Question about Cars & Trucks
When you try to start the engine, it fires (cylinders 1 & 4 only) but often will not run. Smell of unburned petrol. From time to time, it will start and tick over normally for several minutes. Once running the engine is reluctant to accelerate, but if you can get it up over about 2000 rpm, it seems happier. It is sometimes possible to drive it almost normally for 1/2 mile or so, but then it returns to rough running and stalls. Tests tried so far - All normal mechanical tests have been carried out and check ok: valve timing, ignition timing, distributor and rotor, new plugs, coil pack & leads, fuel drained and replaced, fuel pump, no oil in the water, no water in the oil - no indication of head gasket blown, compression consistent, manifold gasket ok. Therefore assumed to be electrical/electronic problem, so ECU sent away for testing and checks ok, spare idle air control and spare manifold pressure tried with no improvement. New coolant temperature sensor. Are there any known conditions with Polos which could cause this?
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Posted on Jan 02, 2017
SOURCE: no compression in one cylinder
Timing belt slipped around cam pulley. Take off your timing belt cover and check the position. This would explain misfiring and compression loss. Stretched belt or missing cogs in belt likely culprit.
Posted on Feb 04, 2009
Before changing you pcm try cleaning your egr valve. remove the valve and see if its stuck in the open position if so use a small pick to clean around the spring.
Posted on Mar 12, 2009
it starts from cold because the auto choke is on ,allowing a richer mixture ,try removing the sender unit in the tank and seeing if the connection from the pump to the outlet connection is ok or leaking causing a loss of fuel pressure
Posted on Aug 02, 2009
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