Re: What is your plug type, make and gap? - Saab 9000 Bulletin Board - Saabnet.com
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Re: What is your plug type, make and gap?
Posted by aero guy (more from aero guy) on Mon, 9 Jul 2001 02:36:34
In Reply to: 95 Aero 5-speed with TCS bad idel, Rich, Sun, 8 Jul 2001 23:27:39
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NGK BCPR7ES is the correct plug and the aeros seem to like a gap of .8-.9mm for the smoothest idle. sometimes a very slightly fouled injector spray pattern can cause a skip not a strong miss but just a little tic of a skip. The 175 cylinder is of some concern, the compression should be the same +/-20 pounds. A low cylinder will cause an unbalanced power pulse and it will seem like a skip, Also as you come up on power the timing for that cylinder could change making you think you have a miss. You can short pins 2 and 3 on the TPS and this will retard spark to 2 degrees and not allow it to increase as you come off idle. if it is smooth at all times then you know possibly the low cylinder is causing some of the problems. Just a guess. You could have a little carbon build up which could cause a little skip when the engine is hot. I have tried to cover a range of posibilities. You could try a little Marvel Oil in your gas. will help the carbon and possible valve seating. and after a little while, go for a good run. This last suggestion is very old technology but it still works on some simple but anoying skips.
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