Cold start issues

[Markssl]

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

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[Markssl]

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

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P0670 is the glow plug module fault code


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[paul73mt]

where are you based?? does the glow plug light come on whilst your driving???

 

[Markssl]

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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[Markssl]

Has anyone changed this part to improve cold starting?


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[KennyN]

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

 

[Markssl]

Cheers Kenny I shall get one.


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[M11GUL]

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!

 

[Markssl]

Is this ok do you think?

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[KennyN]

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

 

[Markssl]

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


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[KennyN]

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

Kenny

 

[Markssl]

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


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[Markssl]

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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