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A lean mixture can cause jerking because there may not be enough fuel in the cylinders to fire. And it may be inconsistent as well. Even worse, lean fuel mixture could cause more damage (detonation, blown head gasket...etc) If it was a plugged fuel filter, it would more likely happen under high...

Be cautious about too low PSI. Remember the Firestone debacle on Fords back in the day? I believe low tire pressures specified by Ford contributed to overheating the tires and tread failure.

It's fairly common these days for accessory mode to remain active for a period of time after shutting vehicle off and then all power shuts down when a door is opened. My wife's 09 CX9 would beep a few times when you got out of the vehicle with the key on you, but still running or in run mode...

First, what is he replacing for $4k-$5k in exhaust work? Second, non-OEM parts should have not cause any issues, as long as they meet the requirements.

How are your air conditioning drains? My wife's CX9 had a plugged drain and you could hear water sloshing around. I used a bit of compressed air (one of those pump up sprayers without any liquid) and gave it a quick blast. I bet at least a quart or more came out.

You might have a good case now. Last year you were at 1/2 qt every 7k miles, now you're at 1+qt every 3k miles. That's a 4x increase in less than a year.

Is it the same as OP posted in 2019? https://mazdas247.com/forum/t/weird-noise-coming-from-engine-or-what-is-it.123869210/

If you have an Android phone/tablet, you can pay for the Torque App ($5) and you can real time monitor a lot of things. There's a free version, but I know I had to go with the pay version in order to see the misfire.

Can you explain the shudder? When does it happen? Is it repeatable? My wife's 09 CX9 had a pretty bad shudder when on freeway, medium/heavy throttle when torque converter was locked. I thought it was the transmission but turned out to be a misfire. I bought a cheap bluetooth OBDII reader and...

The knocking is a concern. You'd have to tear into it to get a better idea of what's bad. You could get lucky and swap the pump, add new oil (couple short interval changes) and have it be fine, but most likely going to be more severe damage based on the knocking comment.

I agree with jal142, head gaskets are not a common issue with these engines. Curious, how many miles are on it? As for which brand, I'd be cautious about the cheap brands. If you can swing the extra cost, get the Cloyes or even official Mazda (which is likely made by a name brand company).

If the engine temp was only around 200F, likely not hot enough to trigger fans to turn on, however, at 200F, the thermostat should be at least partially open, so you'll have coolant circulating and pushing air out. You could try to burp it again, it wouldn't hurt. I know with my 14 Explorer, I...

You could throw a few bucks at a new water pump before putting the new/used engine in. Should be less expensive since it's out of the car. That should give you a bit more time before you start to worry about it. For reference, my wife had an 09 CX9 with internal water pump. Never had any issues...

Just to confirm, it's doing the rev limit of 3500 in park or neutral, correct? If so, that might be normal. AKA a 'soft limiter' is fairly common these days (even back to 2008). We don't have my wife's cx9 anymore, so maybe someone else has one to try a neutral/park rev test. I agree with...

If the CX5 is like most vehicles, turning the temp up doesn't really help the evaporator dry out. The heater core is after the evaporator. All you need to do is turn off the A/C and make sure you aren't in defrost or foot only modes as those run the A/C (temperature permitting). Just set the...

I don't have a CX9, but I have a USB microSD adapter with a 16gb micro SD for my music and it works fine. As youri said, it just sees it as a USB, should work on the CX9 as well. It was something like $10 from Amazon.

Take alternator out and bring to a parts store that tests them. If you have the old alternator, you could bring that as well.

Just a general comment on the wipers, my previous VW Golf and my current Ford Edge both require wipers to be in service position to lift them otherwise they hit the hood. My Golf had to do similar 'electronically' put in service position. My Edge, I can actually just manually rotate the wiper...

(sarcasm) But I don't want the gubberment to know who/where I am or what I'm doing......Typed on my cell phone. :) (end sarcasm).

I agree lug nuts first thing to check. My coworker just went through loose (and missing) lug nuts last week. He had new struts put on and after about a week a bad vibration developed. He thought it might be the struts, but I told him to check wheel lugs first. One front wheel was missing 3 of...