d215yq
Senior Member
- Joined
- Mar 28, 2008
- Messages
- 2,664
- Reaction score
- 702
- Age
- 39
- Location
- Valencia, Spain
- Your Mercedes
- 1987 W124 300D 280k miles
Have been having a rough cold start from my car ever since the temperatures have got lower than 10 degrees. Although the glowplug light never lights (i assume bulb broken), if i wait 15 seconds for the glowplug cycle to work, and press the accelerator a bit the car starts perfectly. However now the temperature is near zero, releasing the accelerator after 5 seconds will see it stall, it needs about 10-15 seconds at 1500rpm before release to idle.
So I am thinking it isn't a glowplug issue but is a cold start idle issue. I've already played withthe relays behind the battery and switch cleanered them/changed all fuses in fusebox. One thing I notice is that when the ignition is on and I am waiting for the glowplugs, the rev counter acts like a temperature gauage! (6k rpm is when it is near zero, 4k when it is about 5 degrees, 2k when it is 10 degrees, above 10 degrees rev counter is on zero). There is also a clicking from the relays behind battery while car is cold. Once the car starts the rev counter works as normal (although soemtimes mid journey it works intermittently). So does this suggest that somehow the rev counter is shorting out/interfering with the feed to not allow the relay to do its job of making the car put more fuel in when cold?
If so is there a particular wire or relay or circuit that needs further investigation?
So I am thinking it isn't a glowplug issue but is a cold start idle issue. I've already played withthe relays behind the battery and switch cleanered them/changed all fuses in fusebox. One thing I notice is that when the ignition is on and I am waiting for the glowplugs, the rev counter acts like a temperature gauage! (6k rpm is when it is near zero, 4k when it is about 5 degrees, 2k when it is 10 degrees, above 10 degrees rev counter is on zero). There is also a clicking from the relays behind battery while car is cold. Once the car starts the rev counter works as normal (although soemtimes mid journey it works intermittently). So does this suggest that somehow the rev counter is shorting out/interfering with the feed to not allow the relay to do its job of making the car put more fuel in when cold?
If so is there a particular wire or relay or circuit that needs further investigation?