Wavering Idle and Dropping Voltage

Javier

As I had previously posted, I thought my problems where over when I discharged all the car capacitors. Wrong it cam back shortly after that, again the idle and the battery voltage fluctuating at idle. I found the true fix for this and you probably are going to think I'm nuts but here we go. When I replaced my original alternator that fried itself I followed the installation procedures in the manual under CHG (charging) in that section it tell you to go to EM (engine mechanical) to check tension. This is by checking the tensioner and making sure that it is between the lines as shown in EM-13. Here is where the fun begins, I found that my belt was at the last line which indicated it should be replaced. I had just replaced the belt 40k ago, then in EM-13 it says tension adjustment refer to : EM-139 DRIVE BELT. Wonderful, I go to that page and it states no adjustment needed self tensioning. I started my t/shooting again. I removed the serpentine belt. I found that the alternator stay item 6 on CHG-24 has the hole that attaches to the engine side elongated. It's not plug and play, I wedge a piece of wood between the alternator and the engine to force the alternator as far out as it could go. Then I torqued all the bolts, installed the serpentine belt and behold the tension was perfect in between the limits indicated by "B" on EM-13. I started the car and behold all perfect just like before my battery and alternator crapped out. No where does it tell you about the alternator stay adjustment. Now I do not know if a bushing or sleeve may have fallen out of my stay but from the pictures I have seen there are none. At idle the belt is hardly touching the pulley even with the tensioner in place. Its been a two weeks since I did this and all ok. So I loosened up the alternator stay and retorqued it without taking up the slack and the car started acting up again. So at least in my case I have confirmed the cause of my problems.3 batteries 3 alternators, 2 mass air flow sensors and numerous hours later it is fixed. Hope this helps some of you.

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http://www.the370z.com/members/javie...nator-stay.jpg

http://www.the370z.com/members/javie...-tensioner.jpg