Install Tips: Spray a good rust penetrant on plugs where they screw in and at the wire spade connectors at least 24 hours in advance. Install Tips GMC 1998 Suburban: You will have to take off the inner fender well on passenger side (15 mins) to get at plug closest to the fire wall, first 3 reachable by just taking off rubber shroud, 2nd from firewall will also need to have heat shield (bolted onto the manifold removed - spay night before as well and use impact wrench). The plug closest to firewall on Drivers side best reachable from under the vehicle. Be prepared for some of the spade connectors to be a problem, two of them I end up breaking tip off of old glow plug and then remove the from plug wire spade connector.

the upper stems (for the electrical connection) are very delicate and snap off before reaching minimum torque spec -you must choose between likely breaking the stems off during installation due to "excessive torquing" or letting the nut vibrate loose after five minutes of driving. the heating element burns out after 1000 miles MAX. I will DEFINITELY spring for better glow plugs next time.