BAD COLD START NEW GLOW PLUGS STILL BAD START GLOW PLUG LIGHT STAYS ON

check you have power at the glow plugs . fit test light clamp to ground and probe the glow plug rail if no power check fuse if fuse is good check relay if relay is good take vehicle to your mosy trusted garage

glow plugs dont last for ever
have them visually inspected

they need to heat up to spec or motor wont start

what motor or vehicle ?

You need to check all small o-rings in all fuel pipes

sounds as though the cylinder,s etc are a bit clogged up, try some diesel fuel addative,as with all diesel engines if they do not get long and regular journeys the glow plugs,injectors etc get clogged ,as the engine does not get hot enough to burn these deposits off on short stop start types of journey's . you are possibly looking at replacing the glow plugs but give the addative a try and if possible take for a long drive 2-3 hours at steady highish speed , ok to repeat the addative and long drive once more ,if no improvement will need to go into the repair shop to have the glow plugs seen to at the very least , good luck

year model? Engine size? I need a little more information than ford won't start when cold. I would guess either the glow plug relay or the actual glow plugs themselves are bad, but usually the glow plug relay, because if it were just one or two glow plugs it would start, but run like ****.

Test for power with test light at glow plug ,If you have power ,Replace glow plugs...If no power check cold start solenoid or glow plug timer switch... More info at parts store, library ,or come back here let us know what you find .the more you can tell us the better we can help you ,hope this help let us know....Thank You..

Hello philkatkiele: My name is Roger and I will help you. First thing you need to check is the glow plugs. They will need tested individually. Un plug all 8 glow plugs. Take a test light and hook end to the positive battery cable. Touch opposite end of test light to the terminal end of the glow plug. The test light should light. Touch all 8 glow plugs. Ant that do not light are bad and will need replaced. If glow plugs are burnt out then the controller will flash wait light to early or very fast. The wait light should be on for approximately 10 seconds.If al glow plugs check ok then I would suspect the glow plug controller as the problem. Also if the temperature out side is below 40 degrees the truck should be plugged in. This will help to make the engine start easier. Should you need further help please just ask.Please rate the answer as this way I know it was helpful. Thank You for using Fix Ya. Roger

There is a 5th injector called the cold start injector, that is electrically controlled off the starter. You can easily unscrew it while still attached to hoses and wires, and watch it squirt. You can also verify it is getting voltage with a test light or meter. There is also a thermal timer for it that could be bad and preventing current from the starter.

this is a common problem for these cars glow plugs go bad like spark plugs however the smoke would lead to bad mass airflow meter. it is not telling ecu corrcet miss. disconnect mass airflow meter. when cold see if this makes it start better. it should would means you need new m.a.f. glow plug issue take a test light place clamp on positive of battery then pull off glow plug connectors place tip of test light on glow plug the bad one will have a dull light unlike the good one which will be brighter. will need new plugs and wire harness four **** connectors and wire striper and crimper will fix concern good luck

have you tried the glow plug relay? or if you have a test light see if theres power to glow plugs when light is on,should only light for 5 or so seconds.some of the newer hdi dont even use the glow plugs till temp is very cold,i have a 2006 2.0 hdi van and glow plug light only stays on for a second or so,and its been like that from new! is the problem just bad starting? and is it only when its cold? if you have a manual priming pump for fuel under bonnet,trying pumping before starting it could be fuel prob?ie air getting into fuel system