Lunges forward when upshifting - Ranger-Forums - The Ultimate Ford Ranger Resource


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Old 06-19-2015
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Lunges forward when upshifting

I drive a 2003 Ford Ranger 5 speed manual, when I am up shifting(around 2500 rpm) i push in the clutch and the rpms dont drop if anything it rises about 200rpms and when i put it in gear and let out the clutch it lunges forward, im guessing its lunging because the rpms arent dropping like they are supposed to be, need help knowing why they arent dropping though?
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Old 06-19-2015
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RPMs should stay the same for 5 seconds when shifting, up or down, it saves fuel and lowers emissions.

But they should not increase.

I would check throttle linkage with engine off, remove cables, cruise and gas pedal cable.
Push gas pedal cable in and out and make sure it is not binding.
Open throttle and feel if it has a rough spot, let it snap closed a few times.

Put gas pedal cable on but leave cruise cable off, drive it around and see if it does the increased RPMs when shifting.

Is the AC or defrost on when this happens, computer raises idle when compressor is on but that should not effect anything above 1,500rpms.

What is your warmed up idle RPMs, should be 650 with manual trans and 750 with automatic, AC/defrost OFF, add 50-100 if AC is on, in neutral/park

There were some Ranger recalls for similar issues, computer had to get a software update, call or go by a local Ford Dealer with the VIN and see if they will give you a print out of the TSBs and recalls for your truck.
I think these are available on-line as well, but don't have that link.
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Old 06-19-2015
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Well when im upshifting and i push in the clutch the rpms drop to somewhere around 1500, AC is not on when this happens, yeah i would say the warmup idle is about 660 maybe a little higher, but when i first got the truck it never did anything like this which was only about a month ago, and this problem for me doesnt happen as soon as i get it out of my driveway, its usually about 20 miles before it starts and sometimes never does it at all, ill get the vin and look it up to see if i can find nything and if not ill go to my ford dealer and see what they say, thank you for the reply, and i will look at the throtille, i also heard it could the ESG but ive never dealt with an ESG so
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Old 06-20-2015
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Engine computers run in Open Loop(factory pre-set operation) until engine reaches operating temp, coolant temp at approx. 195degF, so in 5 minutes or so of driving.
After warmed up computer switches to Closed Loop, it now uses all the sensors like the O2s, to set air/fuel mix for best MPG.

When you are moving and push the clutch in the RPMs should drop but will stay above 1,000rpms, that is normal, 1,500 seems a bit high but...........I don't have an '03.
When speedometer drops below 5MPH(approx.) the high idle should now drop to the 650 warm idle.
This is an MPG and emissions thing, and was added when Rangers got the new EEC-V computers in 1995, it seems to change parameters for each model year, i.e. 'they' fine tune the best RPMs and MPH cutoff in the software, and they do goof, lol, which is why you might need a software update.

And just as a tip, unrelated, lol, when going down hill leave truck in gear with foot off the gas pedal, if engine RPMs are above 1,200(approx.) the computer will shut off the fuel injectors, this of course saves on gas, and one of the benefits of fuel injection.
With a carb engine you would want to coast with clutch in or be in neutral so high engine vacuum wouldn't suck in extra fuel when going downhill, i.e. using the engine to brake downhill speed.
With fuel injection the opposite is true, using engine to brake saves fuel.

Last edited by RonD; 06-20-2015 at 10:02 AM.
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