Question about 1999 Kia Sportage

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Missing on 2&3 cylinders i replaced coil pack and replaced plugs engine analysor says vacumm leak or egr leak any sujestions welcome

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Have you checked for vacuum leaks or have you done a compression check?

Posted on Apr 24, 2010

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I have a 92 grand am with a 2.3 dohc, I recently replaced spark plugs (3 months ago) had a miss so replaced plugs this past weekend, and coil pack, still has a miss when it sits and idles. It sometimes...


Do a Cylinder leak Down Test

You may have bad Valves

Always start with a cylinder contribution test,then
cyl leak down,to check mechanical integrety,before
you start throwing parts at other things

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I have a bad miss in a 97 4.6


If you have a code for a miss on one cylinder, it could be the fuel injector instead of the ignition. It could also be a stuck or burnt valve problem.

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2002 saturn vue cylinder 1,3,5 misfiring when swapped coil pack it went away now cyl 2,6 misfiring.


having PO 304 = Misfire cylinder 4,PO 306 = Misfire cylinder 6, as I read above you have done the most. The thing that you have missed is to check whether the Catalytic Converter is faulty or not. To get an idea check whether you have a smell like rotten eggs at the end of the exhaust,you start having problems with cat and needs replacement. My advice before you go for a cat replacement is good to visit an MOT center and check your emissions and then you decide,

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05 Ford Escape, coils #3 & #4 not firing. We've replaced the battery, spark plugs, alternator, coil packs, & pcm. Had pcm reflashed. Garage said it had to be coil packs, but just replaced coil packs 3


Check engine light on ? Code's ? What engine ? 2.3 l 4cylinder or 3.ol v-6 This vehicle has coil on plug ignition system , not coil packs ! a coil per cylinder . If new coils an still has no spark , has no B+ voltage to the coil or the PCM isn't controlling them . Without testing i'd only be guessing as to the problem .If the repair shop you had it to can only say it had to be the coils , I'd find another shop to take it to !
Autolite Coil on Plug Ignition troubleshooting

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2002 liberty 3.7 liter. I have replaced the coil, plugs and injector for cylinder #6. On cold starts I get a ramdom misfire code and engine is missing. If I re-start 3-4 times engine starts up and runs...


If you have Coil- on -Plug you haven't found the bad one yet

Your not always going to get a code that is correct
e.g.PO304,PO305 etc

I would buy the injector from you, as I'm sure that wasn't it,
unless you have an air leak around it

You want no vacuum leaks,a near new EGR Valve,no
air induction tubing leaks

Clean the MAF Sensor with CRC MAF Cleaner

Clean Throttle Plate--CRC Throttle Body Cleaner

You did put anti-sieze on those spark plugs, if not
do so.

How old are the O2 Sensors
More than 80,000 mile,replace the front 2 with OEM
Specific Make--Bosch or NGK etc and not some
cut & splice universal type

Feb 01, 2011 | 2002 Jeep Liberty

1 Answer

Truck not firing properly front coil pack not firing at all.


if this truck has an o2 sensor i would replace that and also make sure the cat-converter is not plugged,this would give you your powerloss and egr code,next is your coil,this may be caused by the computer or your crank sensor,look at the tone ring that the crank sensor uses and make sure its not missing teeth or broken,also check all your fuses.

Jun 12, 2010 | 1994 Ford Ranger Supercab

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I have a ford explorer 99 but it's giving a error code PO306 what do u think it is


It sounds like a misfire. Check spark plugs 5 and 6. It could be bad fuel, bad plug wire, or weak coil. Check the fuel injectors as well. Other possible causes could be an egr valve stuck open, vacuum leaks, low fuel pressure.

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2 Answers

Code is po300 multiple cylinder misfire. intermittent..


vacuum leaks, plugs, check the wires for corrosion on the coil packs, the 3800's are known for corroded contacts there, also a common problem is the intake gasket leaking near the egr valve, check to see if it is wet around where the egr valve enters the intake manifold, check for fuel pressure, and make sure all the sensors and vac lines are plugged in properly

Jun 20, 2009 | 2000 Buick LeSabre

1 Answer

Random misfire


sounds like the coil pack is the primary suspect here ..especially if your miss is migrating to cylinder#2 now....other issue possible...do a compression test...head gasket failure losing compression between #1 and #2 ....also..and specifically for *other user* comment... check function of EGR valve for vacuum leak into intake causing stumble misfire shudder and engine dying issues

Oct 16, 2008 | 1995 Ford Windstar

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