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82 Euro S spark plug analysis needed
I have an 82 Euro S CIS 5spd that I have recently freshened a bit. The engine now has new rings,seals and heads redone. I am working on getting the fuel pressure gauges to look at the A/F mixture. These are the plugs after the first 50 miles(#1 plug I cleaned black soot off rim 25 miles ago). The car stumbles and has no power. I could have some bad injectors. Can anyone tell me whats going on in the cylinder head by looking at these plugs? I think it shows too rich and some cylinders not getting fuel(or spark).
  
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82 928 Euro S 5 speed, sport seats,Moss Green/Champagne 04 996 C4S conv tip Polar Silver/Metropol blue |
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03-09-2011, 02:22 PM
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Dang with all that work, I thought you replaced the Injectors already. Trash those things and either get some OEM ones or get the Bosch Mercedes the Russ, Rjm65 and myself use. I didn't know you were using the old Injectors.
Replace them ASAP
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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** 
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03-09-2011, 02:29 PM
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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**
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03-09-2011, 02:32 PM
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Quote:
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82 928 Euro S 5 speed, sport seats,Moss Green/Champagne 04 996 C4S conv tip Polar Silver/Metropol blue |
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03-09-2011, 02:36 PM
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Replace them all at the same time. All new will all have a good spray pattern. They are about $20 each at Auto Haus AZ dot com
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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**
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03-09-2011, 02:41 PM
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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**
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03-09-2011, 02:44 PM
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take it from the others..replace those injectors....dont fall for that refreshed/overhaul hog wash...new MB are half the price of the Porsche part.
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John ......... 1978 Porsche 928 5sp LSD 1982 porsche 928 5sp LSD |
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03-09-2011, 04:10 PM
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Look into using the regular copper plug too. The Platinum is great if you don't want to change them for 100k but copper is a better conductor and has a better spark.
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1979 928 85 Euro 2v motor,S4 Brakes and suspension, 1988 951 street legal track car(sold) Neon SRT4 track car |
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03-10-2011, 04:36 AM
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most likely injectors but have you tested your plus leads with an ohm meter?i have a similar problem with my 81 at the minute,albeit to a much lesser extent.with mine only two out of the nine leads have a reading from them the rest i assume are open circuit (30 yrs old probably) i wonder if a bad lead giving a weak spark to your new plugs could cause it to run rich? i assume your air filter is new?have you checked fuel pump delivery pressure
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03-17-2011, 12:41 AM
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82 928S Euro 5spd
1978 Porsche 928 4.5
1988 Porsche 951
