Question about Mazda B4000

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My 1994 mazda b4000 idle up and down when i,m driving it

When i,m at a stop it idle down and then it idle up when i go down the road it runs ok then it start acting up a little but when i pick up speed it run find.

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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

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  • 1 Answer

SOURCE: 2003 galant wont start

Your timing belt might have busted. Mine did that in November of 2007.... I had to replace 2 of the 4 cylinders, along with the timing belt and housing. Total cost was a little over $1700.00

Posted on Jul 19, 2008

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  • 261 Answers

SOURCE: corsica stalls at stop signs

sounds like the EGR valve is sticky, take a small screw driver and tap the valve when the engine is at idle and you will notice a change in the way the engine runs, if the vehicle smooths out disconnect the valve and drive the vehicle and it should not cut off please let me know and dont forget to rate me!!

Posted on Dec 02, 2008

TheAsian
  • 93 Answers

SOURCE: Idle fluctuates

Its could be a few things. Most likely cause is you IAC (Idle air control valve) If this valve gets clogged up with carbon it will cause a idle surge on cold starts like you are describing.

Next your FITV (fast idle thermal valve). When the hot wax inside of this valve starts to wear it will cause a idle surge on cold starts.

Posted on Dec 13, 2008

timmybrown
  • 54 Answers

SOURCE: 1994 Mazda B4000 4WD V6. Check engine light on. Truck

if i remember right if the battery light and check engine light is on, your alternators may be bad. your battery may just have enough to keep it running for a minute or so. you can take it out and get it tested at a auto parts store. or try charging your battery for awhile and see if it stays on longer. if this is completely wrong let me know

Posted on Apr 08, 2009

  • 142 Answers

SOURCE: 1994 mazda cronos 2.00 v6 auto car idles ok

This sounds like a problem with the torque converter lockup system. Usually the torque converter lockup solenoid is at fault in your condition. This solenoid usually locks up the torque convertor (which acts like a clutch in an automatic transmission) when you are driving at a certain speed, and unlocks it when you press the brake, and/or come to a stop. When a torque converter stays locked up, and you stop the vehicle, it acts like a vehicle with a manual transmission, if you bring the vehicle to a complete stop without applying the clutch pedal, the brakes stall the engine. Basically, if the torque converter can't unlock, even when you come to a stop, the engine is still locked to the transmission, and even when you apply the brakes, the torque converter doesn't slip and freewheel like it should, but instead stalls the engine.

Posted on May 07, 2009

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