Blue/black smoke from exhaust

[farleyd]

I have a 1974 2.0L. The engine is pulling strong but there is
blue/black smoke at the exhaust when accelerating. The exhaust tip is
covered with black powder.

Any possible cause:
Pressure regulator?
Timing?
Rings?
Valves?
PCV hose return?

Thanks to a

[mejulihn]

You did not indicate if there are lots of miles on the motor or if it has been rebuilt recently. In the absence of any other symptoms, it sounds like the car is either running very rich or burning oil in the cylinders. I would try a compression check to rule out tired jugs.

[farleyd]

I presume it has around 140000mi, i just bought it and there is no indication that it has been rebuilded. Ill see that when i get the engine out. You tend toward the rings?

[Dave at Pelican Parts]

Blue is oil burning. Black is excess fuel. A sooty black exhaust tip indicates an overly-rich mixture.

Check your ignition system (timing, dwell, etc.), then your fuel pressure. Do a compression check and look at the color of the deposits on the spark plugs. I bet they're black and sooty--another indication of an overly-rich mixture.

Then start troubleshooting your fuel system. Not sure what could be doing this on a carb setup (jets, fuel pressure, other?). If you still have FI, then check that all the hoses are hooked up correctly. http://www.pelicanparts.com/914/technical_specs/914_20FI_diag.htm

Dig into Kjell's D-jet Guide http://www.914fan.net/djet.html .

Good luck!

--DD