Rough ride with my 911 SC

ARVZ82SC · 09-08-2006, 05:54 AM

Hi there im pretty new to this forum, I have purchased a 82 911 SC and have been working on it like crazy recently. I went about giving it an oil change, changed the distributor cap, spark plugs, blower and just basically cleaning the car up. The other day I was driving it and I noticed the car jerking, when I hit the gas, sometimes is seems like it is misfiring. It hesitates to go when I hit the gas. Other times it goes fine, but when the RPM's are over 3000 the car runs a lot better. Its pretty much when I shift to a gear and speed up early in the gear, thats when is misfires. When I leave the car sitting for a couple days or so and turn on the car black smoke comes out for a second. But if I were to turn it on everyday, everything is ok starts fine. Is that normal? Also the air comming out of the exhaust smellls like crap haha, I know its an old car but any solutions I am looking at getting some new ignition wires the ones on the car look horrible, also I bought a fuel pump havent installed it yet, hope it will help. Your suggestion will be of big help. Thanks -Arvin

ruf-porsche · ruf-porsche's Garage

Black smoke after the car been sitting for a couple of days, you got leaky injectors.

JohnJL · 09-08-2006, 06:01 AM

Keep it over 3000 RPMs ;-)

petrolblue83911 · 09-08-2006, 06:50 AM

is it like that all the time or only when the car is cold or warm?

stlrj · 09-08-2006, 07:51 AM

Take it in for a mixture adjustment.

jason2guy · 09-08-2006, 08:46 AM

could be a couple of things. where do you live? im in the valley if youre close i could take a peek and tell you what i think.

brendon · brendon's Garage

I have been having similar problems - drained my tank of all the reformulated gas and put in some 100% real gas and the problems got much better. A few more tanks of real gas and mine should be cleared up.

David 84 911 · David 84 911's Garage

I had a very similar problem however maybe (or maybe not) a little less pronounced...it was solved today with a new Oxygen sensor from pelican parts. Try disconnecting your O2 sensor temporarily, if it solves it, you need a new one....

Gunter · Gunter's Garage

Arvin: The stalling when shifting in low RPM is mixture related.
Before you go for a mix-adjust, set the valve clearance.
Do a tune-up and keep a log.
Valve adjust. (You'll need the special feeler gauge)
Mixture adjust. (You'll need the 3mm Allen key)
Timing. (You'll need a timing light)
Of course, good plugs, ignition wires, cap & rotor is a must.
Smoke on start-up after sitting for a few days is normal with these engines.
A Bentley SC Repair Manual can be of help to learn more about CIS etc.

ruf-porsche · ruf-porsche's Garage

Blue smoke on start up is normal due to design of the engine, boxer configuration, but black smoke wouold indicate too much gas, which could be leaky injectors.