Black smoke is unburned fuel, typically because the fuel is not atomized properly or because too much fuel was injected for the amount of available air. Since it runs good with boost, it sounds like the second scenario.
As I recall, the ALDA pushes a rod down into the IP to decrease the amount of fuel injected. Assuming too much fuel is being injected, I'd suspect some problem with the ALDA. The ALDA is supposed to sense boost pressure from the intake manifold and then retract the rod to increase the quantity of fuel injected. I assume you did verify that the IP is nor 360 degrees out of time. Bad injectors will produce smoke and lost power and also noise. But that doesn't explain good function under boost. -----Original Message----- From: Mercedes [mailto:mercedes-boun...@okiebenz.com] On Behalf Of Mike Esh Sent: Friday, June 28, 2013 7:48 AM To: Mercedes Discussion List Subject: Re: [MBZ] Black smoke and loping at idle. Thanks for the help Mitch. I have not changed the Alda yet, I plan on trying that and different? injectors after work today. Michael E. Esh On Jun 28, 2013, at 07:43 AM, Mitch Haley <m...@voyager.net> wrote: > Other info for those who forgot the history: > This car did not smoke when the original pump was in it a few weeks ago, it was > running fine on WVO when I saw it. > > It had a lot of WVO run through it, and had been stalling when hot, would run > again if he threw cold water on the IP. > > I sold him a 123 IP, probably from a '81 wagon, that had been sitting in a box > since I bought it on eBay several years ago. It ran so badly on my IP that > several people wondered if it was 360 degrees out of time. > > Mitch. > > _______________________________________ > _______________________________________ http://www.okiebenz.com For new and used parts go to www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com _______________________________________ http://www.okiebenz.com For new and used parts go to www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
