Pagoda SL Group

W113 Pagoda SL Group => Drive train, fuel, suspension, steering & brakes => Topic started by: ctaylor738 on June 21, 2014, 16:05:00

Title: Unlikely cause of poor running
Post by: ctaylor738 on June 21, 2014, 16:05:00

1967 250SL with a complete crap-out at 3000 rpm and bad stumbling on hard acceleration under that.  Pertronix with Bosch blue coil.  Checked fuel pump output (good), tinkered with timing and linkage adjustment (made small difference).  Checked electrical connections.  Voltage to coil good.  Coil resistance good.  Plugs looked good.  Suspected the off brand plug wires with 11K ohms resistance and was just about to order a set, when I noticed a large original-looking capacitor on the + side of the coil. 

Disconnected it and all was suddenly good.  No stumbling, happily went to 6000.  Go figure.

Cheers,

CT

Title: Re: Unlikely cause of poor running
Post by: ja17 on June 22, 2014, 12:24:38

Yes, those "radio static filters" sometimes do go bad. A problem hard to diagnose. Good Job.