'98 S70 Won't stay running. - Volvo Forums - Volvo Enthusiasts Forum


Volvo S70 Made from 1998 to 2000, this sporty model replaced the 850 sedan and instantly became a hit.

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Old 10-09-2018, 04:36 PM
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Default '98 S70 Won't stay running.

I have a 98 S70 that won't stay running. I got it with a blown head gasket. I replaced that and it ran great for about three months. Now it will start and run until it reaches normal operating temperature, then it chugs like it's not getting gas and dies it will not restart for several hours after that. There is no odd colored exhaust until it chugs, then the exhaust is white. I an not a mechanic, so the head gasket being bad is a possibility, but any ideas? Thanks in advance.
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Old 10-09-2018, 07:30 PM
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Test the engine coolant temp sensor.
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Old 10-10-2018, 08:35 AM
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I agree, do a search and look up testing and or replacing the engine coolant temperature sensor. It is not hard at all and not very expensive either. FYI, white smoke is usually a sign of unburned fuel.
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Old 10-10-2018, 07:14 PM
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There is a "stay running" module inside the muffler. Sometimes that condensation from the exhaust will cause it to fail.

Order a replacement at 1-800-Stay-Running
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Old 10-12-2018, 12:30 AM
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A new coolant temp sensor is on the way. Hopefully that fixes it.
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Old 10-12-2018, 08:38 AM
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Keep us posted
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Old 10-14-2018, 06:32 PM
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Ok, so the temp sensor I got from Amazon was the wrong one. I tried to check some stuff anyway. I started the car and let it come up to operating temp. It sputtered again, but it stayed running. I was driving when it died before, so it was under throttle. This time, when the thermostat opened, and the engine cooled a bit, it started running rough, but once the temp came back up, it ran ok. I drove it around for a few minutes and it did fine. So there is a problem, but not the one I thought what could cause that?
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Old 10-14-2018, 11:48 PM
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sounds like water leak into head, maybe cracked head
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Old 10-15-2018, 08:46 AM
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Im still betting on it being a coolant temperature sensor. If it was a cracked head there would be evidence of oil in the coolant and white smoke out of the tailpipe.
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