Hi I have a 92 GMC Sierra 4.3 V6 about 127K miles. I bought it a little over two years ago from the original owner with about 92K. The truck was pampered and came with a thick stack of receipts for repairs and maint done over the years. I have had absolutely ZERO problems of any kind
--until now. The cooling system went from nice green coolant to rust almost overnight. This morning I topped it off and let it run for a few minutes. Looked in the overflow tank and saw bubbles. I know that usually means head gasket, but can intake manifold gaskets also cause that? I know some GM engines had bad problems with them. Is this engine one of them? It also recently started getting a "check engine" light intermittantly, and the almost unbelievably great gas mileage-- about
20-- dropped to about 16. There does not seem to be any water in the oil. I am not driving the truck anymore until I can get it to a friend's shop, and get it fixed, but I'm just curious, and a little worried. I love the truck and am going to keep it regardless of what it takes to fix it-- just wanted some idea what to budget for. As to a previous thread about 20 year old vehicles-- here's a 19 y/o, and this weekend I'm going on a 500 mile round trip in my 86 C10 6.2 Diesel-- since the problem with the other truck. (high school reunion -- shudder -- 40 yrs) . FWIW, I don't see that many new style Tundra's here, and "here" is San Antonio, where they are made. Don't know anybody who has one, other than a friend who had a rental while the ins. co. was settling on his totaled 03? F150. He said he didn't care for it that much and would never buy one. Any and all info/advice on the 92 V6 will be greatly appreciated. Thanks Larry