Lumpy running/vibration from engine on idle and when driven. No faults
found or fault codes stored.
Suspect fault due to sticking variable
valve timing.
The fault was cured by adding Forté Advanced Formula Motor Flush
and flushing the engine for 3 hours and adding Forté Top End Treatment to the
new oil.
Thanks to Martin at Central Garage in Brixham, Devon.
Forté's Technical Helpline receives over 300 calls per month. This blog shares solutions for garage workshops on common driveability concerns that can be quickly and effectively treated. The vast majority of those identified are caused by fuel and oil borne contamination formed by natural degradation or via the combustion process. This is a fact of life for internal combustion engines where fossil fuels and oils are used.
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