Hello everybody,
I acquired a 1989 190E 2.6L M103 close to a year ago, and have always had problems with it idling. I could never get it to reverse without me holding my foot on the gas pedal. Drive would also often cause shudders/bad engine vibration. Starting in the cold was next to impossible. After much speculation, I went ahead and tore out the fuel distributor (old diaphragm had multiple needle holes in it and was well deformed), ordered a rebuild kit, put the distributor through ultrasonic cleaning, changed out the 6 metering o-rings, cleaned the barrel filter, regreased the plunger with WD40, new barrel o rings, new EHA valve orings, took great care in aligning the discs and springs, and went to install in the car. Well, that got me a no start. after finaggling with the air/fuel mixture screw, I got her to start, but she ran like dogshit. I don't have a multimeter capable of duty cycle so I'm working in the blind here. It got to the point were I thought it could idle well (economy meter pretty much pegged tot he left in park, only slightly off when in reverse/drive). Boy was I wrong. I went for a test drive, and I couldn't give it any throttle without it dying, popping/banging. It smelled of gasoline and just died, so I'm thinking it got flooded. I did a cursory google search, and somebody recommended to disconnect the leads to the EHA valve. I went ahead and did that, and wow, the car runs perfect. Even cruise control works now (inop before) What is the deal with the EHA valve? It's not leaking from visual inspection. Could it be something as simple as reversing the lead connections? I didn't care to find out....the car ran so well without it being connected. Where to go from here?
I acquired a 1989 190E 2.6L M103 close to a year ago, and have always had problems with it idling. I could never get it to reverse without me holding my foot on the gas pedal. Drive would also often cause shudders/bad engine vibration. Starting in the cold was next to impossible. After much speculation, I went ahead and tore out the fuel distributor (old diaphragm had multiple needle holes in it and was well deformed), ordered a rebuild kit, put the distributor through ultrasonic cleaning, changed out the 6 metering o-rings, cleaned the barrel filter, regreased the plunger with WD40, new barrel o rings, new EHA valve orings, took great care in aligning the discs and springs, and went to install in the car. Well, that got me a no start. after finaggling with the air/fuel mixture screw, I got her to start, but she ran like dogshit. I don't have a multimeter capable of duty cycle so I'm working in the blind here. It got to the point were I thought it could idle well (economy meter pretty much pegged tot he left in park, only slightly off when in reverse/drive). Boy was I wrong. I went for a test drive, and I couldn't give it any throttle without it dying, popping/banging. It smelled of gasoline and just died, so I'm thinking it got flooded. I did a cursory google search, and somebody recommended to disconnect the leads to the EHA valve. I went ahead and did that, and wow, the car runs perfect. Even cruise control works now (inop before) What is the deal with the EHA valve? It's not leaking from visual inspection. Could it be something as simple as reversing the lead connections? I didn't care to find out....the car ran so well without it being connected. Where to go from here?
