1996 Jeep Grand Cherokee Logo
Posted on Jul 19, 2009
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Vehicle engine seems to stall at low revs or approaching a stop, been doing that last few days. Now brakes do not seem to have any power assistance. Any thoughts, think this is now not fuel related and rather an electrical problem.

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  • Posted on Jul 19, 2009
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Check for a vacuum leak... the brake booster could be bad and need replacing.
check the vacuum hose that runs from the brake booster to the manifold. Sometimes they crack, leak, or get partially disconnected...the gromet on the booster itself as well.
Good luck...i hope this helps.

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  • Expert 56 Answers
  • Posted on Jul 19, 2009
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It could be your Idle Air Control. which could be dirty. or maybe faulty.
A good cleaning will fix the problem or a replacement would work too.
The idle air control valve is located on the back of the throttle body. It has an oval electrical connector and two torx screws holding it in. Unplug the connector, remove the two screws then lightly tap the body with a soft faced mallet to loosen it from the body. Once you have it out and prior to installing a new valve clean the seat inside the throttle body where the idle control fits. This must be very clean! Installation is in the reverse order. Btw, to save some cash, pull the valve out and clean it, this usually fixes the problem for quite a while. Replacement would be best, but its up to your budget.

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Anonymous

  • 35 Answers
  • Posted on Jul 19, 2009

SOURCE: Vehicle has been stalling or engine cutting out at

if your cars fuel is not electronically controlled... try overhauling the carburator. brake problems? replace the vaccum pump assy.... then drain the air out of the brake fluid drain nipple located in each wheel your going to need assistance here.. someone has to continually step on the brake while u bleed the air bubbles on the fuel line.... when ur help feels the peda is getting heavy.... close the nipple and repeat the procedure on the other tires.... be sure to wear protective glass brake fluid burns.... good luck...

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Stalling for a few seconds when leaving a stop sign. This is an intermittent problem. Seems to happen most of the time when turning left when leaving a stop sign. Stalling also happens when rolling slow at...

Is the brake fluid reservoir low? The master brake cylinder may be leaking, the fluid getting sucked into the brakes power booster and then into the vacuum of the intake manifold. Check the vaccuum hose to the brakes power booster to see if it is wet inside with brake fluid.
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MOTOR CUT OUT , OR WONT IDLE AT STOP STREETS OR ROBOTS oIL LIGHTS START FLICKERING AND ENGINE STALLS

if this is happening when the foot is on the brake, then it is possible that the brake booster is leaking air and running the engine too lean.
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Brake failure

If you are talking about the brake pedal being stiff and too hard to push, then working easily again - it sounds like you temporarily lost the power assist. This will happen again and it is not safe to drive until properly repaired.

Many decades ago cars had no power assist and took much more foot pressure and much longer distance to stop. So your brakes were working, just not the assist.

The power assist is provided by a vacuum line from the engine. The likely causes of the failure are: stalling or stopped engine, leak in hose from engine to brake assist booster or leak in the diaphragm inside the brake booster. There are also other much less likely causes from brake fluid lines and the master cylinder. Regardless, don't drive knowing the brakes are likely to fail.
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Vehicle has been stalling or engine cutting out at low revs over last fews days, thought it may have been fuel related. Now brakes have little or no power which makes me think that both issues are related...

if your cars fuel is not electronically controlled... try overhauling the carburator. brake problems? replace the vaccum pump assy.... then drain the air out of the brake fluid drain nipple located in each wheel your going to need assistance here.. someone has to continually step on the brake while u bleed the air bubbles on the fuel line.... when ur help feels the peda is getting heavy.... close the nipple and repeat the procedure on the other tires.... be sure to wear protective glass brake fluid burns.... good luck...
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My 1998 900S run fantastic until you come to a red light. While applying the brakes the engine seems to shudder (idle up and down). Now I have an automatic transmission so the idle should be constant...

try the following it usually cure s this kind of problem
Here is the most common cause of surges and stalls at stops and low erratic idle speed and rough idle, it is the idle speed control air-bypass valve and throttle valve (IAC for short), they get full of gunk over the miles and cause idle issues (stalls, low idle) like yours, Get a can of intake cleaner from any local parts store, not carb spray, intake cleaner, it is made by a company called CRC, remove the air intake hose to the engine, hold the idle high so the engine won't stall, then spray the can of cleaner into the intake while keeping the engine running, use at least 1/2 the can, shut down the engine and disconnect the battery for 5 minutes, then restart and complete a number of mixed driving cycles, town, freeway, stop and go etc., after a few days the problem will go away as the system will relearn to the clean intake
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1990 Sedan Deville with 4.5 PFI

You might have a vacuum leak or maybe the engine is running so poorly that it's not developing the needed vacuum to get good brake assist.

If you need further help, I’m available over the phone at https://www.6ya.com/expert/oscar_403cc49e0f00cda7

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I am currently experiencing engine idle problems, i have recently purchased the vehicle and the engine has been fine until now. When i stop at junctions and the engine is idleing it seems to now and again...

You need to replace your IAC (idle air control valve). The IAC, like it sounds, control the idle of your car. When they go bad they will cause the low idle and stalling. The IAC is located on the throttle body and is usually held on with a couple of screws. It is an easy relatively cheap fix that you can take care of by yourself. Let me know if you have any more questions. Thanks for rating my response and for using FixYa!
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