Re: Need help with a 1997 Ford Club Wagon Speedometer Problem
I'd get the vehicle scanned for codes, even if the engine light isn't on. Stored codes will stay in the PCM for up to 50 restarts. Do you have an oil pressure gauge? The oil pressure dropping while driving could mean a bad sending unit. The speedo could be a bad rear wheel speed sensor, generally, a brake light or parking brake light will accompany this, although not always. You can get the engine temp sensor checked out as well. As it works intermittently, I'd check that the proper fuse is installed that operates those sensors. It's common to find a higher amp fuse in place where a lower amp fuse should be. This is common owner neglect that can bite oneself down the road, generally onto the next owner: circuit keeps overloading, so instead of finding the problem, they install a higher amp fuse. This is also a fire hazard so you'll have to verify the fuse with your owners manual (it may also be listed inside the fuse panel lid).
Hopefully someone else will chime in and offer a solution or better suggestions....
'11 Ram Quad Cab 4x4 SXT 5.7L HEMI (stock); 48,500m
'06 Pontiac G6 GT 3.5L 220hp; 64,000m
'12 Chrysler 200 Limited 3.6L 283hp; 28,000m
'99 Taurus 3.0L 2V Vulcan 145hp; 154,300m - Traded
Amsoil in all vehicles!