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Old 10-15-2011, 10:35 AM
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Default HELP!!! Coolant Leak On Back Of Motor On 97 5.7L

I have a coolant leak on my 1997 GMC Savana 5.7L on the back of the engine. It seems to leak only a couple hours after sitting, say overnight. It hesitates when I hit the gas after it sits. It also has a bit of a popping sound in the exhaust. I got a Check Engine Light that the trouble codes were PO171 and PO174.

I changed the thermostat thinking that is what leaked, but it wasn’t. I replaced the fuel filter and it still hesitates. Is it the lower intake manifold and would that leak coolant?? Also has anyone changed the intake gasket themselves??

I have done a video showing everything in detail: 97 GMC Savana Coolant Leak on 5.7L - YouTube

If you have any questions or need clarification, do not hesitate to ask.

Thank you for any help.
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Old 10-15-2011, 02:48 PM
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Those codes are O2 sensor upstream, both sides. Is there any white smoke? Also I cannot tell from the video if it is the intake or head gaskets. Zoom in better so I can see. The head gasket would cause an O2 sensor to give false readings, and both sides leaking if it is a head gasket would explain that. Has the engine ever overheated? What has changed?
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