I have a 1990 Cadillac deville that starts and runs fine when warm and has always been a good starter in cold weather as well. But in the past few weeks it has been hard to start when cold, the outside temp here has been below 20 degrees.
I have to pump the foot feed or hold it to the floor to get the engine going, seems to be getting too much fuel because once it starts it blows a cloud of black smoke, but once running, it stays running and will restart the rest of the day just fine.
There is a much richer fuel mixture during a cold start, the colder the engine the richer the fuel mixture
retarded ignition timing causing the fuel to burn for a longer period of time makes the engine heat up faster
anything that doesn't allow the mixture to be properly metered, like vacuum leaks, bad temperature sensors, or O2 sensors, MAF or MAP sensors, bad EGR valves or PCV valves hoses or tubes,
and or
anything that will cause the fuel mixture not to burn properly, like worn spark plugs, or any other ignition part, wires, cap, rotor, timing, compression, will cause poor start or no start conditions that are worse in lower temperatures,
also low voltage, week battery, slow cranking of the engine can also cause hard to start conditions
How old is your Battery? at the Temp. Stated above an Older Battery even though Good may not have Enough Cold Cranking Amps Left to Kick her Over.
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The battery is 2 years old, I have had to jump start a few times but, the engine is cranking over good. Could a week battery be enough to crank the starter but not enough to give the computer and electronics the proper info for a cold start?
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