Question about 1999 Mazda 626

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Idle is rough

When stepping on the brake the car idles rough, when letting off the brake it smooths out. What could it be ?

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  • 335 Answers

Bad check valve in the brake booster where the big vacuum hose connects,Go to Mazda and get one an aftermarket one may not work as well Mazda is pickey when it comes to replacement parts

Posted on Aug 07, 2008

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I have a 2006 GMC Envoy, idles rough at a stop when in gear, but levels out smooth when in neutral. Drives smooth on the highway.


check for a vacuum leak in the brake booster. Check this by just allowing the engine to idle with the hand brake on and if ok then put your foot on the brake and if the idle changes then there is an air leak in the booster.

Jul 27, 2014 | Cars & Trucks

1 Answer

Why does my 1989 camry 2.2 4 cylinder at initial start-up idle smooth, but upon warm-up idle rough and erratically.


Clean throttle body might help
ck alt 12.5 iDle 13.5 1000 rpm
also run gas low and put fresh new gas gas add'
replace cap rotor wires.ck for obd codes.Let me know

May 20, 2014 | 1989 Toyota Camry

1 Answer

1994 nissan altima rough idol when stoped runs


My 1994 Altima has always had rough idle but runs smooth. I now have 176,000 miles on it and drive it daily. Best car I ever owned. I wouldn't let the rough idle bother me.

Jul 28, 2010 | 1994 Nissan Altima

1 Answer

I have a 1994 Honda Accord 4 door v6. I have rough idle when in drive and smooth idle when in neutral. Also rough take offs from a stop or slow speeds. If I pump the gas pedal a few time the rough take...


  • does the engine miss? bumps is a rythmic pattern?
  • an engine miss will appear to diminish at higher rpm due to centrifical force.
  • other possible problem broken or flat motor mount.
  • is the idle rough in reverse?
  • if not
  • open hood
  • start engine
  • Left foot on brake (hard)
  • start engine
  • watch engine as you select drive
  • still holding brake with left foot / throttle gas with right foot
  • does engine dramatically move?
  • if so replace motor mount on offending side
  • if not possible engine miss or transmission problems

Jul 10, 2010 | 1994 Honda Accord

1 Answer

Rough idle at higher rpm smooth


You have a vacume leak somewhere. You can try to listen for it or you can get a can of brake parts cleaner and spray it around the engine. Anywhere there is hoses or connections of any kind. When you find the leak the engine RPM's will increase. If thats not the problem it could be your EGR valve is clogged or your map sensor could be bad. Those things would usually cause a check engine light. Vacume leaks wont. Good luck

Jun 19, 2009 | 1985 Chevrolet Chevy

1 Answer

Running roug at low idle, smooths out at 2500 rpms


change plug and wire if its been a while most cars have 90000 miles platinum plugs in them.but the wires wear before plugs.so change plugs and wires.+clean fuel injectors .change fuel filter and air filter.if car still run rough your idling to low.have idling check .

Jun 06, 2009 | 2001 Oldsmobile Alero

1 Answer

After washing truck check engine light came on.


let up hood let it idle to dry watch the check engine light . it should be okay.let it idle it will smooth out.

Apr 12, 2009 | 1990 GMC Sierra

1 Answer

Rough idle - white smelly exhaust


the roughness at idle is the shocks .replace the shocks. i had the same problem

Jan 18, 2009 | 2002 Jeep Grand Cherokee

1 Answer

Rough idle


have this car taken to an auto repair and ask for a engine oil flush and engine oil change, that mught help

May 27, 2008 | 1999 Mercury Grand Marquis

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