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Old 02-25-2010, 08:36 PM
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bluebee bluebee is offline
Seek to understand,^Value
Location: San Jose, California
 
Join Date: Mar 2008
Posts: 21,234
Mein Auto: 02 BMW 525i M54 auto 130K
Never one to shirk my duty (and stick my neck out) ... I'll make the first pass at what below satisfies BOTH requirements of being (probably electrically) reset with the next ignition cycle and affecting a single cylinder #4.

1--bad fuel (no on both counts)
2==trash or gunk in fuel (no on both counts)
3---spark plug valve cover seals (yes on only one count, no on the other)
4---head gasket leak, or cracked block (yes on one count, no on the other)
5---bad plugs (yes on one count, no on the other)
6==coil pack or boot (yes on one count, maybe on the other)
7---bad 02 sensors (no on both counts)
8---bad maf (no on both counts)
9---bad injector (maybe yes on only one count, maybe no on the other)
10---crack ring (yes on one count, but certainly no on the other)
11---cam shaft sensor (hmmm... if there is only 1 sensor, then no on both counts)
12==crank sensor (hmmm... same answer as cam sensor)
13---bad ground wires (yes on one count, probably no on the other)
14--- bad fuse or relay (no on both counts)
15---bad wireing (yes on one count, probably no on the other)
16--- dme, or ecu (yes on one count, maybe on the other)
17--intake manifold gasket leak (yes on one count, no on the other)
18--ccv--aka pcv (hmmm ... methinks no on both counts)
19--icv--idle control valve (hmmm... don't know enough to say)
20--tps==throttle position sensor (seems to be no on both counts)

Please correct me where I'm wrong - but very few things in that list which are known to cause a misfire will satisfy (IMHO) the reported conditions of being reliably reset with the next ignition cycle and affecting a single cylinder.

Please feel free to correct me if I am wrong.
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