(Login LSfour) ACSA Forum Users from IP address 198.54.202.234
Does anybody know what saprk plugs I should use in my 93 S4. I took out the current plugs to check the code and it seems they are NGK BCPR7ES. This does not look like the tungsten plugs the agents sell, but I suppose they don't cost R1000 per set either. Any thoughts ?
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Leon, use only Bosch F5DPOR plugs. I tried NGK Iridium and the car ran very poorly! On the Bosch plugs it flies. They are expensive but it is worth it.
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I read on the forum archives that leaded and racing fuel doesn't work that well with platinum plugs. Is that correct?. I run racing fuel all the time otherwise my car pings like crazy on the current boost levels. (+- 1.4 bar midrange then down as it revs) Do you still recommend Bosch F5DPOR?
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@Leon, leaded fuel will most probably cut the life of a platinum plug (and a lambda sensor) by half. I just replace the plugs and lambdas more often. I still use the Bosch plug as it works the best!
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You can test with VAGCOM or a multi tester - if you want I can check that for you. But if you have been using leaded and haven't replaced the lambda in the last 50,000 km, it probably is gone.
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You can get the lambda from Audi - ask for trade discount! You can also try Diesel Electric - they distribute Bosch in SA.
I have mailed you the testing procedure from the Audi Manual.
There are three wires that come out of the lambda - the two white ones are for the heater - the black one is the sensor wire. Connect the AFR gauge to the connector on the lambda side - do not cut any wires. THe ECU should not have any problems.
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