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Mazda 626 1999. The problem is that the car idle is 1250 rpm and I turn the a/c and run at 750rpm and has a misfire or at least start shaking bad .just on stoplight or stop sign other that runs good but Rpm are high check engine turn on with p1131 code .another thing is I smell strong odor exhaust smoke . Any person can help me with this matter. Timming was done. Head rectificate and tune up. But still the problem.

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Well the code p1131 is the oxygen sensor . its one of the ones in front of the catalytic convertor ... now the reason it has the strong odor is the o2 sensor is telling the car that you have to much gas so when you get to a stop sign or red light it doesn't have enough to run all the cylinders change the o2 sensor and put a little fuel treatment in it like seafoam ...

Posted on May 09, 2014

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The code refers to the Heated Oxygen Sensor (upstream) this would account for the high revs at idle as the fuel/air ratio is weak so the ecu is try to keep engine running ,you could try a fuel addative that is specifically designed for the catalytic converter as well as the valves etc as this will clear any carbon deposits that have built up on the sensor as well ,follow the manufacturer instructions on the product you choose

Posted on May 09, 2014

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SOURCE: 1993 Mazda Mx3 Revving high/Fluctuating during idle.

there is either a vacuum leak,or a valve on the throttle body called an iac that is bad. it is the idle air controller.alot of mazda have that problem

Posted on Oct 23, 2009

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SOURCE: engine idle incorrect nearly stalls runs on 3 cyl on low rpm

Best way is to get the fault codes read using a £15 interface cable and VAG-com software (£free) on a laptop computer. It will save you money. In the meantime, have you removed and examined the spark plugs?
Hope this helps you a bit. If it does, a "Fixya" rating would be much appreciated. If it doesn't
help you, I'd be grateful if you didn't bother with a rating at present - they can't be increased later if I do manage to solve your problem! Just come back and tell me what you found. Cheers, D

Posted on Dec 03, 2008

  • 1 Answer

SOURCE: Engine vibrates, shakes car at 1700 rpm, smooth at 2000 rpm

Something similar happened to my van, and it ended up being that I needed to replace a tie rod in one of my wheels. Hope this helps! I know this was posted awhile ago.

Posted on Dec 28, 2008

ourhowse
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SOURCE: 1998 toyota corolla shakes before 2 rpm, check engine lights up

Not sure what is causing it, but it sounds like you're running on 3 cyllinders. Check plugs, wires, timing . timing belt may have jumped, bad injector, low fuel pressure.

Posted on May 13, 2009

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SOURCE: Chevy 3500 Express truck. fuel problem?

IF YOU GOT CYLINDER MISFIRE.OR OPEN FUEL INJECTOR.THAT WILL CAUSE THE PCM TO ENRICHEN FUEL MIXTURE.TO ADJUST TO DEAD CYLINDER.WHICH ACT AS A LARGE VACUUM LEAK.THATS WHY YOUR EXHAUST TAIL PIPES HAS A RAW FUEL SMELL AND WHITE SMOKES.

Posted on Sep 03, 2009

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1 Answer

Shaking during idle when warm.


try injector cleaner or newer fuel cleaners, try octane booster, sounds like a fuel delivery symptom but the temperature factor is a worry. I would guess injectors.

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Hellow i changed spark plugs " gas filter . and the motor keeps on shaking. rpm shows less than 1000 rpm how to adjust the rpm ???? please help thank you very much


The first thing i would od here is to go to an atuo parts stor and have the computer scanned to see if there are any stored codes that may help in finding the problem. the computer will store a code when it sees the engine not operating they way it should. there are many auto part stores that scan for free and give you the codes.

If this was caused by a misfire due to a bad coil then the computer should of turnned on the check engine light. try cleaning the throthlebody with a toth brush and some throtlebody cleaner, this sounds like the idle is not being controlled to specs. it is lower than normal. this may be caused by a dirty throtlebody or bad idle air control valve.

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