Pagoda SL Group

W113 Pagoda SL Group => Drive train, fuel, suspension, steering & brakes => Topic started by: cfm65@me.com on June 22, 2017, 03:39:09

Title: 250SL Auto running rich
Post by: cfm65@me.com on June 22, 2017, 03:39:09

Hi Guys,
Over the past few weeks, I managed to get my 250SL Auto running quite well and have biult up a reasonable understanding of the fuel injection system.
However, all of a sudden and without any provocation, it started running very rich. It is not the cold start solenoid or the cold start valve. Fuel injection pump oil level up to the line.
Any suggestions will be much appreciated.
Regards
Chris

Title: Re: 250SL Auto running rich
Post by: ctaylor738 on June 22, 2017, 12:12:05

It sounds like you need to expand your understanding of the injection system to include the Warm Running Device aka the Won't Run Device.  The plunger may be sticking in the cold/rich position. Plenty of information on this.

Another possibility is a plugged fuel return line.

Cheers,

CT

Title: Re: 250SL Auto running rich
Post by: cfm65@me.com on June 22, 2017, 17:09:20

Thanks,
Your advice is much appreciated.
Regards
Chris