Starting a 412

[Oliver]

Thanks for replies,
Turning distributer by hand and listening to tick-over is how I adjust timing and using timing light.
However, I reckon now that camshaft + chain are worn out. When cold ignition moves about all over, so hard to get a good reading. When warmed up, engine revs scream, so must be getting fuel and good spark
I've concentrated on fuel pump & carb & ignition and hadn't thought of other essentials like valve timing.
It doesn't look like an easy job to replace camshaft with engine in the car.

[412usa]

Tuning the 360 engine is more complicated than you might imagine and I strongly suggest you get hold of the chrysler manual suggested by Stefan.

Ignition is of course only part of the problem. Fuel ration, air leaks from the multiple vacuum lines, ballast resistor issues etc. If all the above are correct one simple issue is to follow the owners manual on starting proceedure. You must press the throtle to the floor to set the choke. Once started allow the engine to run for at least 35 sec at fast idle then tap the throttle to release the fast idle control.

Although not entirely related I have found that installing a geared started has much improved starting not least by filling the float bowls faster after an extended period of not starting.

You don't mention if you car still has the turbo attached however I'm not sure this makes much difference to the problems you mentioned as it is only effective once the bypass is closed

[Oliver]

Hello,
I think I've finally found a reason for problems starting after scratching my head thinking of every possible fault.
The choke on starting opens completely - instead of slowly as temp. rises.
The carbs a Carter Thermoquad with a "divorced" choke.
Before starting the choke plate is closed and you can feel spring pressure opening it and it closes shut as it should.
Once I manage to fire engine up it falls wide open and have to rev very fast to keep engine going, if at all.
Once engine is stopped after about 5-10 minutes it somehow closes and all looks as normal.
I'm assuming it's a fault with "divorced" choke on inlet manifold.
Having a turbo it's pretty hard to get access and might be difficult to get a replacement as the connecting rod is longer than on a standard choke.
Anyway next step is to take it apart and see what needs doing.
If anyone's had this problem and knows what to do, advice would be welcome.
Thanks

[dwomby]

I can't help with advice but congratulations on successful sleuthing.

David