Question about 1994 Dodge Caravan

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Why acceleration pulses at cruising speed?

Sometimes stalls at decelleration

Posted by mike shviraga on

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emissionwiz

Marvin

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SOURCE: 92 Dakota 5.2 liter starts and idles fine. Runs good under accelleration and decelleration but sputters and bucks at cruise speeds above 55mph. I've done plugs, wires, cap, rotor, oxygen sensor, a

You need to run a fault code test on the ECU. here is how you do that.

Posted on Nov 06, 2012

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Stan Ford

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SOURCE: 92 Dakota 5.2 liter starts and idles fine. Runs good under accelleration and decelleration but sputters and bucks at cruise speeds above 55mph. I've done plugs, wires, cap, rotor, oxygen sensor, a

Remove and clean the throttle body. Have the throttle position censer checked or replaced at the same time. It can cause this fault.

Posted on Mar 14, 2015

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What causes cruise control to work when truck cool but will not once the truck warms up?


suggest checking cable on accelerator throttle arm in engine bay where it connects from cruise control to accelerator throttle arm on engine. Thinking if it is loose it may get looser when hot.
Check connectors on electronics in engine bay on cruise control.
Check sensor for speed. Is it ignition maybe a scotch lock connector that expands with heat and cruise control looses sensor for igition pulses. How does it sense speed ?
Is it magnets on the drive shaft maybe the Hall efect transducer is close to exhaust pipe under car and is being affected by heat.
Is it front wheel drive ? check for a pulse sender on speedo cable in engine bay maybe this is getting cold.

Check cruise control cable is oiled adequately in cable sleeve .

check vacuum connector is ok in engine bay also ?

Aug 13, 2015 | 2003 GMC Sierra 1500

1 Answer

Cruise control not working


Check cruise control cable under hood is tight enough to pull throttle arm.
Check brake pedal . see if wires to cruise control are still attached to switch on brake pedal.
Check magnets are still on drive shaft if rear wheel drive.
Check hall effect transducer is still in place to dedect magnets spinning on drive shaft.
Check Vacuum tubing is ok on cruise control it pulls the cable in and out .
Check if ignition sensing that wire is connected that senses ignition pulses ( front wheel Drive)
Check if a speed sender device is used on speedo cable to create pulse (front wheel drive ) sometimes used to sense speed on some cruise controls.
Check wiring around plugs and sockets under bonnet.

May 27, 2015 | 1998 Mercury Grand Marquis

1 Answer

I want to know how to use my cruise control in my 1994 Toyota pickup. It has all the buttons and the capability but the words are scratched off and i don't have a manual.


Generally... There is ON/OFF - SET - ACCELERATE/RESUME, COAST/DECELERATE. Cruise is available at speeds above 35mph or so. Sometimes there is no main on/off. Cruise on a turn signal stem has a button that pushes in on the end, push when at desired speed. resume/accelerate slides to right, is spring loaded and return left when released. the same lever when slid left is coast/decelerate. Momentarily sliding accelerate and releasing increases crusing speed by a couple mph. If brakes are used cruise disengages, sliding resume returns you to cruise speed after braking. Coast/decelerate disengages cruise, when at desired lower speed hit set. On some, hitting set not needed, when coast is released speed is maintained. Variations may be up/ down instead or may be steering wheel face mounted. Please rate answer. Duct tape is like the force, it has a dark side.. a light side.. and holds the universe together!

Jun 12, 2010 | Cars & Trucks

1 Answer

My 2006 Dodge Magnum hesitates sometimes while in


I had the same problem. I replaced the crank shaft position sensor and it solved my problem. It would stall at intersections and while under light acceleration. It also caused loss of cruise control and a stutter when at highway speeds. Replaced crank sensor and its been running solid for 5,000 miles. $125 fix self installed.

May 03, 2010 | 2006 Dodge Magnum

2 Answers

I just bought a 2004 Nissan Frontier Crew Cab. The problem is a faulty cruise control, you press the on button ant it turns on in the dash board but it doesn't works you press the set button and it jut...


Call the dealer who sold you this car while it is still under warranty and insist that they repair it. The cruise control is quite a complex system and a scan is required to isolate the problem.

If you care to learn a bit more about the system read on:
Cruise control systems are comprised of electronic and mechanical subsystems. This is how they work.
We all know that the things that control the speed of the car are the gas pedal and the brakes. And the brain that normally controls the speed of the car is the brain of the driver. The driver senses the speed by looking at the speedometer and then adjusting the pressure on the gas pedal or the brakes to compensate for variations in the desired speed. The cruise control system does the same thing with one exception. It only controls the gas pedal - it doesn't even know there are brakes in the car!!
The vehicle's speed sensor which is mounted on the output shaft of the transmission (the thing that drives the wheels) sends electrical pulses to the computer, pulses which are generated by a magnet spinning past a sensor coil. When the vehicle's speed increases the frequency of the pulses increases. For any given speed of the vehicle there is a corresponding pulse frequency. It is this pulse frequency which the cruise control tries to maintain as a constant. You think of it as the vehicle's speed.
The brains of the control box of the cruise control has three functions. First, it stores the speed of the vehicle when you press the "set" button whild travelling at the desired speed. It keeps this value in its memory until you turn the ignition off. Second, it receives the pulses from the transmission sensor and compares the frequency of those pulses to the frequency value stored in its memory - the set point. Third, it sends pulses to a vacuum controlled diaphragm connected to the accelerator linkage. The pulses it sends regulates the amount of vacuum the diaphragm receives. The more pulses, the more vacuum and the more vacuum the more force on the accelerator linkage. The system continues to add vacuum force until the set point speed is reached. At that point the system modulates the amount of vacuum the diaphragm receives in an effort to maintain the number of pulses coming from the speed sensor as close to the stored value as possible.
OK, so this "brain" works just fine in controlling the speed of the vehicle until something goes wrong. What can go wrong?
First, the VSS, the thing that sends pulses to the brain might fail. Normally the speedometer also fails so that's pretty easy to diagnose.
Next, the power to the brain can be interrupted. A blown fuse or a corroded connector can prevent the brain from working correctly or at all.
Next, the brains can lose its ability to function. A faulty component can prevent the brain from doing its thing. The brain is a pretty sophisticated box that contains a lot of electronic components including a microprocessor. NOrmally when the brains fail you need to replace the box..
The vacuum diaphragm can develop a leak. If that happens then the cruise control might set and hold the speed for some time however if the leak is larger than the supply line and modulator can add vacuum to the system the system will slowly lose control and the vehicle will slow down. This can also happen if the vacuum line to the diaphragm is cracked or loose.
Finally, the linkage that connects the diaphragm to the accelerator linkage can fail. Some aftermarket cruise control systems use a short length of what looks like fat key chain - bead chain. I have seen several units fail when the chain simply breaks.
Diagnosis of a failed system can be a complex process. Most vehicle shop manuals have a multi-page diagnostic flow chart that the dealer mechanics use to solve failures. If there isn't an obvious problem like a broken wire, a blown fuse or a leaking vacuum line then the problem most likely lies in the brains of the unit or in the switch that sets the speed and contains the other functions of resume and accelerate. Most cruise control switches are on the directional signal stem, a multifunction switch assembly with fine wires that break due to the constant motion of the wires as you use the directionals in your daily travels.

Nov 04, 2009 | Nissan Frontier Cars & Trucks

2 Answers

What are the functions of Resume &Coast buttons in steering wheel


If set at a specific speed and you have to slow down by hitting the brakes, The brakes turn off the cruise control. Pressing resume automatically turns the cruise control back on and accelerates to the previous speed setting. You can also use it to accelerate and by releasing it the new speed will be set.

Jun 18, 2009 | 1996 Mercury Grand Marquis

2 Answers

Stalls at low speed when in cruise control


You sould have recieved a "recall" notice in the mail about the cruise control for fire and failure issues. they are adding a fusable link where the cruise control harness connects to the brake master cylinder. if you have not had the recall performed yet you should SERIOUSLY consider getting it done, mainly so it doesnt catch fire, but "could" be the result of the failure you've been experiancing! btw, almost ALL Ford vehicles have been affected with the cruise control recall. hope this helps!

Apr 14, 2009 | 2004 Ford Explorer

1 Answer

Engine surges under load and not under load


Surging is often caused by a bad sensor in the air/fuel supply - MAP, IAC or TPS. Check for trouble codes (DTCs) using a good code reader.

Feb 09, 2018 | 1997 Pontiac Grand Am

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