Question about 2001 Chrysler PT Cruiser

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Idle goes up and down, check engine light on, brakes hard to push

When I start the car the idle goes up and down, the check engine light is on and the brakes are hard to push down

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  • Anonymous Mar 21, 2014

    idles way high when started and will not idle down and if you put in drive it wants to go what is the cause

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  • Chrysler Master
  • 6,982 Answers

Check engine for vacuum leaks at all hoses, hose connections, intake gasket etc. I have also seen retarded engine timing produce low vacuum. If no leaks, check anything in control system that controls timing...however, I believe you will find a leak before you need to go there. Also check Idle control valve and egr valve for malfunction or blockages.

Posted on May 28, 2009

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Posted on Jan 02, 2017

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Why is it hard to push on the brakes


The most obvious cause for a hard pedal is simply not enough vacuum. Check the brake power booster by pumping on the brake pedal while the car isn't running. Continue pumping until you've "bled off" the vacuum from the booster. Hold the pedal down while you start the car. The pedal should go down a bit more beneath your foot. If it doesn't, then you should examine the connection between the vacuum hose of the brake power and the engine's vacuum.
Replace the brake power booster if the connection's fine, which would fix the hard brake pedal problem.

It may be your calipers need replaced. Check them for signs of wear. Look at the metal spring where the brake pads sit.
Apply tension to the pad and see whether you hear a pop. If you do, the brake pad is moving too much on the bracket. Replace the caliper. This could help the hard brake pedal.

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1984 Honda Accord Brake Problem


well aside from the boosters you may also want to check the possitioning rotor and calipers. there is a possibility that something slipped, or leaked, check for brake fluids and try to trace where it is comming from.

the picture below shows how to disassemble the brakes of an Accord, the only special tool you will need is a ball joint fork to seperate the upper and lower ball joints. You have to remove the whole steering knuckle assembly to get to the bolts in back of the rotor and hub assembly.

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hope this helps

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Idils to high and then goes up and down


Hi Bobby i had a 2004 caviler did the same thing the code that came up was idle air control valve but after replaceing it i got the same code with check engine light on. And idle going up and down with high idle! turns out the brake power booster had holes in it on the back side of it the side that faces the firewall. The best way to check is to pull off the vacume line that goes to the brake booster and put your thumb over it and see if the idle goes down! If it does that,s your problem. also check all vacum lines! Hope this helps you out... Ed

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I have a 2002 LW200 wagon with L61 Eco-tec. I installed rebuilt engine. Put back old IAC. I checked pintal to make sure it was 20MM. Engine starts great but idles at 2300-3000. After a few seconds the...


throttle position switch sounds like getting false readings to computer,
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Finding the idle goes up n down/die out when using Defrost


Sounds like a vacuum problem. Do you have a seemingly hard brake pedal? If you do chances are your brake booster is leaking vacuum. If not check your vacuum lines. Your heater system is controlled by vacuum.

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86 chevy one-ton pickup dually brake problems


If you're not losing any brake fluid then it sounds to me as though the master cylinder is bleeding fluid between to two chambers allowing fluid to pass from one to the other which would decrease the pressure on one of the lines leading to the proportioning valve, thus setting off the 'brake' light.

Orrrrr,

IF it does NOT have the hydroboost system the following steps MAY help diagnose if it's a booster problem.

(Copied and pasted from a youtube comment)

Test 1) 1. Start the car 2. Let it idle for 2 minutes 3. After 2 minutes turn off the car 4. Pump the brake pedal 3 times 5. The pedal should rise every time if it does then the Booster and Check valve are OK 6. If the pedal doesn't then the is an issue with the either one, run tests 1 and 2.

Test 2) 1. Start the car 2. Let it idle for 2 Minutes 3. After 2 minutes push down the brake pedal and HOLD it 4. While holding the pedal down turn off the car 5. The pedal should NOT rise for at least 30 seconds 6. If it doesn't rise then the Check Valve is good 7. If the pedal rises before 30 seconds then the Check Valve is faulty.

Test 3) 1. Shut off the Engine 2. Pump the brake pedal 4 times 3. On the 4th one keep it pushed down and start the car while holding the pedal down 4. The pedal should sink down. 5. If it sinks, the booster is Fine.

Myself, I'm leaning towards the master cylinder having an internal 'leak' or bypass problem.

Hope this helps.

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I have 1999Chevy suburban with 6.5 turbo diesel motor.it idles up and down and when driving the gas pedal is real touchy Wat is the problem and were do i locate the problem


Check the help links related to this problem.Click the link below to go through its troubleshooting procedure :-----Idles rough and quits when gas pedal is pressed less? http://technoanswers.blogspot.in/2012/01/1999-ford-f-150-idles-rough-and-quits.html---------
Car won't start without hitting the gas pedal? http://schematicsdiagram.blogspot.com/2011/12/car-wont-start-without-hitting-gas.html
-------Complete loss of brake pedal then all gets normal? http://repairhelpcenter.blogspot.com/2012/01/complete-loss-of-brake-pedal-then-all.html
------Car dies when gas pedal is pressed? http://schematicsdiagram.blogspot.com/2011/12/car-dies-when-gas-pedal-is-pressed.html
--------Pushing on the gas pedal, but the car slows down? Gas pedal to the floor and the car slows down?

http://technoanswers.blogspot.in/2012/02/pushing-on-gas-pedal-but-car-slows-down.html

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After replacing brake rotors and pads, brake pedal remains on floor? http://technoanswers.blogspot.in/2012/02/after-replacing-brake-rotors-and-pads.html

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accelerator pedal sensor? http://technoanswers.blogspot.in/2012/02/2009-chevy-impala-accelerator-pedal.html

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For rough idle issues and problem troubleshooting,go through the help links provided below :----- van idles rough?

http://howtobyme.blogspot.in/2012/01/2004-ford-freestar-van-idles-rough.html

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will not idle when cold?

http://technoanswers.blogspot.in/2012/02/ford-explorer-40-will-not-idle-when.html

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runs lean and idles rough?

http://technoanswers.blogspot.in/2012/02/ford-runs-lean-and-idles-rough.html

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Engine stumbles coming off idle when warm?

http://repairhelpcenter.blogspot.com/2012/01/engine-stumbles-coming-off-idle-when.html

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Erratic idle on car?

http://schematicsdiagram.blogspot.com/2011/12/erratic-idle-on-car.html

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Low idle when cold out side?

http://repairhelpcenter.blogspot.com/2011/12/low-idle-when-cold-out-side.html

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Idle Air Control (IAC) Valve Replacing?

http://schematicsdiagram.blogspot.com/2011/12/gmc-idle-air-control-iac-valve.html

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Engine quits at idle?

http://repairhelpcenter.blogspot.com/2011/10/engine-quits-at-idle.html

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Car overheats and Air blows hot at idle?

http://howtobyme.blogspot.com/2011/11/car-overheats-and-air-blows-hot-at-idle.html

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While stop engine idles like cylinder missing?

http://schematicsdiagram.blogspot.com/2012/01/while-stop-engine-idles-like-cylinder.html

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This will help.

Thanks.

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3 Answers

Would an idle control valve cause a car not to accelerate?


no, idle air control valve is literally to control your idle speed.
what happen when you press on gas? car shakes, RPM goes up, or engine just bogs down?

Mar 09, 2010 | 2004 Infiniti I35

1 Answer

Check engine light on car dies when I touch brake


Check Engine light is on. Find out what DTC (diagnostic trouble code) is set and I can help you more. You can get a code puller from your local parts store.

Dec 30, 2009 | 2005 Kia Amanti

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