PeachParts Mercedes-Benz Forum - View Single Post - Worked on 300E, now it stalls with idle valve connected!

pawoSD · #7 12-04-2008, 10:37 AM

The grounds and wiring connectors all look ok, the car is a desert car, so there's no corosion on anything...

Only the fuse was bypassed....I haven't checked to see if the new relay-fuse has blown. The relay itself looked old/original.

I don't have a FSM for the W124....I have been going by what it says for the 1990 300SE W126.....I'd assume the engine/mechanicals are the same, it looks to be. I have a good multimeter/ohm meter. I guess the next step is to verify all sensors to be in spec....

I am pretty sure the cold start injector is working, as there was some fuel residue on its tip when I removed it. After the engine has been running/warming up for about 3-4ish minutes, there is a "click" sound and then it seems to idle a little slower (only slightly) but its noticable. What is occuring when it does this?

I will try to get the part number off the fuel computer, that is the larger unit in the back right? Does the fuel computer control the idle?

I'll also try disconnecting a vacuum hose with it running to see what happens.

Also, when I finally got it started the exhaust was smokey and smelled like unburned gas. Running way too rich I'd assume??

When just sitting there idling with the valve unplugged the exhaust smells normal and clean.....and it runs/accelerates great. If it starts good cold then maybe I will just leave the valve unplugged.