Oil Contamination with fuel?

Ok.... Took my '74 911 Carrera Euro to be tuned up to pass emissions. Mechanic said the car was "dumping gas" and it was over 10% on the emissions analyzer machine. He did alot of fine tuning to the MFI (Mechanical Fuel Injection)... timing and points to get the car to run balanced and pass emissions.

Here is the problem..... he said the oil was a low when I bought it in (due to being misled about the oil gauge) and that it was extremely dirty..... Thats that. Took the car home... ran great. Two weeks later the car starts bucking and drowns out. I let it sit on the side of the road while calling a tow truck and went back... the car starts and purrs once again. Tried to move the car... drowns out again and stalls after 200 yards.

Here is where it get interesting. Tow truck man highly reccomends a different mechanic... I go to him and he targeting the amplifier but finds that the oil is contaminated with fuel and the car is running way too rich and blowing blue smoke.

My qeustion (finally).... Should the oil have been changed before any adjustments were made to the balance of how the car runs?

Did the first mechanic screw up by not changing the oil... maybe it could have been contaminated before he started tuning. This $350 tune-up is now costing me $500 more. Who do I believe?

Any input here is greatly appreciated.

John

Sometimes to pass smog you need to make ajustments to your fuel air mixture and your car will be running very poorly, after it passes you adjust it back to were it was running good originally
If your car is billowing blue smoke you may have overfilled your oil tank , check behind your air cleaner in the intake box for oil.
Dirty oil has no bering on your emmissions or how your car will run, provided its not so dirty its like syrup it does save lots of money on parts that wear prematurely though
[This message has been edited by jryerson (edited 04-23-99).]

[This message has been edited by jryerson (edited 04-23-99).]

[This message has been edited by jryerson (edited 04-23-99).]

The previous post is correct about the oil being to full. Most people (non-Porsche owners) don't know that you need to check the oil level when the engine is up to operating temp.

As to the emissions adjusting, the rumor of it running like crap to pass is only true with early model American cars. Since 1970, Porsche has tuned the cars to the applicable emissions standards. If the car does not pass, it needs a tune up anyways. Any adjustment that gets it to pass and the engine still runs bad is not a good adjustment.

Fire that moron wrench. Get someone who knows what the heck they are doing.

Good Luck.

Does the '74 Carrera have Mechanical Fuel Injection, or CIS?

[bavaria911]

Is this the oldest post on Pelican?

[temo79]

Originally Posted by bavaria911

Is this the oldest post on Pelican?

I think so, seems 1974 cars needed to be tested for emissions...