Our van has been progressively getting worse at starting up in the morning. It only has issues when the engine is cold.
Initially I thought it might be the glow plugs. I tested their resistance and they are all at about 1 ohm. I have also voltage tested them and found similar value to battery reading ie. about 12.5v. So I then thought to check wiring and relay by putting my meter between the glow plug and the glow plug cap. Here I get a 11v reading... Shouldn't this be 12v? Is there anything else I can try to troubleshoot the problem?
My van is a Renault Master 2003, got 80k miles and no service history so don't know what jobs have been done...
Any help is truly appreciated.