You may have leaking valves, or cylinder blow by problems that are causing the oil burning problem.and THAT may be whats causing the sustained misfire, of which eventually burned up your exhaust system.a crack by itself shouldn't blink the ecu constantly, and shouldn't do anything to oil 'll just drive like shat until you get it fixed, and may throw a solid code from time to time.but flashing.you have a lot going on it seems. The bigger problem though.is possibly what caused it.I'm not sure on 98 models.but 99+ model ecu's only flash the ecu for sustained mis fire conditions.so its a p0300-304 code, meaning its misfiring non-stop.a mis fire will cause unburned gasoline to get inside of a hot exhaust pipe.in which it'll ignite there.and quickly burn up the manifold and/or catalysts.įirst.fix the crack.replace the part, have it welded, whatever.while doing this, see if the catalysts check out.chances are they are now dead too at least if you continued trying to drive with a constant misfire condition.if after the system is in check.you still get misfire problems.stop driving, you're just going to recreate the problem again.and i'd look into coils, plugs, wires, etc.to see what exactly is causing the misfire. The inspection and maintenance monitors (IM monitors) will not be reset and most all onboard computers hooked to the DLC will be able to detect that the powertrain control module is not "ready." As a result, the vehicle will fail emissions testing until the powertrain control module is in its "ready" mode, and, once it is, if the repair hasn't been made, it will retrigger the DLC and the vehicle will still fail.If your problem is ONLY a cracked exhaust shouldn't have any effect on burning oil.Ī crack in the exhaust, depending on its location, can cause some funny stuff though.the system relies on pulse vacuum to help pull burned gas out of the chambers.a leak will ruin that vacuum, causing something known as exhaust reversion.in which pressure builds up in the wrong direction around the crack.the cylinders will 'push' the burned gas out, but the pressure gradient will stall it and try to push the exhaust gas back in.causing poor driveability, ridiculous idle, and hesitation in various rpm ranges.ĭepending on where the crack is.it can also interfere with the primary o2 sensor readings.making the engine mismatch fuel requirements in light load conditions and idle.making the problem even worse. Resetting the check engine light will not allow the MPV to sneak through state inspections that require emissions testing even if not illuminated on the dash. Failure to fix the problem can lead to severe engine or transmission damage or compromise components in the emissions system. In other cases, the light will come back on after the powertrain control module has relearned and recommunicated with the sensors and modules connected to it. In addition, if the triggered DTC is a hard code, the check engine light will re-illuminate almost immediately. Simply resetting the light is not fixing the problem and in some cases, the check engine light will come back on. Resetting the check engine light in the Mazda MPV should only be performed after the DTC has been properly diagnosed and the repair has been made to resolve the problem that triggered the DTC.
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