Subject: Re: Rough idle and a question Author: rv8flyboy : member since September, 2007 : 2970 posts Posted on: 2011-10-07 21:44:43

Some stuff I learned from my shenanigans a few weeks ago....

check the wire resistance of each spark plug wire. out of the 3 sets of 12, each set had at least one defective spark plug wire. the spark plug connector is ~5Kohms and the dizzy cap connectors are ~1Kohms.

The #6 ignition coil donut could be going bad.

O2 sensor going bad.

DK's not synchronized or getting stiff. This one is especially noticeable at idle as it is regulating very small openings. at highway speeds the small lag between, or difference in, opening is next to negligible.

have u tried pulling the MAF connector for each side during idle and see which side has a problem??

750IL 1990 (9/89) Black, 90K,


also currently stabled:
540 w. 6sp, 1995, Black

I told my wife, it is not a Boy Toy, is a Man's Machine!!

• Rough idle and a question - Rich 1990 750iL 2011-10-07 15:43:31 (158 views)
  • Got some improvement today - Rich 1990 750iL 2011-10-11 18:06:38 (117 views)
  • Re: Rough idle and a question - rv8flyboy 2011-10-07 21:44:43 (139 views)
    • And the mileage is down about 15% - Rich 1990 750iL 2011-10-08 07:08:19 (141 views)
      • Re: And the mileage is down about 15% - rv8flyboy 2011-10-08 10:39:18 (146 views)
        • so I swapped DK's one more time... - rv8flyboy 2011-10-09 01:53:08 (146 views)
        • Re: And the mileage is down about 15% - bernardbeemer 2011-10-08 14:08:48 (137 views)
          • or faulty fuel pressure regulators? (url) - shogun 2011-10-09 23:39:15 (122 views)
            • I swapped DK's this weekend ... again - rv8flyboy 2011-10-10 09:36:16 (109 views)