Question about Kia Spectra

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VEH. RUNS FINE AT IDLEBUT WILL DIE OR TRY TO DIE WHEN GIVING IT GAS. AT ONE POINT I DID GET A MISFIRE CODE IN CYL. 1 & 4. CLEARED CODES. REPLACED PLUGS , COILS AND WIRES SAME PROBLEM. CHECKED TIMING,FUEL PRESSUR,COMPRESSION ,INTAKE LEAKS AND MISC. OTHER THINGS.PLEASE HELP !

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You havent stated year but look on the inlet manifold somewhere ?????? their could be a idle control valve and how it operates is it allows aiir into manifold engine side of buterfly ,this valve is stuck or gummed up or just not working .try it first and if no joy then put it into a local garage is the best i can suggest as these things can be tricky for a non professional to sort out even for someone like me with 40+ yrs experiance and i learn new things every day with these fancy electronics on modern vehicles

Posted on May 17, 2011

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It has a 3800 cu engine and the upper intake blew up.I have replaced several parts it does not idle like it should.


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Cylinder 1 misfire detectedrich or lean air/fuel mixture fuel injecter fault and faulty crank shaft sensor


Wow... Thats a lot of diagnostic codes. First... The cyl #1 misfire will cause the Engine to run rich giving you a rich running engine. Therefore the rich lean code. This misfire on cyl #1 can also throw a crankshaft sensor code as it will slow down engine rpm. I would change the spark plug and ignition coil to cyl#1 and have the codes erased and see if that solves the problem. If not, you then need to persue any codes that may reappear.

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I have a Ford Escort 2000 year model. It has a very poor idle. I checked the codes and it showed p0171 p0304 and p1131. I replaced the plugs, wires and the throttle position sensor. The car drove...


The PO 304 ---is a misfire code for cyl #3, just a code

The PO 353 --- is a misfire code for cyl#3 that refers you
to PO 350 which is an undetermined Primary or Secondary
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The PO171 -is a Lean O2 Code for Bank 1 most likely from
a misfire yet to be determined

The PO 1131 ---Lack of Switching ,lean trying to correct
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Personally I think anyone that uses 10 oz of anything,
in an 16 to 18 gallon fuel tank is wasting their money
There has never been any mfg recommend injector cleaner
In a ford they say not to use it,as it will damage the pintel coating,
which I doubt,still useless product

Did you clean the MAF Sensor

Continue to check for leaks,including
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I would scope the O2 Sensors,you won't have
a scope & I don't care for a meter, as you don't
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At 100,000 miles, change the ones closest to the engine

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Do all your egr & coil testing on a hot day & up hills,
easy on the gas to load the engine some

The misfire codes you get on a ford are only correct about
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You may have to walk 1 new coil until you get to the bad one

Your real issue is the idle problem
Check all vacuum items
Be nice if you could Smoke Test everything
& end that exercise

Check the cam timing before you spend days
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You could use a scanner to look at data,don't know if
you know anyone with one at work

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I was having the same problem changed plugs, plug wires, coil packs, cat converter and had injectors flushed....cost quite a bit and nothing fixed the problem. Over 1000.00 spent before changing the injectors and this fixed the problem perfect. My truck now runs like new and I hope to get another 185,000 miles out of it......have the injectors checked and use "seafoam"....good luck

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2003 Hyundai Sonata with 4 cyl. PO301 error code. Have replaced spark plugs, wires, coil packs, and mass air flow sensor. Replaced air filter due to heavy gas smell. Car was starting after tapping gas 3...


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Possible Causes:
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- Insufficient compression at cylinder #1
- Incorrect fuel pressure
- The injector circuit is open or shorted at cylinder #1
- Fuel injector #1 may be faulty
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Possible Solutions:
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- Replaced Spark Plug #1
- Replaced Injector #1
- Replaced Ignition Coil #1

Being you have a heavy gas smell I would look into the injectors. If injector #1 is over producing it can cause a misfire. Test your compression and fuel pressure.

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1 Answer

BMW Z3 rough idle on start codes read P1189 , P0173


all the codes you have are all related to the fuel trim, this problem needs to be looked at with a european capable scanner for futher tests sorry.

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