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1980 Porsche 928
 
Join Date: Mar 2013
Location: Dayton Ohio
Posts: 278
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1980.keeps fowling first 4 spark plugs.

My car will be running and then it will die on you and you'll crank it and It'll fire a little bit and just stop. Everytime I pull the first two spark plugs on each side they are covered in a black, gassy smelling stuff. So I clean them off and then it still does not start. It seems like they aren't sparking to me. I've got it running again somehow before but after a couple days it dies again. Has new gas in it. It shoots out some nasty smoke when you try and start it and it doesn't start. Not sure what Exactly it could be. I was going to replace all the ignition wires and distributor and rotor.

Old 08-24-2013, 06:57 AM
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Black gassy stuff? How about some pics of this? Is it oily or hard? Hard would mean your getting spark and burning rich. Oily would be valve seals. Is your oil new? How much has this car been ran in the past few months?
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1981 Porsche 928 "Euro" Auto Gunsmoke Metallic Flat - Black Interior
1983 Porsche 928S "US" Auto Light Bronze (Copper) Metallic - Brown Interior **SOLD**
Old 08-24-2013, 07:15 AM
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1980 Porsche 928
 
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Location: Dayton Ohio
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It's an oily black. I will upload pictures later. It has only been ran a little bit in the driveway and around the block. Not on many actual drives.
Old 08-24-2013, 07:31 AM
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1980 Porsche 928
 
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The oil is new, yes. Not even 10 miles on the new oil.
Old 08-24-2013, 07:32 AM
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Is all the cooling parts working, cause sometimes you just need to run these cars and get them up to temp to get those old seals to soften up and seal again. Run it and run it long.
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1981 Porsche 928 "Euro" Auto Gunsmoke Metallic Flat - Black Interior
1983 Porsche 928S "US" Auto Light Bronze (Copper) Metallic - Brown Interior **SOLD**
Old 08-24-2013, 07:40 AM
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1980 Porsche 928
 
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Location: Dayton Ohio
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I can't get it running at the moment. I've left it running for about an hour at most before. Do you think the valve seals are bad? That sounds like an exspensive repair that I really do not want right now. I believe all the cooling parts work, it stays steady at the third line when it does run. I will attempt to get it running again. Is runs pretty damn good when it does run.
Old 08-24-2013, 07:43 AM
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1980 Porsche 928
 
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Cleaned up the distributor and wires and now it fires right up but it's idling at only 400 RPMs! What the hell!
Old 08-24-2013, 09:05 AM
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Quote:
Originally Posted by mixybro4 View Post
Cleaned up the distributor and wires and now it fires right up but it's idling at only 400 RPMs! What the hell!
If it's not burning right the RPM will be lower. I would certainly make sure you are getting good spark. My car is not an 80 but you need to determine how good a spark you are getting and also the timing is correct. I wonder, is blue smoke coming out the exhaust? How many miles on the motor? You could have a oil problem as mentioned earlier. There is a way to determine if seals or rings but I forgot how to do the test. Check the easy things out first.
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Old 08-24-2013, 09:18 AM
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1980 Porsche 928
 
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Blue smoke? No. Miles =73665.

Before it was running around 1200 RPMs and after I cleaned all distributor wires it starts right away and runs at about 400. You can give it gas and it revs smoothly, properly. The timing should be correct.
Old 08-24-2013, 09:26 AM
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1980 Porsche 928
 
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How do I determine spark
Old 08-24-2013, 09:26 AM
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have you replaced the green wire?
is it green or brown?
how do the green wire connector ends look?

How fresh is the fuel in the tank?
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Old 08-24-2013, 10:02 AM
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Is this a k-jet car? If so, injectors, fuel distributor.....I am still toying with a miss, but I had a near identical issue...changed my injectors, then kept toying with the CIS....ain't quite right yet, but way more better....once all the components are solid, then you can mess with he idle control....I am guessing maybe a plugged injector or two....
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Old 08-24-2013, 10:05 AM
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1980 Porsche 928
 
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The green wire has not yet been replaced. I tried to clean the ends with electric contact cleaner. The wire is the original though. I suppose the ends could be in better condition, and the wire itself. The fuel is brand new. 6 days. It's an L jet car though. It's got a good new fuel computer and relays.
Old 08-24-2013, 10:21 AM
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please replace the green wire before further testing is done
Also if the ignition wires are old replace these as well.

While your waiting for your new green wire,
remove the fuses and clean them with a pink eraser,
do all of the relays as well.
Clean the battery terminals and the ground strap connections
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Old 08-24-2013, 11:23 AM
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1980 Porsche 928
 
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All fuses and entire circuit board was cleaned. All car grounds have been cleaned too.
Old 08-24-2013, 12:27 PM
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OK then

please replace the green wire before further testing is done
Also if the ignition wires are old replace these as well.
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1988 S4 5 sp, Black / Black leather/ Carmel carpet
Old 08-24-2013, 01:50 PM
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1980 Porsche 928
 
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Green wire and ignition wires in the mail. What to do until then?
Old 08-26-2013, 06:42 PM
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Check timing belt? (ie timing may be a tad off)
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Old 08-28-2013, 01:52 AM
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1980 Porsche 928
 
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Put new green wire in and new distributor and rotor and now it won't fire at all.
Old 08-30-2013, 07:56 PM
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928: Serial Enabler
 
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Pictures. What was source of green wire?
Can you show picture of distributor, with cap off, at TDC position on crank.

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Old 08-30-2013, 08:28 PM
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