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PLEASEEEEE help! I have a 2000 kia sephia when I first bought the car ( from a private seller) it ran perfect as time went on the check engine light would switch on then switch off again at random times, at that time it chugged a very small amount while I was at complete stops... I decided to get it checked and it came up as a 4 th cylinder misfire . So I then decided to change the spark plugs... After doing so my car started running HORRIBLE when trying to accelerate it backfires really bad and really loud under the hood you can hear it, i cant get up to speed until after it goes through the misfireing fits feels like its about to just die on me and going up hills I loss a lot of power, could it be the coil that's attached to the fourth cylinder that's bad I really need help pleassseeeeee

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  • Cars & Trucks Master
  • 450 Answers

First, quit begging, why did you buy this piece of s--- ? do you have a licence , donot drive this vehicle until its fixed, its dying, your kickingdead horse dude stop it, now. don't know if this can be fixed. now, timing is way out, lets keep it simple, you need the following : spark plug wires, the right spark plugs, if you have a distributor of some sort, get it a new cap and rotor, all stock items, not aftermarket . when was the last time fuel filter was changed, do it. find out where the timing needs to be, repair manual for this car by haynes . you need it. after completing all work, timimg must be checked, and set, need timing light, inductive type best, make sure plug wires are on the right spark plugs and in the distributor @ right location, see repair manual. place timing light around #1 spark plug, and also attached to battery terminals red is +, black is - , negative, knowing the timing, start engine, keep timing light wires away from fan, etc., have distributor hold down bolt loosened so you can turn it while you point the timing light towards crank damper to see timing mark, (marked w/ chalk ) timing light will flash quikly turn distributor until the correct timing is achieved, (see repair manual) for correct location of timing, when you reach this position, tighten down distributor hold down bolt, now your timing is set. Is engine running better ? NOTE: some engines need to unplug something before timing is set, (see repair manual) like the throttle position sensor, yours may be somthing else, find out which one. (repair manual) its important ! make sure all vacumn lines are in proper locations, its important, now man up and prove to me that you can do it, this can change your life, 321 goooooooooooooooooooooooooo!!!!!!!!!!!!!!!!!!!!!!!!!

Posted on Jan 15, 2013

  • Moriah powers Jan 15, 2013

    Well thanks for your help ... By the way I am a girl ! I know nothing about cars so this really helped

  • ken hane Jan 16, 2013

    sorry girl, glad I could help you, good luck !!!!!!!!!!!!1

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5 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

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Big Poppa Ma
  • 302 Answers

SOURCE: Check engine light on

There are three kinds of gasoline engine misfire scenarios, first there is the "under load" misfire and there is the "at engine idle" misfire, and finally there is misfire continuously. All engine misfires exist because one of three things has occurred. First, a cylinder has lost compression, a cylinder needs a certain amount of compression to operate correctly. Second, the ignition system has failed or is failing intermittently, spark is needed at the time of compression to ignite the fuel air mixture. Third, the fuel air mixture is incorrect, proper mixture is needed for the ignition system to ignite fuel properly. If any of these conditions occur in the engine, the engine will misfire.
1. Low or no compression can be caused by

a. burned or leaking intake or exhaust valves
b. worn or broken piston or piston rings
c. worn out camshaft
d. wrong weight motor oil was installed holding the cam followers from adjusting
e. broken valve spring
f. failed head gasket.
2. Ignition system has failed or is failing
a. spark plug has fouled or is worn out
b. ignition coil
has failed
c. spark plug wires have shorted
e. engine control module coil driver has failed
3. Fuel/Air Mixture is incorrect
a. vacuum leak at the intake manifold
b. fuel injector has failed
c. EGR valve is stuck open
d. mass air flow sensor has failed
e. oxygen sensor has failed
f. air intake boot is cracked

common problems:
1. fuel injector has failed or is failing
2. spark plug wire has shorted
3. spark plug is worn out or is cracked
4. ignition coil has failed is failing

Testing a coil on the car is pretty easy. No special tools are required. Just remember to be careful, the amount of electricity generated by your ignition system can be dangerous. If your coil is already off the car, or if you would like a more specific data-driven test, you can bench test your coil. To set up the test, remove one spark plug wire from its plug, then remove the spark plug using a spark plug socket. Next put the spark plug back into the spark plug wire. Be careful not to let anything drop into the empty spark plug hole -- very bad.

Posted on Dec 07, 2008

  • 19 Answers

SOURCE: S10 pickup misifirng when light highway load

I had to rebuild my engine at 97000 miles cuz of low engine oil pressure and bad berrings

Posted on Jan 09, 2009

  • 217 Answers

SOURCE: 1998 Cavalier No Spark in cylinders 1 & 4

ignition mod. grounds,pcm or timing belt could all be it but, I would have to look at timing first.

Posted on Jan 17, 2009

  • 1 Answer

SOURCE: Car Shakes When Driving

I had the shaking problem too, had the #5 coil replaced and the shaking instantly stopped.

Posted on Apr 22, 2009

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