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  1. #1

    Default 1997 silverado starting and coolant problems

    I have a 97 silverado z-71 5.7l v8 ext cab 4x4, I am have trouble starting my check engine light came on at the end of this past week so I scanned it with my obd scanner and I figured out I needed a new M.A.P sensor. I replaced that along with a new distributor cab and rotor thinking either of those would fix the problem, it still takes a while to get it started. The weather is getting colder, my battery should be bad as it is pretty new I checked the spark plugs and they did look bad either. When the engine is cold, if I take of my truck bogs down also. Along with my starting problem I have a coolant leak somewhere under the alternator. I think it might be the freeze plug but I'm not certain. Any ideas? I'm pretty new to this so hopefully I explained everything good enough
    1997 Silverado 4x4

  2. #2

    Default Could be

    The leak benath your alternator sounds like what I had on my 97 Sierra with a 5.7 and it turned out to be the water pump gasket. I went ahead and replaced the water pump since the old one had to come out anyway.

    As for the other issue--not sure about that! If it was giving you grief while hot, I would suspect your CTS/coolant temp sensor as these tend to give trouble and make the engine run rich as it thinks it is cold.

    Good luck!!
    1997 GMC Sierra
    2005 Cadillac DHS
    2004 Toyota Camry
    1996 Toyota Avalon

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