Got a 93 300e that coughs and backfires thru the engine compartment. New fuel filter, MAF one year old, running premium fuel. Idles fine and revs up good in neutral, but under load it likes to "Pop" under the hood. Need to build a code reader. Have 16 pin near battery. I have code sheet but don't know how to use a reader. Engine running or off? When and how do I push the momentary switch?

Fixed the problem with a new #1 coil, made a code reader to figure it out. I now sell code readers on Ebay for $32. They work good and include code definations and instructions.

http://cgi.ebay.com/ebaymotors/Mercedes-Diagnostic-Code-Reader-W124-300e-and-others_W0QQitemZ330387628521QQcmdZViewItemQQptZMotors_Automotive_Tools?hash=item4ceca321e9

(Fixed now) Very annoying. Suggestions appreciated.

Sincerely,
Rick Potter
Potters Barber Shop
Osage City, Kansas