Glow Plugs - Diesel Truck Forum -
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post #1 of 4 (permalink) Old 11-23-2007, 02:53 PM Thread Starter
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Glow Plugs

:smoke how do you know when to replace and do you have to replace all of them at the same time??:smoke
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post #2 of 4 (permalink) Old 11-25-2007, 08:30 AM
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what ive heard is just change em all out at the same time. better to make em all strong then to leave a few weak links in there.

1996 F-350 LB CC 4 in. lift 35 in. BFG AT's Go Rhino Grill Gaurd, Stancor GPR.

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post #3 of 4 (permalink) Old 11-25-2007, 10:44 AM
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You'll notice the engine getting harder & harder to start and will start seeing more & more white smoke as the plugs fail one by one. If you're going to go to the effort to take off the valve covers to replace one, it's a heck of a lot easier to replace them all and be done with it. The one thing to be very careful of is that you don't break off a plug in the head.
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post #4 of 4 (permalink) Old 11-25-2007, 04:08 PM
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If you have an IDI (6.2/6.5L, 6.9/7.3L) then it *may* be wise to replace all 8 if you find a bad one IF they have all been in there for a couple of years.

With the PSDs, I have only replaced two or three GPs since 1994, and only one was not murdered by a bad IDM harness (they will NOT tolerate 115V), it was just bad - had an open circuit. So with the PSDs, I am very much in the "fix as fail" camp.

With the IDI engines, it depends also on the brand of GPs you have. If, for example, you have a Ford/IH IDI engine, and find non-OEM GPs in it, get rid of them ALL the first time and use OEM replacements, then fix-as fail.

'93 F-250 HD, 7.3L IDI, 5spd - FARM TRUCK
I Support: Trailer brakes an every axle over the towing vehicle's GVW; CDLs for RVers; Safety inspections for ALL vehicles and 6 axle trucks (97K GVW proposal).

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