Pendragon
Active Member
- Joined
- Apr 6, 2012
- Messages
- 258
- Location
- Cardiff
- Car
- 2000 Mercedes C240 Elegance (W202) with Multipoint Romano LPG Injection System
First of all let me say Hello from cold Cardiff and thanks for having me and apologies if this has been brought up before somewhere else on the forum.
Back in January I bought my Mercedes Elegance C240 (W202) on a "W" Reg (2000). I then had a Romano multi-injection LPG system put on it. Ran fine for a few weeks and then on idle I started to get a vibration/missing and a lag when pulling off and driving away although if I hit the throttle it will fly. It has 139k on the clock and has full Mercedes service history bang up to date. I have also given it a service for peace of mind including a good engine flush. Engine is silent.
Anyway, it was very noticeable. Sometimes I could turn the engine off and restart it and she would be fine for a short while but then it would start again.So I changed the leads, plugs, coil packs and Mass Airflow Meter but still it persisted.
Now I have diagnostic equipment but none of it will read this model so I took it to another diagnostics garage that had a Launch X431 and it came back with the following codes:
P0300b....Misfire Damages TWC
P0306b....."".....Cylinder 6
P0150 93/3.....02 sensor left
P0130 ............02 sensor Right
P0205 ..Injector Valve Cylinder 5
P0204 ..Injector Valve Cylinder 4
P0305b..Misfire Damages TWC
P0304b..Misfire Damages TWC
I then replaced both 02 sensors with new ones from Euro Parts in Cardiff and it seemed to run better although the problem still evidend....just not as much.
Took it to the Autogas fitters who adjusted the LPG mix as they said it was running a little lean and it drove all day like a new car until the next morning. Not as bad now but still missing especially between 900 & 1000 revs.
Took it back for another diagnostic but for some reason their Launch would not connect with it again.
I have ordered a laptop with a Mercedes multiplexer so that I can do this myself and use on other pre 2001 C Class Mercedes.
Has anyone got any ideas on this? someone said that I need to clear the existing codes in the ECU as it will still assume there is a problem. Disconnected battery over night but still the same.
Sorry for the long winded post but better to tell everything at once than bit by bit.
Grateful for any help from those who know.
Keith
Back in January I bought my Mercedes Elegance C240 (W202) on a "W" Reg (2000). I then had a Romano multi-injection LPG system put on it. Ran fine for a few weeks and then on idle I started to get a vibration/missing and a lag when pulling off and driving away although if I hit the throttle it will fly. It has 139k on the clock and has full Mercedes service history bang up to date. I have also given it a service for peace of mind including a good engine flush. Engine is silent.
Anyway, it was very noticeable. Sometimes I could turn the engine off and restart it and she would be fine for a short while but then it would start again.So I changed the leads, plugs, coil packs and Mass Airflow Meter but still it persisted.
Now I have diagnostic equipment but none of it will read this model so I took it to another diagnostics garage that had a Launch X431 and it came back with the following codes:
P0300b....Misfire Damages TWC
P0306b....."".....Cylinder 6
P0150 93/3.....02 sensor left
P0130 ............02 sensor Right
P0205 ..Injector Valve Cylinder 5
P0204 ..Injector Valve Cylinder 4
P0305b..Misfire Damages TWC
P0304b..Misfire Damages TWC
I then replaced both 02 sensors with new ones from Euro Parts in Cardiff and it seemed to run better although the problem still evidend....just not as much.
Took it to the Autogas fitters who adjusted the LPG mix as they said it was running a little lean and it drove all day like a new car until the next morning. Not as bad now but still missing especially between 900 & 1000 revs.
Took it back for another diagnostic but for some reason their Launch would not connect with it again.
I have ordered a laptop with a Mercedes multiplexer so that I can do this myself and use on other pre 2001 C Class Mercedes.
Has anyone got any ideas on this? someone said that I need to clear the existing codes in the ECU as it will still assume there is a problem. Disconnected battery over night but still the same.
Sorry for the long winded post but better to tell everything at once than bit by bit.
Grateful for any help from those who know.
Keith
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