relay for glowplugs is at the front passenger side located just behind battery just about level with top ov battery
The timer relay for glow plugs on a 86 Jetta is under the steering column. It is located in slot ten.
the glow plugs are located under the valvecovers should be 8 of them
Your glow plugs are not heating up. You may have bad glow plugs or relay. try turning on the key ( this should start the warming of the plugs and a light on the dash will come on letting you know it is ok to start if not the relay is bad) if no luck turn off the key and let it cycle again. if it is still difficult to start you may need new glow plugs.
I note the relay (part No NCL100040) is called an "ignition and glow plug heater relay". The 75 will usually start if you turn the key before the glow plugs have heated, therefore the glow plugs are probably only needed for cold starts. Glow plugs are not needed when a diesel engine is hot. The "ignition" reference may mean that some other circuit is controlled by this relay (obviously there is no conventional ignition as it is a diesel). FYI The part is also used on the Range Rover TD6 post 2002 An internet search suggest the cam sensor can cause starting problems and fault codes similar to a faulty glow plug relay.
against the bulkhead, next to the ecu
Could be bad glow plugs.
AnswerPerhaps when the glow control relay went bad, the contacts stuck closed causing the glow plugs to burn out. It happened to me, I had to replace all the glow plugs. It now starts every time. The glow plug relay could be bad, poor contacts on the fuse or plug contacts to the relay. Obvious reason is a week battery.
glow plugs, glow plug relay, poor compression on engine are some things that will give problems
Under the bonnet, looking at the engine the Relay for the glow plugs is at the far right hand side corner of the engine bay. You have to pull up the rubber insulator at the rear of the bay to take off the plastic cover housing (about 3 clips) where you will find the relay. Check the fuses as well.
Maybe, If the glowplugs stay on they can be damaged or destroyed. When you get into the unit the start sequence is: Controller tells the glow plug relay to send power to the glow plugs. The length of time is set by an engine temperature sensor. If the relay is stuck then the glow plugs will stay on during engine operation. This will kill them pretty quickly. I'd bet on the relay being stuck (welded closed) A bad system controller Or leaking injectors, on some engines leaky onjectors can cause glow plug failure. You don't state make and model so one cannot be sure about the last comment.
You don't. It uses an intake grid heater. You don't have glow plugs.
Sounds like you need to change the glow plugs or the glow plug relay switch or both.