1. The battery may be weak or
2. The self starter may need service or
3. Your car needs block heater
Veral but my first thought was a leaky injector or fuel pressure regulator.
here is some detailed info, here goes.......
During engine operation, the fuel system is maintaining the required fuel pressure to meet the demand of the engine. When the engine is shut off , the fuel system should be at or near the same pressure level. The rate at which the fuel pressure drops can be an indication of an internal system leak (assuming no external leaking occurs) you don't have this as it would take only hrs to have a start problem.
Two most common areas of concern are the fuel injector nozzles and the pressure regulator. If the regulator valve has a poor seal, fuel will leak past the valve seat area and, since the pump is no longer running, pressure will quickly drop off or sometimes slowly. The causes for this could be a worn valve, weak spring or defective diaphragm. An internally leaking regulator can cause long crank times as it takes the pump longer to build pressure in the system.
The other potential problem area could be the fuel injector nozzles. The nozzle may be leaking due to a deposit build up on the nozzle or a worn out internal valve seat. In this case, fuel leaks directly into the engine's cylinder. Depending on the number of injectors on the engine, this could be a real problem if more than one injector is leaking fuel into the cylinders. This is a common cause of long crank times and hard starts after a short engine shut down.
One leaking and takes days to leak down.
Personally I'd start with replacing the fuel pressure regulator. Finding a leaky injector..try this. turn the key to the on position wait 5 minutes look at the injectors see if there is one that looks wet or has deposits around it.
You can also do a sniff test (not while running!) sometimes you can get a smell of gas from the leaking injector. (if the wind isn't blowing) Actually try this first before replacing fuel pressure regulator. If it starts up quicker after the 5 minute key on one of the above is the answer.
hope i didn't confuse you.
Best of luck.
Stay warm tis -5f here.
SOURCE: 2004 audi s4 b6
you would need to tell me more, to vague;;for a problem of this magnatude i or us would need more information ;;ie how did you come to the conculsion that its misfireing on number 1 cyclinder???.before we take this any further.i want you to do one thing;;; run a can of fuel cleaner through the fuel system lets say 100 kms.if this does not elemanate it. then come back to us .we need more details about number 1 cyclinder.????.and who said your power unit was missing on number 1;; add why????.adrian
SOURCE: I'm wondering whether on my
Firing order for 2003 (B6) Audi S4 4,2l V8 engine is: 1 - 5 - 4 - 8 - 6 - 3 - 7 - 2
Cylinder no.# 1 is first one from right front side of the car, and cylinder no.# 4 is the fourth one (front to rear) on the right bank of cylinder block. See picture below:
Hot starting problems are usually fuel related. When a hot engine is shut off, the temperature of the engine and everything on it continues to rise for awhile as the engine undergoes a period of "heat soak." This can cause fuel to boil inside the carburetor bowl, fuel lines and fuel filter. When you attempt to restart the engine, "vapor lock" obstructs the flow of fuel and the engine doesn't want to start.
This is much less of a problem on fuel injected engines because the fuel is usually under much higher pressure inside the injectors and fuel line. Even so, a fuel line routed near an exhaust manifold or a fuel rail that's exposed to a lot of heat may still suffer the same kind of problems.
Heat soak problems such as these can sometimes be cured by wrapping insulation around affected fuel lines, and/or installing an insulating spacer or heat shield under the carburetor.
A Seasonal Problem
Hard hard starting tends to be a seasonal problem, but may be worse in the early months of spring when refiners are switching fuel blends. Gasoline refiners produce fuel with a slightly lower volatility rating (called "Reed vapor pressure") during hot summer months because lower volatility fuel is less likely to boil and cause hot starting problems. During the winter, they switch to a higher volatility fuel because it makes cold starting easier. But if you still have "winter" grade fuel in your tank when warm spring weather arrives, you may experience some hot starting problems. The problem will go away, however, as soon as the refiners in your area switch to their summer grade fuel.
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