You can not tune the mix-ECU does this. The only way this change could cause this problem is you have "unmetered air" getting to engine. Insure all hoses are correctly installed, have no leaks, and that MAF is working right.
SOURCE: Can you give me tune up instructions for a 2003 Merc Sable wagon
try new plugs and wires and some fuel injector cleaner should make a big difference
SOURCE: 2002 mazda miata mx5 has strong gasoline smell in
The fill pipe is right back there. Check to see if a hose has been damaged. Check the spout area, is there a overflow pipe or a seam that could be leaking into the trunk?
SOURCE: 1983 Mazda RX7 lacks power rough or no idle
i have the same prob but when i do get it running at bout 70 miles per hour i boggs and wants ta die at idle when i get to a lower speed after i restart it. ive changed the fuel filter and pump n cleened the tank. when i first got the car it had no probblems. no the car will barley start n if it dose it runs fine for a minute then i loose most of the power n it wants to die when i go ta idle. HELP!!!
SOURCE: 1995 Toyota 4Runner. 4WD
I had the exact same problem and after reading all of the advice on the internet (mostly saying "bad o2 sensor") and changing out every sensor imaginable, distributor cap, rotor, spark plugs, plug wires, air flow meter, fuel injectors and harness and every other "fix" I had read about, I took it to a mechanic. $1000 later and a new valve to replace the bent one and my 4runner runs like new. Which for the sluggish 3.0 isn't saying much anyway. Point being that I probably threw 1000 bucks worth of new parts on it before I actually took it in and got the problem taken care of. Save time and money and take it to a pro or pull the engine apart and check the valves yourself.
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