Join Date: Nov 2010
Location: Yuba City, ca
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.60 output on #3 wire is not the one being measured, but it is the idle voltage. It should actually be about .5v, under .529, unless you have a Timbo, and if so that may be he problem.
Low voltage to sensor is the input and should be 5 volts on a different wire. Occasionally the problem is a bad APPS. More often it is dirty corroded, even mildly, battery terminals(often driver neg) or cables. Clean all terminals for perfect metal to metal connection and check cables for corrosion.
Do you have a Timbo apps, the one with a pigtail hanging down 2"?
They are especially an issue on 98.5 and 99 trucks casueing the truck ECM to think it is accelerating when it is not, surging at idle and other wise sometimes.
Also does the tach always look like it is accurate, not bouncy or low? If either you have a bad Crankshaft sensor.
The truck starts and runs for about 5 seconds from a computerized Crank signal for timing, the the sensor takes over. Does not sound like your problem, but.
It could be an ECM problem. What does the wait to start light do when you turn the key to ON? Does it always come on for at least a second?
99 2500, Quad cab, 4x4 47RE, BD pressure lock on it, small BD 90/140 chip on the VP 44 connection plug, 17" 3rd gen wheels. 3.55 diffs. Ruenell front bumper and warn winch, Rancho adj shocks. 663k miles.