Question about Dodge Ram 1500

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Transmission surge at cruise

When on cruis control at 100kph as I start up a hill and power is added, not enough to cause a downshift, I get a 'bump' repeatedly, it feels like I am hitting small debris on the road.

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  • dale232 Nov 25, 2013

    2005 Hemi 5speed auto

  • dale232 Nov 26, 2013

    Ok, more info, tried as suggested but it is not only while on CC. Most easy to reproduce on Cruise but I can reproduce it without. It has to be trans related, feels like a band slipping but rengageing in a split second and firmly. maybe the convertor clutch is poping on and off?

  • dale232 Nov 27, 2013

    I was speaking with a trans specialist, he insists it cant be trans related. in his words "there is no way a solinoid could empty and refill to engage or disengage that fast" He is convinced it is a cracked coil or some other electrical fault causing the engine to momentarily have no spark when at low RPM and the high voltage system is under the most load. Its likely happening at higher RPM but not noticeable.

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  • Dodge Master
  • 44,413 Answers

Check the rpm and road speed when this happens . The cruise control will increase to keep RPM constant but as the road speed drops the auto may be shifting down and as the rpm increase it shifts back before the rpm adjusts. You can override a cruise control in this situation by simply pressing down on the accelerator to maintain the power setting and road speed and when the situation is passed and you take your foot of the accelerator the cruise control will return the system to the set position without you needing to do anything

Posted on Nov 25, 2013

Testimonial: "Rpm does not bounce but holds steady when this happens. And it is confirmed not Cruise Control related as I can reproduce it manually."

  • 2 more comments 
  • Bill Boyd Nov 27, 2013

    run fault codes for the transmission and check for faulty transmission control module. Have the band and clutch pack adjusted . If the torque converter clutch was faulty you would not be moving at all. But if the tcm is faulty it will affect the torque converter clutch servo operation

  • Bill Boyd Nov 27, 2013

    Interesting comment from the transmission specialist but I feel that if you have an electrical problem it will be across the board. Find a transmission shop that will do the tests. I have seen a band actuator with the back broken out and the band would slip under pressure but be all right when it wasn't activated

  • dale232 Nov 27, 2013

    But would in such a case the band renegage in a split second with firm engagment? Unlikely, band problems should equal uniform under power slipping.

  • dale232 Nov 27, 2013

    I have Tourque-Pro and no codes are appearing.

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1 Answer

What causes the speed to fluctuate when you set the cruise control?


if it just started to happen you may have lost a magnet off the drive shaft. If it is a front wheel drive then you would have two magnets on the flywheel if you lost one magnet it would cause problems.
The other possible cause if the sensitivity setting is set too sensitive then the cruise control will surge .
Setting it lower will allow it to slowly respond to speed changes but if going up hill it will take a while to increase the acceleration . Or going down hill it could accelerate too much before the cruise control realises it is going downhill
Also a very wet road can cause the wheels to spin and cause the cruise control to lose the plot and accelerate to dangerous speeds.
I have had this happen to myself once so be wary of cruise control use in wet conditions.

Jan 14, 2017 | 1992 Honda Accord

1 Answer

07 ford territory brake lights flick on and are very touchy, due to this cruise control disconnects randomly on bumpy road. Can brake switch by pedal be adjusted so it's not so sensitive?


Alarmingly, the speedometer needle steadily winds down from 75 mph toward 50. Just as you uncurl your feet and try to accelerate back to traffic speeds, the vehicle downshifts with a lurch and abruptly climbs back to over 80 mph. So you tap the brakes and disengage the cruise control to avoid a conversation with one of the many law enforcement officers lurking behind every other billboard. Toggling the Resume switch settles things down, holding to a legal speed on both the uphill and downhill sections of the interstate. The kids in the back seat have stopped threatening to throw up, too. Then you look in your mirror 20 miles later and see the lights. Red and blue flashing lights. You're doing over 85 mph and, odds are, Smokey isn't going to believe you have the cruise set to 70. Time to find out why your cruise control has a mind of its own.
IT'S NOT A BUG, IT'S A FEATURE
Does your cruise control fall out of engagement partway up steep hills? Actually, it will normally drop out if the engine has to work too hard, mainly because after a while there isn't enough vacuum left to pull in the servo after sustained near-wide-open-throttle. You'll just have to put your foot into it. Downshifting helps. Do you have to ride the brakes on longer downhills to keep from building up excess speed? That's normal too. The cruise control only has authority to reduce engine speed to idle. It doesn't activate the brakes. Modern cars, in an attempt to improve mileage, have very tall gear ratios, low-friction engine designs, low-rolling-resistance tires and optimized aerodynamics. That long downgrade outside of town may have accelerated your '60s-era Pontiac to only a couple of miles per hour above legal. But, it may well propel your new economy car to blatantly ******* velocities unless you intervene by braking or downshifting. Does the Cruise icon on the dash light up when you turn the switch on? Duh. Check the fuse. You may need to look in the owner's manual to see which one if it's not tagged on the fuse box cover. An aftermarket cruise may have an inline fuse holder in the wiring to the controller.
If there is power to the system, the next check is the brake lights. Brake lights? Yup, cruise controls have a switch to toggle them off when you touch the brake pedal, and many use the same switch as the brake lights. If one of the brake lights has failed, the cruise control thinks the brakes are on all the time and won't come on. Same result if the switch is incorrectly adjusted or broken or jammed. Wait, there's more--if your vehicle has a manual transmission, there's a similar switch on the clutch pedal. You may need to break out a test light or multimeter to verify the function of this array of switches. These switches usually are normally closed switches, and close their contacts when the pedal is depressed. We've seen several cases of intermittent cruise control dropout caused by a brake light switch that was adjusted very tight. Any small bump would jiggle the brake pedal down far enough to toggle the brake lights on for a brief instant--long enough to shut down the cruise. Adjusting the switch to specs (usually so the brake lights come on after the pedal travels 1/2 in.) fixed it.

Mar 31, 2016 | Ford Cars & Trucks

1 Answer

I have a 2014 CTS. When traveling downhill with cruise control engaged, the car will downshift 2 or 3 gears causing the rpm to run up over 4000. Is this normal operation for these cars?


This is normal if you are going up hill but if you go down hill there should be very little work for the engine and transmission to do.
Going up hill as the engine starts to pull it is normal to kick into a lower gear to give the car more pulling power. If it does it in the down hill mode you should get it checked like low fluid or something.

Jan 30, 2015 | Cars & Trucks

1 Answer

Car surging


Is the car equipped with the Automatic Transmission?
If so, read on.
Otherwise skip to the end and answer some questions.

POSSIBLE SCENARIO:
I have observed a condition where my car surges slightly when the torque-converter clutch (TCC) cycles between lock and unlock when driving on an uphill grade.
First some basics and history that will explain why the TCC is used.

Engine, Torque Converter, TCC, and Transmission relationship--
The TCC allows for a solid connection between the engine and transmission which allows the input to the transmission to rotate at the same speed as the engine.
Without a TCC, there is slippage between the engine and automatic transmission. The slippage is greatest at low engine RPM. That is what allows the engine to run with the automatic transmission in gear, like when you first shift into gear or stop at a stop sign. When the throttle pedal is depressed, the engine RPM begins to increase and the torque converter begins to slip less and less the more the engine RPM increases. The car moves. But even at cruising speeds the torque converter slips slightly. Engine RPM is greater than transmission input RPM, which is realized as slight decrease in fuel efficiency.
When acceleration is complete and a constant speed is being maintained, the engine power output is reduced to the point where the TCC can engage and eliminate any slippage between the engine and transmission. If the car has a tachometer the engagement of the TCC can be verified when a slight reduction in engine RPM observed without a corresponding change in vehicle speed.
One method used to test the operation of the TCC is as follows:
Find a flat section of road where it is safe to perform the test.
Reach a steady speed and keep the gas pedal depressed with one foot. While observing the tachometer (or listening for an increase in engine RPM), with the other foot depress the brake pedal enough to activate the break light switch but not enough to engage the brakes. When the brake light switch activates, the TCC receives a signal to disengage. With the gas pedal being held steady, release the brake pedal and the engine RPM should decrease when the TCC engages.
Old cars with Automatic Transmissions did not use a TCC. I believe the TCC was put in use in an attempt to increase fuel economy.

MY EXPERIENCE WITH SIMILAR SYMPTOMS
The condition that causes that issue on my car is this:
- A slight uphill grade increases the load on the engine.
The car tends to gradually slow and it is necessary to depress the gas pedal to maintain speed.
- Depressing the throttle pedal (manually, or automatically with cruise control engaged) signals the torque converter clutch to unlock when the load increases slightly. (A more drastic load increase would signal the Transmission to downshift to a lower gear.) The corresponding increase in engine RPM and output is enough to compensate for the reduction in speed. When the vehicle speed, engine RPM, and throttle position stabilize to the point that the TCC will engage and the engine RPM will reduce in correspondence with TCC engagement. Now, if the road conditions have not changed, power output is not enough to maintain vehicle speed. With the increased load caused by full engagement between engine and transmission, and the cycle (surging) repeats itself until the road conditions change.

Does that help?
If not:

QUESTIONS
Please define the symptoms.
What are the road conditions when the surge occurs? (A slight uphill grade?)
What is the frequency of the surge?
Does the engine power output have a noticeable surge?
Is there a speed change related to the surge?
Does the tachometer move up and down with little or no change in vehicle speed?
Are all instrument indication in the normal range?
What else has changed?

Good luck!

May 24, 2014 | Subaru Impreza WRX STi Cars & Trucks

1 Answer

Cruise control not working in 5th gear ford c max 55reg


Hi, did you already solve this problem with cruis control in european Ford Focus C-Max? I just activated cruis control in my car... It normaly works on 3th and 4th gear (manual transmission). On 5th gear it works only sometimes - I have to put the gas pedal down and then press the "+" or "RES" button, if I cancel selected speed and than again press "+" or "RES" button, the LED of cruis control on the dashboard flash for 1 sec and nothing will happen.

Feb 17, 2013 | Ford CMax Cars & Trucks

1 Answer

My transmission (i have the big ford ******) shifts fine most of the time but when i go up a hill it will barelly climb the hill unless i turn off the overdrive and it doesnt want to go when u press the...


Sounds like you're not getting a downshift and/or the Torque converter isn't disengaging from lock-up position.
IF it's a valve body problem,adding 2 cans of SEA-FOAM transmission treatment and following directions might free it up so it downshifts.It's worth a try.
Now a `little-known' problem with rear DRUM brakes can occur going uphill especially if a wheel bearing gets enough up-down play to let the brake shoes drag.It really CAN happen! don-ohio

Sep 11, 2011 | 1993 Ford F150 SuperCab

1 Answer

Engine raced with sudden loss of power climbing hill


Sounds like the transmission went south on you..(surge and power loss was the trans not sending power to the wheels, allowing the engine to freewheel as the cruise applied more power to try and maintain speed).Depending upon how high the rpm's went when it let go, it may have damaged the engine, but that remains to be determined...Your mechanic will likely concentrate on that before putting a transmission on a wounded engine. The one grain of hope in what you said is that it remained running while you had the a/c on waiting for a tow. Good Luck!!

Jul 10, 2009 | 1998 Toyota Camry

2 Answers

Ford freestar having cruise control and transmission problems


found the brake petel switch sticky and tapping the pettel a couple of times allowed the cruis light to stay lighted and it worked on mu 2006 freestar.

Feb 16, 2009 | 2006 Ford Freestar

1 Answer

2009 Toyota Camry problems


All Toyota auto trans cars downshift when descending a hill when you tap the brake. This is called "Downhill Shift Logic"; what this is for is to eliminate the double shift when you come to the bottom of a hill and then accelerate. Normal condition. Usually happens above 38 MPH.
Also: The cruise will accelerate when going uphill. Normal condition.Plus: The cruise will not disengage back to the set MPH after you top the hill. Toyota recommends to disengage the cruise when encountering steep terrain.

Sep 09, 2008 | 2008 Toyota Camry

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