RPM Spike on 91 SC | Ford Thunderbird forum club group 1955-2005 models

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RPM Spike on 91 SC

  • Thread starter Thread starter Cleve
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Cleve

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Hey everyone. I've got a strange problem that I've been racking my brain over, and I'm stumped. I have a 91 Thunderbird SC 4 spd automatic with a 3.8L V6. Car is in great shape and runs very smoothly, but I get a spike in the RPM at around 1500 RPM. It does this in all gears, including neutral and park, so I don't think it's a tranny issue. Burped the coolant thinking it might be getting some funny readings when an air bubble passed over a sensor, but it's still doing it. Any suggestions?

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