Cold start issues

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Markssl

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Jul 23, 2014
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493
When starting in the morning the glow plug light goes off as normal but it takes an age, maybe 3/4 full key cycles to start if it's very cold outside. Once the car has warmed up a bit it will start as normal all day long.I put a diagnostic reader on it tonight and got 10 errors including one pointing to the glow plug module. The others were to do with O2 sensor etc. See pic. I can buy a new unit for about £100.
Would anyone think this is the way to go?
It had new glow plugs a while back and as the light extinguish's as normal I don't think they are the problem.
Thanks
41fb504de52b1fd7af8596d4ead10d3b.jpg



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When starting in the morning the glow plug light goes off as normal but it takes an age, maybe 3/4 full key cycles to start if it's very cold outside. Once the car has warmed up a bit it will start as normal all day long.I put a diagnostic reader on it tonight and got 10 errors including one pointing to the glow plug module. The others were to do with O2 sensor etc. See pic. I can buy a new unit for about £100.
Would anyone think this is the way to go?
It had new glow plugs a while back and as the light extinguish's as normal I don't think they are the problem.
Thanks
41fb504de52b1fd7af8596d4ead10d3b.jpg



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P0670 is the glow plug module fault code


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where are you based?? does the glow plug light come on whilst your driving???
 
Stourbridge, West Mids. No the light goes out as normal. Before I had the glow plugs changed the light was staying on. This is why I think it's the relay.


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Has anyone changed this part to improve cold starting?


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Yes , replaced mine a month or so ago.

Car starts as it should now.

Genuine MB part was £120 from my local indy and took 30 mins to fit.

Kenny
 
Cheers Kenny I shall get one.


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I had the same on my E320. Make sure you get a genuine MB relay unit. Mercland sorted mine and when it went back on star, the o2 sensor that was previously showing had disappeared!
 
Is this ok do you think?
dfa543b204a5202918352930b48405f9.png



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The genuine MB one was only £120 , I don't know about the quality of the one in your pic but for an extra £20 I would buy the Mercedes one.

I does look the same as the updated mercedes one.

Kenny
 
Ok I'll call MB tomorrow. Which MB dealership did you buy from?


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I bought mine from my local indy - Merparts in Port Glasgow.

Kenny
 
Ok thanks. I'm just thinking my local dealership may charge a lot more having bought parts from them before.


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I bought mine from my local indy - Merparts in Port Glasgow.

Kenny



Just checked with my local Merc dealer and they quoted me £195.60.



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