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Matt
Matt, Mechanical Engineer
Category: Car
Satisfied Customers: 21989
Experience:  BEng hons Mech engineering, in auto industry 22 years
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Iv got a ML(###) ###-#### *****'s not very good at starting on

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Hi. Iv got a ML(###) ###-#### ***** not very good at starting on cold mornings the garage checked the heater plugs and said they where ok. I'm thinking they maybe just didn't want the job of replacing?? It's done 52000. Also the tailgate doesn't work with the remote or the button inside it just unlocks. Any ideas??
Submitted: 1 year ago.
Category: Car
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Expert:  Matt replied 1 year ago.
Hello I'd check that you're getting full power to the glow-plugs, they pull a lot of current so take care when checking but see if the relay is clicking when the ignition is turned on first and also check the fuse if this is OK check to see if the engine earth strap is also OK. If the EGR valve is stuck open then this too can effect starting so try disconnecting it to see if this helps or changes anythinglicking when the ignition is turned on first and also check the fuse if this is OK check to see if the engine earth strap is also OK. could also be incorrect fuelling due to a faulty water temp sensor. If this is the problem then the ECU will not control the fuelling correctly as the engine warms - so unplug the sensor and clean the contacts on both sides with some switch / electrical cleaner (not WD40) and inspect the wiring for any signs of damage to the insulation especially where it runs over other components and through the bulkhead- if this doesn't help consider replacing the sensor as they're not expensive Lastly it’s also worth considering fitting a new fuel filter as if only slightly blocked this can lower fuel supply pressure and choke the main pump, the pump will be more sensitive to this when its cold as diesel thickens considerably with low temperatures.
Matt, Mechanical Engineer
Category: Car
Satisfied Customers: 21989
Experience: BEng hons Mech engineering, in auto industry 22 years
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