308 308qv problem - oil on the spark plugs? - Ferrari Life
 
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post #1 of 14 Old 06-27-2013, 05:04 PM Thread Starter
 
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308qv problem - oil on the spark plugs?

Hello
My beloved '83 won't start; first time in 7 years; always ran perfect. Checking the electrically etc; all good. Pulled a plug to check for spark...and it's covered with oil.
Now I'm nervous as this is the first time I've had to deal with a mechanical issue, and from my knowledge of cars (American although) this to me doesn't look good.
Thoughts/advice?
Kevin
Btw - also a thread on the other forum
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post #2 of 14 Old 06-28-2013, 09:12 AM
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Wolfgang is it covering the Electrode or is the Cam cover gasket leaking?
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post #3 of 14 Old 06-28-2013, 09:16 AM Thread Starter
 
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Thanks for the response; I learned that its a gasket leak that has left a little in the bottom area. When I unscrewed the plug it ran down onto the plug.
Looks like a gasket seal. Thanks
Kevin
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post #4 of 14 Old 06-28-2013, 09:49 AM
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Kevin- Oiled plugs can also be a sign of poor ignition that is not burning off any accumulation. Check for spark at the plugs to eliminated that possibility.

Even though the engine will not start, you can do a compression test with a simple tool and see if the rings or valve seals/guides are shot. If you get low compression and add some oil on top of the piston and it improves, ring problem. If you add oil and nothing changes, valve sealing problem.

Since she will not start, hopefully it is an ignition problem.

The pros can probably chime in with a more in-depth answer.

Taz
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post #5 of 14 Old 06-28-2013, 09:54 AM Thread Starter
 
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Thanks; I pulled a plug and checked for spark; it didn't have any. I'm going to check (& learn) about the ignition more.
It has always run strong and has fired right up.
Thanks
KEVIN
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post #6 of 14 Old 06-28-2013, 10:00 AM
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Kevin- That is a good sign. Ignition problems are much cheaper to fix than mechanical problems. There are some excellent upgraded ignition components available for the QV, too. Some of our pros can help you with that since they have experience installing those upgraded components.

Taz
Terry Phillips

Present: 575M 135171
Past: Dino 246 GT 02984, 365 GTB/4 14009, 308 GTS 25125

Every day I look around, and if nobody is shooting at me, it is a pretty good day.
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post #7 of 14 Old 06-28-2013, 10:08 AM
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Checking for spark in that way on any electronic system is very hazardous to the system and in itself can lead to a total ignition failure.

Proper diagnostic equipment is not made for the purpose of impressing our customers.

At least buy an inductive timing light. It is a reasonably cheap device that will test for the presence of a spark.


Also, on a QV you have two totally separate ignition systems. There are only two components that can cause both to fail. The RPM sensor and the ignition switch.


A non firing QV is usually fuel related.
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post #8 of 14 Old 06-28-2013, 10:31 AM Thread Starter
 
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Thanks; yes I'm treading very carefully as I diagnose this further.
Thanks for the advice
Kevin
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post #9 of 14 Old 06-28-2013, 10:35 AM Thread Starter
 
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Rpm sensor is located on the flywheel housing, correct?
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post #10 of 14 Old 06-29-2013, 08:41 AM Thread Starter
 
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For my own knowledge - why does it have two seperaely ignition systems?
Just curious
Thanks
Kevin
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post #11 of 14 Old 06-29-2013, 09:41 AM
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Quote:
Originally Posted by Wolfgang5150 View Post
Rpm sensor is located on the flywheel housing, correct?
Yes...at the 2:00 o'clock position

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post #12 of 14 Old 06-29-2013, 09:42 AM
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Quote:
Originally Posted by Wolfgang5150 View Post
For my own knowledge - why does it have two seperaely ignition systems?
Just curious
Thanks
Kevin
One reason is due to the speed of electronic technology (processing power) available at the time...

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post #13 of 14 Old 06-29-2013, 09:49 AM Thread Starter
 
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Thanks Dave
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post #14 of 14 Old 06-29-2013, 02:14 PM
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Like David said, the stuff was pretty crude back then, but even on the original 308 V8s, there were two distributors each running 4 cylinders. With points, it allowed for more dwell out of the distributor, although with CD ignition, all the points did was trigger the CD unit.

Even my 04 V12 and the latest V12s and V8s have two Motronic DMEs, one for each bank of four or six cylinders. Your engine is set up as two four cylinders on the same crank, unlike American V8s, which have cross-plane (90 deg) crankshafts. The flat/planar/180 deg crank on Ferrari V8s makes it easy to run them as 2 independent 4 cylinders.

Taz
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Present: 575M 135171
Past: Dino 246 GT 02984, 365 GTB/4 14009, 308 GTS 25125

Every day I look around, and if nobody is shooting at me, it is a pretty good day.
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