Question about 2005 Mazda 3
2.0 engine with 28,000 miles
come and go problem
shakes whole car when it happens
I suspect the problem to be a ignition problem, like a plug wire or a weak coil.
Maybe fuel injector
The problem is a faulty solenoid in the vapor recovery system. The solenoid is sticking open and allowing fumes from expansion of fuel in the fuel tank to enter the air intake and smother the engine. This is how the Mazda service tech explained it to me. It is a known problem on the Mazda 3 in various trims which Mazda refuses to acknowledge. Usually the check engine light comes on and the engine diag code reads mass airflow sensor, which is incorrect. I dealt with this for 6 months on my wife's 2005 Mazda 3i before the dealership figured it out. My cousin bought a 2007 Mazda Speed 3 which developed the same problem after a few months and was cured by the same fix.
Posted on Aug 26, 2009
My daughter has a 2005 Mazda 6i 2.3L and it idled rough/stall/ shift hard fom 1st to 2nd. After replacing many parts: O2 sensors ,purge valve,3way valves, plugs, and checking all hoses and no cure I discovered on another site that the Pcv valve and hose are behind the air intake. you can get to it from underneath. It runs from the bottom of the manifold to the top and I had to **** the hose at the top to pull it off the nipple. I removed the throttle body and hose, the two shuttle valves and unbolted the starter and moved it out of the way. Lube the hose well and may need a large screw driver to help push it on and then work the clamp on. You can stand up and reach under the manifold and work it on. It is exasperating but can be done. It beats taking the whole manifold off. The old hose had a 2 and half inch **** /crack in it. It has a slip cover over it to insulate from the engine and helps seal the crack at times which explains all the erratic behavior. I thought one of the other hoses up top was the pcv but was wrong. The hose $15. Bad engineering as far as location. This cured the problem. The local Dealer told me they figured out how to do it without removing the manifold and shared the info with me.Car runs great now and shifts smoothely. This task is for shade tree mechanics that like to do this stuff. Be sure and not break the top nipple, it swivels a little and appears to be made out nylon etc.
Posted on Dec 15, 2010
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Posted on Jan 02, 2017
The ignition coil should be fine at that mileage. If spark plugs do not fix it suspect a faulty MAF sensor. If the MAF is sending a bad signal it will affect with the idle as the ecu is trying to compensate for the MAF.
Posted on Apr 23, 2009
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