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Surging on tickover

King Tiger

King Tiger

PCGB Member
My C2 engine has recently developed a fault which means that it can no longer hold a steady tickover. The revs oscillate; they die, sometimes they are recovered and overcompensated and sometimes not, leading to a stall. This happens hot and cold. Any standard reasons, and typical costs? It is booked in for examination but is it safe to drive in the meantime.. apart from stalling at crossroads! Or is this all gone into on another part of the site?
 
Simplest thing to do is charge the battery fully. I had a similar problem and found that the battery was on it's way out. New battery fitted and the problem went away.

Cheers,
 
It could be the Idle Stabilisation Valve needs cleaning or a vacuum leak. Have you been doing some work in the engine bay? It is also a classic sign the O2 sensor is failing.
 
Mine had that problem and was caused by a faulty distributor. A friend's car kept stalling because of a bad alternator.

So with Fred's and Rob's suggestions you've got at least five potential things to look at and therefore it would be a good idea to have it plugged into to a tester to check for fault codes (mine threw up a hall sensor fault that let us diagnose the distributor as being the problem).
 
Disconnected the ISV and the tickover immediately improved. Any protocols for ISV cleaning? .Also what about the connecting pipes? The engine was certainly overfilled by me due to ignorance, some time ago.
 
Wynns Air Intake & Carburettor Cleaner works well, give it a really good blast through until the cleaner runs clear.
 
. Surging now resolved. ISV valve cleaned. Also potentiometer track/ sliding contact of air mass meter made good.
 
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