need anymore help or advice on this issue please let me know
If you are completley satisfied with my answer /advice
Kind regards in advance and have a nice evening


Expert:  Gallagher99 replied 3 years ago.
Hi there ,good evening to you

How did you get on in regards to the running concern issue

Regards in advance