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1980 Porsche 928
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1980 928 running very horribly
My 1980 928 started running really badly a week ago, you start it up and it idles up and down at times. Sometimes it will stall, but you rev it in park and it seems to do alright, sometimes it's not very steady. And when you put it in drive the car just stalls or you gotta tap the pedal as fast as you can to keep it moving. So what do you think is wrong with the engine? Bad timing? Clogged injectors?
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08-04-2013, 04:10 PM
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Registered User
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vacume leak
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08-05-2013, 02:58 AM
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1980 Porsche 928
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Where are all the possibilities it could leak from?
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08-05-2013, 05:32 AM
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Registered
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Check the rubber connectors between the spiders and the air intake. I had one in particular that had cracked and caused the same symptoms. I replace all 8 and the problem is gone.
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Mike 1982 Porsche 928 Auto Black on Black - Competition Package |
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08-05-2013, 08:23 AM
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1980 Porsche 928
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Will do
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08-05-2013, 12:02 PM
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1980 Porsche 928
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Okay I checked out the rubber connectors. They all look good, now it won't even start. It fires and if you give it gas it starts to run a little and dies right away. It puts out some really nasty smoke too. Do you think it is a clogged fuel filter or still a vacuum leak? My brakes were having trouble releasing pressure so could a vacuum leak explain engine problems and brake problems? I'm totally lost
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08-09-2013, 12:17 PM
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1980 Porsche 928
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You guys got any ideas?
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08-10-2013, 02:52 PM
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Kool
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Best bet, being a CIS car....remove the spider, and replace every single vacuum hose, fuel hose...then change the fuel filter...check pumps to make sure they are running (1 of my pumps was seized...new right out of the box), check the in tank strainer, if you have one, and check the little filters in the fuel distributor. I removed mine. I think there are some pics in my "it's alive" thread...
If you don't have CIS, then don't F with the distributor....but do the vacuum lines..there are quite a few under the spider.... Good luck...don't let it whup ya!
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Ron 1978 5sp (#30) project-Wreckscue, 1979 5sp Euro Project 1982 5sp resto project, 1985 Auto S3 1984 Parts car (the fire car) 1987 s4 (parts, or maybe project) (Yes, I now have 4 project Sharks) |
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08-10-2013, 05:00 PM
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1980 Porsche 928
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I think I fixed it. Mechanic it had been sitting at put cheap ass spark plugs in and they were ruined. Seems to fire right up now.
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08-10-2013, 05:22 PM
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Kool
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Niiiice.....mine had platinum in it when I got it...would not fire...found some NOS Bosch, and it fired great.
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Ron 1978 5sp (#30) project-Wreckscue, 1979 5sp Euro Project 1982 5sp resto project, 1985 Auto S3 1984 Parts car (the fire car) 1987 s4 (parts, or maybe project) (Yes, I now have 4 project Sharks) |
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08-11-2013, 06:57 AM
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1980 Porsche 928
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I was thinking about putting iridium plugs in it.
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08-11-2013, 03:36 PM
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1980 Porsche 928
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I have determined that I'm not getting spark.
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08-11-2013, 05:53 PM
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Kool
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Advice I got was use good old copper core...that is what she was designed to use.
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Ron 1978 5sp (#30) project-Wreckscue, 1979 5sp Euro Project 1982 5sp resto project, 1985 Auto S3 1984 Parts car (the fire car) 1987 s4 (parts, or maybe project) (Yes, I now have 4 project Sharks) |
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08-11-2013, 06:32 PM
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1980 Porsche 928
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Well it's not running at all now. It will crank, and fire occasionally. But die instantly. Doesn't sound like its firing on all cylinders. Thought it might be a gas problem. Poured a little in intake but it still did not fire. I'm thinking it could be something with the distributor or ignition coil. Any ideas?
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08-14-2013, 09:42 AM
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1980 Porsche 928
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Okay I got it running after cleaning the end of the green wire with contact cleaner. What exactly does that wire do?
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08-14-2013, 10:18 AM
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Petie3rd
Join Date: Jul 2000
Location: Philly PA
Posts: 4,528
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hint go invest in a new green wire,
it will last for as long as you own the car, and the car will always start. Odds are the old wire is more than 25 years old, and its a number 1 contributor to a 928 engine not running link the threads Side effects of a bad green wire in a 1980
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^^^ Stan ^^^ 2019 BMW K1250 GS 2016 HD RK 1988 S4 Auto , Elfenbein Perlglanz, Pearl Gray 1982 5sp Met black and tan sport seats |
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08-14-2013, 11:02 AM
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1983 porsche 928
1972 chevy corvette
1982 Porsche 928
Race Car
TBA
Whitey
Pontoon
