[Lorenfb]

"a) erratic part throttle misfiring and rpms cutting out at high rpms over 6000 rpm. Cause: 1 or 2 bad fuel injectors found as verifed by a IR temp reading off each header."

Then the 2 cylinder are dead and can't melt the spark plug.

"b) high rpm cutout. Cause: due to overgapped flywheel sensor past 0.8mm, or aftermarket flywheel pin requiring a closer sensor gap to not cut out."

Again, then no spark damage.

"c) rpm misfiring and cutout at load and upper rpms. Cause: overzealous spark plug gapping causing the spark to not fire"

Then just drop cylinder with not damage to plugs.

"d) random misfiring or cutouts. Cause: Failing/defective DME unit or DME relay causing intermittent spark or power"

Same as above.

"e) lean running condition and misfiring and cutouts at high rpms. Cause: Cars were an engine transplant with a non-Carrera tach converted by XYZ Speedometer that overdrove and blew out the IC in the Motronic DME - VERY COMMON!"

NOT TRUE! The tach output can be shorted to ground or +12 and no damage to
the DME ECM operation. The tach output is a buffered output. Just look at the schematic!

"i) 3.6 engine power lacking and peaking at 5500 rpm. Cause: faulty resonance valve operation"

Both engines are 911 3.2s. Guess again!

"Cause: faulty WOT switch or car is not achieving full throttle, only opening 2/3'rd"

Owner indicates that WOT mode caused the problem. Guess again!

"l) air/fuel ratios coming in at the lean end of the statistical range. Cause: air flow meter previously tampered with and internal clock spring tightened for whatever reason previous. Sometimes also done on grey market cars by the importer to lean out the mixture."

Owner indicates that WOT mode caused the problem, so the AFM inputs were
ignored, i.e. on the WOT map. Guess again!

"m) same as above but coming in very rich overall. The converse of the above where the air flow meter as tampered with and clock spring loosened, probably someone's attempt to 'tune' the car"

Again, owner indicates that WOT mode caused the problem, so the AFM inputs were
ignored, i.e. on the WOT map. Guess again!


Bottom line: Please, no more guessing!