Change out glow plugs
Hello, Its just like changing sparkplugs. First, you should check the timer for proper operation before blaming the glowplugs. The timer is the part where the wires on the glowplugs come from. Its' the Timers job to heat up the glowplugs and there is a Relay which activates the timer.
Once the Timer gets power from the Relay, it sends spark to the glowplugs and measures the amount of juice flowing through the glowplugs. When a predetermined limit is achieved, the Timer shuts down and sets a light on the dashboard that you can start the engine.
If you have a bad glowplug, that cylinder will not fire cold and the engine will miss, run rough , and spew black smoke out the tailpipe. A complete changeout of the glowplugs will solve the problem, but individual glowplugs can be tested and changed independently at a lower cost.
To test a glowplug, you can use jumper cables and apply voltage to the glowplug in limited amounts or you will melt the glowplug. Best to place the negative on the base and avoid the threads. Then touch the top of the glowplug and watch to see how quick it turns bright. Its a matter of comparison, and the darker the glowplug stays, the worse it is.
There is no adjustment on the glowplug, just swap them out and you will be fine. I hope my solution is very helpful to you. You can check the Timer with a voltmeter by removing a glowplug wire and hooking the hot lead from your meter and grounding the other wire on your engine. When you turn the key to the warmup position, the meter should briefly show power.
May 02, 2011 |
1984 Ford F 250