I have an A4 2.5TDI (AFB ??) and it has problems starting when it's cold. the glow light comes on, goes off and when I turn the key it takes a good 10 sec for it to start. With a cloud of off-white smoke (loads) coming out. Problems don't appear after this first start. Also performance and economy seem to be a bit worse.
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glow plugs are activated if look on the dash when you turn the ignition just before cranking and you should see a light that stays on for several seconds then goes out and then you should crank the engine ! sometimes when its really cold or the glow plugs are worn try turning the ignition on and off each time light goes out 2 or 3 times to get more heat on the plugs then start ! if this doesnt work then glow plus and system needs checking !
i think glow plug replacement needed. ever used starting fluid in cold to start?try this, next time no start, cycle your key and let the light come on, wait till it goes off, turn key again until light goes off, if you have to do this more than 3 times, and it runs fine, replace the glow plugs only then. thank you for choosing fixya.com!
Even though the glow plug goes out it does not mean the all the glow plugs are working,
Remove glow plugs.
With a set of jump leads connected to a battery connect the earth lead to the body of the glow plug and touch the top of the glow plug where the wire is connected with the pos lead the top of the glow plug should heat up and turn red.
Your glow plug controller is out, or there is an interruption in its power source, etc. Diesels are coldblooded by nature, and most need glow plugs to heat them up before starting in cold weather. The controller supplies the power to the glow plugs, but if it goes bad, or its supply of power isn't there, it won't start in cold weather, and that wait to start light which is also controlled by it won't come on.
The problem is the glow plugs are bad or not coming on. Even though the "wait to start" light comes on, the glow plugs may not come on. I have found when this happens, the light comes on for only 1-2 seconds and goes off. With the engine cold, the light should stay on for about 5 to 7 seconds. The colder the engine, the longer the plugs should stay on. There is one glow plug for each cyl. The plugs are in the "V" of the engine and screwed into head. Only one wire goes to the glow plug and the wire runs from one plug to the next on each bank. You test them by removing them and grounding the body and putting 12v positive to the terminal. The tip should glow red hot like a cigarette lighter. There is a glow plug relay behind the air intake horn which also could be the problem and there is a engine temp sensor in the circuit also.
The glow plug coming on on the Diesel Mondeo is an engine management fault indicator. The car goes into "limp mode" when this happens or in other words safety mode is triggered. This explains your loss of power.
To find the cause of this light coming on - the car will have to go on an OBD scanner at a service shop which will read the codes stored in the cars computer and give you an answer as to what is causing the fault to show.
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Hi Robert From the brief description of your problem I'm guessing your vehicle is a Diesel? as the light you refer to sounds like the Glow Plug warning. When you turn on the ignition from cold the light comes on for around 5 to 10 seconds and then you start engine Yes? If the light is coming on after vehicle is warmed up the glow plugs will upset the combustion and ruin your performance, so I would be looking at glow plug timer fault. Hope this FixYa's problem! Paul 'W' U.K.