Cold Start, high rev and smoke Issues...

[WTF D00D]

I know, I've done a ton of searches on here but come up with so much I haven't found the answer.

I've had the M35a2, 1968 model for about 6 months now. I've been trying to drive her on a nearly daily basis at least a little bit to get her used to daily driving and to make sure everything is sound.

The only issue I have is sometimes after sitting 3+ days, at start, she will rev kinda high and belch black and gray smoke for a few second then drop down to normal idle and everything is fine after that. Other than that she runs amazingly, she only has 12k miles and 1400 hours.

Anyone have this same issue or might know whats happening?

Since I've had her I have not changed the fuel filters or oil filters yet. I have the filters and plan to do the fuel filters today but wainting on oil filters till I purchase the oil.

Thanks for any help folks...

 

[Heath_h49008]

Revving and smoke would indicate fuel/engine oil. If you're not hitting the throttle, then it's getting in there via another means. This could be minor, or it could lead to a runaway and the big boom. These are the locations I can think to check where oil/fuel might get dumped into the cylinder during starting/resting or pool in the intake while sitting. I'm sure the other guys will chime in with better ideas, but it's a place to start.

1. Flame heater injector dumping fuel into the intake.

2. Fuel injectors leaking as she sits.

3. Turbo intake side bearing leaking oil.

4. Valve seals leaking oil while it sits.

 

[Carlo]

I would say fuel filters more than anything. Start there.