Start engine problem

[Alexzeat]

Hello to all

I have a problem with my engine, when i try to start in the early morning( cold) it start very very fast, then i use the bus and stop the engine, try to turn on again and it start very very fast. BUT if i stop the engine and wait 15 minutes and then try to start again, it take time and seems like one cilinder no work.... later if i make more gas , it dissapear... but i dont know what is the problem.


Please check the video atached;



Link

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Volkswagen T1 Kombi 1500 1963
Volkswagen T2 Pickup 1600 1974

[mikedjames]

This is normal.
First start, engine is cold, choke is on, throttle is held open by choke mechanism. Engine idles fast.
Second start, engine is warmer, choke on less, throttle is held open less - engine still idles fast, it has warmed so spins easier with less throttle.

Later start - engine is hot, choke cools down and closes, mixture is now too rich for hot engine, engine harder to start. When it starts it idles at correct speed, 850 RPM +/-

You need two different starting approaches :

Cold engine start - one press of gas pedal, release, crank, starts quickly.

Hot engine start - press and hold gas pedal, crank and wait for air to pump into the engine to lean out the mixture, engine starts.

This happens because the engine holds heat for longer than the choke mechanism when you stop the engine.
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Ancient vehicles and vessels

1974 VW T2 : Devon Eurovette camper with 1641 DP T1 engine, Progressive carb, full flow oil cooler, EDIS crank timed ignition.
Engine 1: 40k miles (rocker shaft clip fell off), Engine 2: 30k miles (rebuild, dropped valve). Engine 3: a JK Preservation Parts "new" engine, aluminium case: 26k miles: new top end.
Gearbox rebuild 2021 by Bears.

1979 Westerly GK24 24 foot racer/cruiser yacht Forethought of Gosport.
1973 wooden Pacer sailing dinghy

[Wildthings]

If the float needle valve doesn't seal 100% that can cause this as well. Check to see if your dipstick smells of gasoline.

[Alexzeat]

[Wildthings]

Yes, if you are leaking gas past the needle valve when the engine isn't running it may well show up in the crankcase. A sniff test isn't super definitive, but is a good place to start.

[Alexzeat]

[Wildthings]

[Alexzeat]