Question about 1996 GMC Jimmy

1 Answer

Three different mechanics have tried and failed to identify and correct this problem. The problem: while driving at cruising speed paraticularly on a trip (50-150 miles), the car will lose power, as if it were out of gas. If the car sits overnight (after being towed to a garage or home), it will crank and run. As a result of the mechanic is unable to diagnose this problem. This has happened five time over the last three months. This Jimmy as been a wonderful car. I hope you have some suggestions to solve this problem.

Posted by on

Ad

1 Answer

  • Level 1:

    An expert who has achieved level 1.

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

    Vice President:

    An expert whose answer got voted for 100 times.

  • Contributor
  • 296 Answers

You really need some diagnostic information.

For instance, if this is fuel injected, a pressure gauge on the supply side that you can see while driving would yield useful info on whether the fuel pressure has gone away. That would also be helpful if it has a carburetor.

You could be suffering the electronics overheating.
You could be suffering the fuel pump in the tank overheating, if you are equipped with that.

Another thing that you can do is make a arrangement with a repair shop, that you are going to drive till the problem manifests, then immediately have the car towed to them for IMMEDIATE diagnosis. Make an arrangement that when the car arrives they will drop what else they are doing, and look into your car.

Then drive a grand loop on a highway within close distance of that shop.

They then can see whether you have lost fuel supply, or if the electronics have stopped delivering fuel (injectors firing feebly, etc.).

You need to get the car looked at while it is experiencing this problem.

I suspect this will be an easy fix: Fuel pump, or electronic control module, fuel pressure relief valve, fuel filter. I doubt this is an engine-is-broke problem.

Posted on Aug 04, 2010

Ad

1 Suggested Answer

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of.(from cars to computers, handyman, and even drones)
click here to download the app (for users in the US for now) and get all the help you need.
Goodluck!

Posted on Jan 02, 2017

Ad

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

When I use the cruise control, it works beautifully up to about 60kph. If I try to set it at any faster speed it wants to pull it back to 60...is there a factory reset or something?Thanks Jeremy


Search Results

    Fixing Faulty Cruise Control - Popular Mechanics

    www.popularmechanics.com/cars/how-to/a116/1272586/
    Just as you uncurl your feet and try to accelerate back to traffic speeds, the vehicle ...vacuum left to pull in the servo after sustained near-wide-open-throttle. ... are designed not to remember their set speed if the vehicle speed falls below 25 mph ... If one of the brake lights has failed, the cruise control thinks the brakes are on ...

Jan 27, 2016 | Cars & Trucks

1 Answer

How do I engage cruise control on unidentified vehicle?


Hi Ted:
If you can't identify the vehicle, all I can do is suggest that you use "trial and error" as the preferred method.
Start with the engine off and look at all of the controls.
When you find the cruise control, look carefully at all of the components. There should be:
- ON/OFF
- Set
- Cancel
- Coast
- Resume
Or any of a bunch of different terms that relate to functions.
Once you find the specific controls, and identify the functions, engaging it is usually just a matter of pressing the ON control. and then the SET when the desired speed has been reached.

Sep 10, 2015 | Cars & Trucks

1 Answer

1995 nissan sentra automatic trasmission will not go into passing gear


Gear shifts happen depending on how far the gas pedal is
pressed & the load on the vehicle

Transmission pressures change as you drive under different conditions,so the shifts happen at different speeds

There is no passing gear

If you have a 4 speed,you have 3 forward gears & an overdrive
forward gear, plus torque converter lock-up

You saying you have no 4th to 3rd downshift or whatever

Maybe the transaxle is failing mechanically inside-worn out

Mar 15, 2014 | Nissan Sentra Cars & Trucks

1 Answer

2010 Nissan Pathfinder Cruise Control issues


First I'll assume you haven't read the owners Manuel, Cruise control is not perfect on any vehicle. if coming to a hill put foot on gas to help rpm, going down hill put foot on brake to keep same speed, cruise control operates off of engine vacuum. Speed sensors can be affected by putting on smaller or bigger tires than what is on drivers door.

May 24, 2017 | 2010 Nissan Pathfinder

1 Answer

Cruise control not engaging


Hi there,

As you have not stated the Model of Chev, nor the Year of Manufacture, I will give you some general possibilities:

* Blown fuse
* Short or open in Cruise Control circuit
* Faulty brake switch
* Leaking vaccuum circuit
* Faulty cruise control switch
* Faulty stepper motor
* Faulty transducer
* Faulty speed sensor
* Faulty cruise control module

As with all electrical circuits, you should first check the FUSE.

However, from experience, the most common cause of inoperative Cruise control are:

Brake pedal switch: check that tail lights illuminate when depressing the brake pedal. If not, then replace the brake pedal switch (located up on the brake pedal assembly).

Brake pressure switch: depending on which model Chev you have, there is an electrical switch (look for wires) screwed into the brake cylinder (attached to the brake booster). This switch is a cruise system backup from the pedal switch and measures brake fluid pressure, to disengage the cruise control. When this switch fails, the Cruise Control will not engage. If you have a multimetre, you can test the resistance on the switch terminals (ask Chev for the correct resistance spec) - if not to specification, then replace the switch.

Cruise control release valve: this is the alternative to the brake pressure switch and is also mounted on the brake pedal, above the brake switch. This switch is designed to disengage the cruise control, just like the pressure switch. If you have a multimetre, you can test the spec of this switch (ask Chev for the correct test procedure & specs) - if not to specification, then replace the switch.


NOTE: depending on the year of your vehicle, your local Chev Dealership will be able extract the Cruise Control fault codes, stored in the Cruise Control Computer. This is always the fastest (and cheapest) way to identify the suspected component and will eliminate unnecessary "trial and error" labor costs. This test cannot be done by your typical garage and must be entrusted to your Chev approved service agent only, who will have the correct Scan Tool.





"Please take a moment to rate this solution with a 'testimonial' and/or 'thumbs up', as this will keep my status active and allow me to continue offering technical support. Thank you."






Jul 31, 2011 | Chevrolet Chevy Cars & Trucks

1 Answer

Speed sensor failed. can i replace it


Sure you can if a mechanic can do it so can you if you have the right tools and knowlege. First you need to know which one thers's one at each whell at the fround rear end housingf the rear rear end housing and the one in the side of the transfer case where the speedometer cable would'of connected on an older model and then theors three in the sides of the trans mission, Touque converter speed forward turbine speed output turbine speed. What proble are you trying to fix? the speedometer not working? Abs light on? Cheack engine light on? Cruise control not working? If the cruise control does work the speed senser is good and the check engine light will be on if the speed senser is'nt working. If the speed senser is'nt working the car will only take off in low and not shift to seecond or any higher gear as the computer doesn't know how fast the car is going. If the speedometer is'nt working and it does shift and cruise and the check engine light is'nt on then the speed senser is working but the speedometer is'nt if it is'nt and everything else is woring then as your driving hit the speedometer with your fist and see if it comes back on they can get stuck and i've fixed quite a few and they stayed fixed. On to wheel drive models with the rear wheels jacked off the ground safty I've run the car up to speed and trying wiggleing the wires and connectors till I wiggled the right thing till the speedometer came on ( including smacking the speedometer ) Just don't hit it too hard as it'll bust just like anything else.

Dec 21, 2010 | 2005 Jeep Liberty

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

1 Answer

My Cruise Control Wont work, is there a special way to turn on the cruise, because the sign for cruise comes up but it doesnt cruise


First, your car must be in gear and driving approx more than 60 km an hour
Secondly, using the Cruise Stalk switch turn the Cruise on, the dash should now have a lit icon for cruise power (green).
Once you have the desired speed, gently press the button on the end of the cruise in to set your speed. Remove foot from throttle and confirm cruise is active. Another dash light should come on as well (orange)

Failing that, if it doesnt work the usual suspect like fuses and the brake pedal micro switch should be looked at...

Aug 08, 2009 | 2007 Toyota RAV4

2 Answers

When driving, Speedodometer drops to zero.


I thought this year of Santa Fe had a 100k Warranty? If so, take it to the dealer and get it fixed. Even if it's not under warranty, take it and get it fixed! This is dangerous to use with the cruise control!! Do not use the Cruise Control until you get this fixed. It sounds like a bad speedomoter sensor, and that is confusing the Cruise Control. Either your speedometer is going to stop working altogether, or your going to RAM someone from behind going at a DANGEROUS rate of speed. Take it and get it fixed, and do not use the Cruise Control until it is fixed.

Jul 19, 2009 | 2003 Hyundai Santa Fe

1 Answer

Loosing power at cruising speed


have you had the transmission flushed? it seems to be caught in a limbo. where the calibration of the speedo and the transmission are not compatable. Now as wierd as that seems it happens usally like when going up a hill if you have a manual trans. and cruise locked in. it cant hold that speed and moves to a different speed if you dont down shift. Or perhaps your cruise control cable is slipping. is it vacume over mechanical? pop the hood and make sure all your hoses to cruise control are tight and no leaks.

Feb 12, 2009 | 1998 Mercedes-Benz C-Class

Not finding what you are looking for?
1996 GMC Jimmy Logo

Related Topics:

26 people viewed this question

Ask a Question

Usually answered in minutes!

Top GMC Experts

yadayada
yadayada

Level 3 Expert

76848 Answers

Freddy

Level 3 Expert

1311 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22246 Answers

Are you a GMC Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...