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Date: Sat, 31 Jul 2004 14:45:54 GMT
From: Johannes H Andersen <johsnospamuooiaiosizefitterwiuoveswernuaz.com>
Subject: Re: After changing spark plugs I get lower gas milege


gogoasa wrote: > [...] > 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 My reply to the nospam reply: It is not worth while experimenting with other plugs since the DI system is designed around the NGK plugs. The NGK plugs are normally changed at 24k miles interval. They last well because of the automatic cleaning system. Reply to the thread: Another important issue is the torque required for the spark plugs. Naturally, the plugs should sit air tight in their holes, but some care should be exercised because of the aluminum head and the small diameter holes. It is easy to overdo it and damage the threads.

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