What to look for in a Mazda 626?
Check the PCV hose and lines also. In addition, check the large air intake hose from the Air Flow Meter to the intake manifold for cracks and leaks. They often crack in the valleys and are hard to spot. Another good possibility is the EGR valve is stuck open or the EGR control is allowing vacuum to get to the EGR valve.
Why does my Mazda 626 shake when idling?
I’ve got a 1999 Mazda 626 that shakes really badly when idling. It gets a little better when put into neutral, but not much. I’ve had two people suggest possibilities: This started happening in the last year or so. It started out being a mild shake when stopping at a stop light, but in the past 6 months or so it’s any time the car is not moving.
How to diagnose an air leak in a Mazda?
To diagnose it is simple too, spray where the intake manifold joins the engine with a can of “jump start” or similar and if the idle picks up you have an air leak. Mazda’s are prone to fault here.
Check the PCV hose and lines also. In addition, check the large air intake hose from the Air Flow Meter to the intake manifold for cracks and leaks. They often crack in the valleys and are hard to spot. Another good possibility is the EGR valve is stuck open or the EGR control is allowing vacuum to get to the EGR valve.
What makes a Mazda 626 idle and unsteady?
Another good possibility is a bad Coolant Temperature Sensor (CTS). If it is bad, it will send a wrong signal to the computer and lean out the fuel mixture. Other possibilities are clogged, leaking or inoperative fuel injectors. Listen to each injector to see if they click.
How often should you change the air filter on a Mazda 626?
The engine air filter in your 2000 Mazda 626 cleans the air that enters your engine. You should change the filter on your 626 at least once a year or every 20,000 miles, whichever comes first. If you drive in dusty or sandy conditions, you should change your filter more frequently.