Question about 2003 Ford F250 Super Duty Crew Cab

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Shifting When I'm pulling a load, there is a point at times that the engine sounds like it is missing. This happens between 2000 and 2250 rpm's and around 35 or 40 mph when it is attempting to upshift. It does not do it all the time and when it does do it, I'm pulling a load and usually going up hill. I had it to the shop and they have no idea what is wrong. The first idea they had was that the turbo was not being recognized by the computer. Any ideas?

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  • 183 Answers

Are you taking it out of overdrive when towing?

Posted on Sep 14, 2008

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18 wheelers what rpms do I start shifting from 1st to 2nd when hauling 80,000 lbs with a Detroit engine and 13 speed tranmission


1st 1000 rpm
2nd 1300 rpm
3rd 1400 rpm
4th 1500
5th 1600
6th 1700
7th 1700
8th 1700
etc

Oct 14, 2015 | Cars & Trucks

1 Answer

Hi-Speed Miss under load on Park Avenues - Both Ultra and Non-supercharged


Dear sir/madam,

I think he crank sensor is defective, or installed wrong. The cam sensor controls fuel injector timing and can cause sputtering and hesitation. The timing must be correct for the injector to fire when the intake valve is opening. Check for any scratch marks on the cam sensor. In addition, check the cam interrupter magnet and be sure it in place and not damaged.

The ECM sends a 5-volt reference signal to the CTS sensor. As temperature changes in the coolant, the electrical resistance of the CTS sensor also changes. The best way to test this sensor is with a scanner. When the engine is cold, engine coolant temperature should measure near the same as the ambient temp. Another way to test the CTS sensor is to measure voltage from the time the engine is started, until it warms up. Record the voltage changes as the engine warms up to operating temp. i.e. 120, 140, 160 & 180. You should see close to the full range of voltage (5.0-1.0V) during this test. If it does not change from what you first measured cold, replace the sensor!


thanks
good luck


"Don't forget to rate the solution"

Jul 27, 2008 | 1999 Buick Park Avenue

1 Answer

My tach floats while under load 2003 grand prix what would cause this?


sounds like a tcc issue in the transmission. some times it can be fixed with an ecm flash. often it is a bad tcc solenoid inside the trans. valve body.

May 07, 2014 | 2003 Pontiac Grand Prix

1 Answer

Engine cut out


Sounds like you may have fuel filter problem. you may want to check the pump and filters located in or near the fuel tank.
Go directly to the source ( Fuel Tank, Pump, Filters, Fuel Pressure Regulator and Injectors )
You may have water or grit in the fuel
Hope this helps

Mar 22, 2014 | GMC Sonoma Cars & Trucks

1 Answer

When putting car in R or D car dies


fuel issue possibly MAP sensor or tps sensor? any check engine light?? transmission not shifting??

Feb 18, 2014 | Chrysler Voyager Cars & Trucks

1 Answer

When putting car in reverse or drive car dies


sounds like your automatic transmission is stuffed, take it to a mechanic for a second opinion but it seems to me like you'll need to either rebuild or replace the transmission

Feb 18, 2014 | Chrysler Voyager Cars & Trucks

1 Answer

What is the RPM Redline on a 1988 s-10 pickup?


An engines "red line" is not an exact number. The number shown on a tachometer is a reference.
Max RPM on an engine is determined by several things. Mostly it is the point where the internal components will either fail or not perform correctly. On most stock GM engines the limit is around 6500 rpm. At that point, valve lifters tend to pump up and valve springs begin to bounce.(on an older engine they will bounce earlier) Your ignition coil may also not have the capacity to fully cycle, limiting spark intensity.
As an engine ages, wear plays an important part in this as well. Wear comes in two forms...actual wear to bearing surfaces etc. and stress related problems. Each time a connecting rod travels in a complete cycle it is compressed and stretched. In an older engine this has happened millions of times, making it more prone to failure.
Aside from the limitations I outlined, you need to consider the torque curve of the engine. Most times you will find that peak usable torque (power) is well below the red line. Most stock cams work best between 2,000 and 4,500 RPM. Anything past that though mechanically possible gives you no real usable power.
Simply put, if you took your vehicle to a local dragstrip and made several passes, you'd find that shifting at the red line (assuming 6500) will produce slower quarter mile times than shifting at somewhere near 4000.(closer to torque peak).
Your redline can be changed by replacing old components with new stronger ones and by replacing the intake, cam, valvetrain and exhaust with performance items. Tire size and differential gearing also will influence that.
There are entire books written on this so I hope I managed to explain it well enough for you to understand.

Jan 20, 2011 | 1988 Chevrolet S-10

2 Answers

I just bought a 2001 pontiac grand am se with 99890 miles. I would like to know what rpm is the proper shift point from first to second gear? Mine shifts at like 3000 to 3500 rpm and shifts firmly is that...


Hello,well at what rpm it shifts at of course depends on how hard your pressing the accelerator at that moment,if you floor the accelerator it will shift at higher rpm (red line) but if you take off very slowly it should shift at a much lower rpm....but to answer your question 3000-3500 is a good shifting rpm( if the gauge red lines at 6000-6500 rpm) and firm shifting is a good thing,slow,sluggish and hesitant shifting is a sign of bad things to come from a tranny!! ps keep the engine oil,and transmission oil changed for long life out of your car engine and tranny. good luck and enjoy your new car......yz-maniac.

Oct 12, 2010 | 2001 Pontiac Grand Am SE

1 Answer

Automatic transmission


Transmission will never hold the engine back if it is going through the gears properly.If it gets into high gear, eventually the engine will reach "redline" if you stay into it long enough. ("redline" for any engine is the point at which it cannot run any faster without harming itself.) DO NOT confuse that with proper shift points which should happen just before you reach max torque which happens way before you reach "redline" at which point you are way past the torque peak of the engine, and making no usable torque or horsepower. An example of this is a race engine with a max rpm limit of 10,000rpm.("redline") Depending upon the torque curve (determined by compression, stroke and type of cam grind) you would likely be shifting gears at about 7500 to 8500RPM not at 10,000.
Therefore, your shift points are like climbing a ladder. you get just so high and though there are more steps, you will fall off if you go there. Each time you shift, you are putting the rpms back into the usable power band, till you reach the next step, then start over again. If your trans shifts early the engine will lug and labor. shifting too late and it will quickly reach "redline" and self destruct or go "flat". In a conversion, you need to make sure that the electronics that control shift points are working within the usable torque range.
OR install a manual valve body and shifter and control it like a stick shift car, using your brain as the computer and a tach to tell you where you are.

Feb 20, 2010 | 1998 Jeep Cherokee

1 Answer

Transmision quit shifting spedomitor quit working


The transmission quit shifting, and the speedometer quit working.
When you say the transmission quit shifting, do you mean you backed out of your driveway, started driving down the street, no speedometer, and you just stayed in 1st as the engine RPM's got higher and higher ?
Please explain what has happened. You should also have a check engine light on in your dash. You will have to plug a OBD II reader in to pull any codes, so we can help you find the problem. Please let us know.

Feb 10, 2010 | 1999 Chevrolet Cavalier

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