There are 2 things that affects cold start running.
1. Fuel system. When cold the engine requires a richer running condition and most older vehicles either have a manuaul choke system whereby the choke is pulled to close the upper carburettor bore to increase the fuel ratio to the amount of air going in to enrich the system. This would also increase the idling speed of the engine to reduce shorter wating period.
If your carburettor is equipped with the choke system, get it checked and ensure it is working correctly.
2. Ignition system. When ignition coil, spark plugs and wires are bad, they would run bady when cold. After warming up, they would perform better.
Get the spark plug cables ohmed out and ensure they have continuity and have less than 25 k ohms.
Ensure the sparks from the ignitin coil are strong, ( bright blue) weak sparks would not allow the cylinders to combust correctly.
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Sunday, January 2nd, 2011 AT 3:14 AM