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Drivetrain Tech General discussion of drivetrain for the Ford Ranger.

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Old 01-12-2014
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I am: Jimmy Duke
Join Date: Nov 2013
Location: Birmingham, AL
Vehicle: 2000 Ford Ranger
Drive Type: 4x2
Engine: 3.0
Posts: 6
Total Props: 0
Engine surging

On my wife's 99 B2500, the engine is revving up to 3-4000 when the clutch is engaged and/or shifted into neutral. Not all the time, but getting worse.

Most of time will rev up to 3000, then go back down to idle, but as I said, getting worse and taking longer to get back down to idle.

Any idea what would be causing this?
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Old 01-13-2014
iTrader: (1)
I am: Ron Dean
Join Date: Jan 2014
Location: Vancouver, BC
Vehicle: 1994 Ford Ranger
Drive Type: 4x4
Engine: 4.0
Posts: 4,727
Total Props: 88
The computer is programmed to hold RPMs high when shifting, but only for a few seconds.
Try tapping the gas pedal and see if RPMs drop, if so lube the cable ends and the throttle plate, could be sticking.

Computer also will hold idle at 1,000rpm until speedometer drops below 5mph

Does the engine idle normally?
750rpm when warm
1,000rpm when cold

The TPS(throttle position sensor) is a long shot but might be worth testing, volt or OHM meter, or a live OBD II reader can show if it's voltage is changing when clutch is in.

IAC valve is another long shot but these can be cleaned.
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