bad starting after a drive ...

[swiss_wb]

Hi Forum

it's been a while since I've been here ...
Car is finished and driven all day during summer ...

https://www.foscan.ch/holden/holden_wb.png

I experience some hassle from time to time starting the beast after a longer drive and a short break.
As example, I drive around 30 min to 45 min and go for a refill at the gas station. After I switch off the engine for about 5 min, it won't start.
It turns over normal, so I guess the starter motor and the battery are not the problems here ...
After a couple of minutes, when the engine or carby is cooled down, it starts right away.

I changed a couple of things:

- ignition coil (it's one of that things that sits on the rotator)
- interrupter (the electronic thing in the rotator)
- spark plugs and spark plug cables
- changed the feed of the coil to a relay based feed right of the battery

https://www.foscan.ch/holden/IMG_9246.JPG

so what could still be wrong?

Is the carby too hot and the gas boiling?

Cheers to downunder
Swiss_WB

[swampy]

hi
double post

[swampy]

hi
Change needle and seat ,these can dribble fuel in after shut down .
Secondary but important is check fuel pressure when running
Disassemble carb and check float level .

Ignition rarely causes hot start issues . OH YEA --never tie the plug leads together always use separators ,to prevent crossfire .

Install a block off plate for the egr . Build up of carbon in the inlet manifold and combustion chambers will eventually cause issues .

Check inlet manifold for vacuum leaks first by solvent spray on gasket areas then smoke test .

[Smitty2]

Hi Forum

it's been a while since I've been here ...
Car is finished and driven all day during summer ...

https://www.foscan.ch/holden/holden_wb.png

I experience some hassle from time to time starting the beast after a longer drive and a short break.
As example, I drive around 30 min to 45 min and go for a refill at the gas station. After I switch off the engine for about 5 min, it won't start.
It turns over normal, so I guess the starter motor and the battery are not the problems here ...
After a couple of minutes, when the engine or carby is cooled down, it starts right away.

I changed a couple of things:

- ignition coil (it's one of that things that sits on the rotator)
- interrupter (the electronic thing in the rotator)
- spark plugs and spark plug cables
- changed the feed of the coil to a relay based feed right of the battery

https://www.foscan.ch/holden/IMG_9246.JPG

so what could still be wrong?

Is the carby too hot and the gas boiling?

Cheers to downunder
Swiss_WB

car got a GM/HoldenQuadrajet carb on it..??? pic is unclear

if so, known problem with old Quaddies .... the float bowl well plugs allow fuel to leak in to
the manifold when the engine is stopped AND HOT (does not happen when cold)

fix... ? remove carb and peen over well plugs or cover with DEVCON or similar

[GtoGeoff]

Next time.....
Before starting, remove air cleaner. Using a torch, while looking into the primary throttle barrels, actuate the throttle. You should a fuel stream from the acc pump. No stream, means no fuel; either it has evaporated/boiled out or leaked out.

If you DO get fuel, it could still be fuel boiling or spark related.

[swiss_wb]

Hi

Thanks for the hints, will check for fuel in carby and manifold.
Will also check for the carby model...

Cheers Swiss_WB

[guy incognito]

Can you fit an insulating spacer between carburetor and manifold?

Even something 1/8" thick is enough to be useful.