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Date: Sat, 31 Jul 2004 13:19:06 GMT
From: "gogoasa" <someonenospamosoft.com>
Subject: Re: After changing spark plugs I get lower gas milege


"- Bob -" <nonamenospamace.com> wrote in message news:8o3ng0tfrosl9ps08765ko2c3ouv09r64vnospamcom... > On Sat, 31 Jul 2004 10:45:13 GMT, Johannes H Andersen > <johsnospamuooiaiosizefitterwiuoveswernuaz.com> wrote: > > >> NGK BCPR-6ES11 if it's a turbo. And gapped at 1,0 mm. > > Or, in the USA, 1.0mm :-) > > > >Agreed, but how to spread the message? NGK spark plugs look like 100 years > >old while BOSCH plugs look much fancier. Even worse, the Haynes manual lists > >Champion spark plugs for the car. > > Champion pays Haynes for the advertisement (also the color chart in > rear of those books with spark plug wear pictures). > > Actually there are a lot of others plugs that are listed for this car (check the internet), in my case only I could not find anything else than Champion at the auto parts stores (I was looking for something more expensive than 1.25$). And then I was going to the dealer to ask them to read my engine codes anyway (of course they are full right now, but I can try next week), so I just picked up 4 plugs NGK. Here is what I got in response at the same post on nospam: Welcome aboard and let me be the first to throw out a warning that you will no doubt hear 80 times in the course of this thread. Saabs are picky about their plugs! Since The Trionic engine management system was designed around NGK plugs and their particular characteristics, most people opt to stay with them. Most are convinced tiny variations between NGK and different brands of plugs make a big difference to the ECU. I'm not convinced...and that's why everybody loves me. You are driving a turbocharged car now...they are in general a tad more hard on spark plugs. Perhaps the reason your plugs seemed okay in your cavalier after 100k miles was because they may have been platinum. Platinum plugs last longer as they have a higher melting point than the nickel ones, but at the expensive of a bit more electrical resistence. The high heat in a turbocharged car will wear plugs faster, so the stock NGK plugs (nickel) go pretty quickly. Many of us here (notably myself) obsess about the plugs (thanks SPATL!) and rotate them out frequently. I bet I haven't had a set of plugs yet I've kept in more than 10,000 miles. Additionally, the gap on these plugs erodes relatively quickly. Pull those plugs out and make sure they were gapped correctly to begin with. Go with something between .035 and .040 inches for the gap. Anything more and you'll get a bit of a high boost misfire. You'll find Saab-friendly spark plugs are hard to find because of the fact that Saabs require resistor core spark plugs. Since Saab uses a direct ignition system utilizing a coil over plug system integrated into a cassette, there are no plug wires to suppress radio/electrical interference. Therefore, the the plugs themself use a resitor core to suppress spark energy and prevent it from bleeding back up toward the ECU. You MUST use these resistor plugs or ECU go BOOM BOOM. FYI, if you HAVE to use Bosch, Bosch makes the Super plug with a resistor core. Just check out the side of the box to make sure it says resistor core. bkrell

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