hey guys, i have a W124 E220 '94 , i'm experiencing cold start issues when the engine is cold (first couple of starts at the morning,or fist start in a certain day), it would start at first crank but thats not the problem, the idle is very low and tends to make the engine stall, first second it will go near 1000 RPM and then goes down to 500 and will start to vibrate and stumble and then stall, if i throttle it up to 1500RPM it will raise above that slowly, if i leave the throttle while the engine is still cold, it would go to the lowest RPM and stall.
Here's a cold start video: MOV_0032 (download the file and watch it)
Note: when RPM is steady / above 1000RPM i was throttling.
What i've done:
1.Fuel pump + Fuel injections were replaced, OEM of course.
2.Fuel pump relay (OEM) changed (helped the rough idle a very little bit).
3.Plugs also changed, didn't found Bosch F8DC4, so i went for NGK and Beru.
4.Cleaned throttle body, and MAF sensor.
5.OVP replaced with another one from my Mech.
Things i am concerned about:
1.Is the M111 suffer from brittle wiring insulation, and biodgrable wiring harness, also about the throtle body, the build date is not visible (the stamp is torned) its mostly before 1998.
2.Vacuum leaks, and 20 years old plastic, this may cause vacuum leak, how can i properly check if there's vacuum leaks (smoke test ?)
3. i haven't changed coil packs, and i think that PO didn't do it too ( he has neglected the car, and has made some bad mistakes you don't want to know what he has done (interior not mechanical)).
4. any other things i need to check before i change the damn wiring harness or throttle body ?
Here's a cold start video: MOV_0032 (download the file and watch it)
Note: when RPM is steady / above 1000RPM i was throttling.
What i've done:
1.Fuel pump + Fuel injections were replaced, OEM of course.
2.Fuel pump relay (OEM) changed (helped the rough idle a very little bit).
3.Plugs also changed, didn't found Bosch F8DC4, so i went for NGK and Beru.
4.Cleaned throttle body, and MAF sensor.
5.OVP replaced with another one from my Mech.
Things i am concerned about:
1.Is the M111 suffer from brittle wiring insulation, and biodgrable wiring harness, also about the throtle body, the build date is not visible (the stamp is torned) its mostly before 1998.
2.Vacuum leaks, and 20 years old plastic, this may cause vacuum leak, how can i properly check if there's vacuum leaks (smoke test ?)
3. i haven't changed coil packs, and i think that PO didn't do it too ( he has neglected the car, and has made some bad mistakes you don't want to know what he has done (interior not mechanical)).
4. any other things i need to check before i change the damn wiring harness or throttle body ?