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Ask A. Penland Your Own Question
A. Penland
A. Penland, Ford Senior Master Technician, ASE
Category: Mercury
Satisfied Customers: 6593
Experience:  ASE Master Certified. ASE Gasoline Engine Performance Certified,Ford Senior Master Technician
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2001 mercury sable does a putting thing when press brakes

Customer Question

2001 mercury sable does a putting thing when press brakes
Submitted: 1 year ago.
Category: Mercury
Expert:  A. Penland replied 1 year ago.

Can you better describe the problem you are having with your 2001 Sable?
Does the engine stall when stepping on the brakes?
Does the vehicle vibrate when stepping on the brakes?

Customer: replied 1 year ago.
Vibrates when stepping on brakes.
Slow to accelerate.
Expert:  A. Penland replied 1 year ago.

How does the engine run at idle?
Does it run rough?

Customer: replied 1 year ago.
No. Only when on the brake.
Expert:  A. Penland replied 1 year ago.

Is the brake pedal hard to push and is it hard to stop the vehicle?

Customer: replied 1 year ago.
Not at all. They work great actually. Just the putt putt when at light or stop sign or backing out with foot on break.
Expert:  A. Penland replied 1 year ago.

Sorry for all the questions, I am just trying to narrow down the problem.

Is there a hissing noise under the dash when you step on the brakes with the engine running?

Customer: replied 1 year ago.
No. No hissing. I've been googling and would the idle air bypass valve be a possibility?
Expert:  A. Penland replied 1 year ago.

What I am looking at is a leaking power brake booster. The brake booster works off of engine vacuum and when you step on the brakes with the engine running, the vacuum booster requires more vacuum which can cause the engine to run rough or stumble. You can try a simple fix, and see if it takes care of the problem since you have read up on the IAC valve. Remove the IAC which is located on the throttle body where the rubber boot from the air filter connects to the engine. Take the IAC off and clean it and also clean the throttle body. Then reassembly it and road test it to see if the problem is gone. You can use a throttle body cleaner to clean both of them and any auto parts store will sell it.

Customer: replied 1 year ago.
Ok will do. An i able to continue this conversation tomorrow after ive tried that?
Expert:  A. Penland replied 1 year ago.

Yes, just reply back on this page. We can talk back and forth till we fix your problem or till your satisfied.

Customer: replied 1 year ago.
Awesome. Thanks for not leaving me lol!
Expert:  A. Penland replied 1 year ago.

No problem. I am on line in the evening after I get off of work from my dealership.