Serving Our Country!
Join Date: Aug 2007
Location: Manor, TX
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The missing while coasting downhill is normal. The injectors aren't firing.
The WTS light doesn't really indicate anything, the glow plugs can continue to run even after it goes out. To test the glow plugs, start by checking voltage at the realy. If it's working then start ohming the glow plugs out.
What color is the smoke when you start the truck and what it the ambient temp?
Does the speedometer jump around any? The transmission and RABS both use the VSS signal from the rear axle. If the speedometer is smooth, hook up a scanner and see if it reads speed below 12 MPH. If it's reading then the signal from the speedometer is fine but the gauge is bad. If it's jumping around or the scanner doesn't get a signal then replace your VSS. If the VSS doesn't do it then it could be the tone ring, wire, RABS unit or PSOM.
Fix the speedometer before the transmission as the trans requires speed signal to shift correctly. It could also be TC lockup, tuning or valve body.
For a scan tool, look into Auto Enginuity.
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