Question about 1996 Kia Sportage

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My matiz jerks on the road.the engine revs freely when stood with no misfiring,the plugs n ht leads have been changed and the dizzy cap n rotor arm look ok, any ideas ? Dave

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  • 18 Answers

May be fuel pump if it only does under a load

Posted on Jul 19, 2009

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Engine runs at idle all plugs fire, but when the engine is throttled is starts to miss and runs rough if i put a strob light on the ht wires you can see the miss fire on all the leads


If you can see electrical sparks across the ht leads then you may have a tracking/shorting problem somewhere.

You haven't said what vehicle you have, but a rotor arm or distributor cap can crack and cause the problem you describe. As can a coil/ignition pack and of course, the leads themselves.

There's no real way of testing ht leads apart from replacing them. The same applies to a rotor cap and rotor arm.

Check inside your rotor cap - if you - can - look for 'tracking' marks... burning. Try cleaning it and spray everything with an ignition sealant to see if that eases the problem.

However, replacement - if you suspect any of these items to be at fault - is the only real answer


ignition sealant Google Search

Mar 12, 2016 | Cars & Trucks

2 Answers

My '97 Jeep Grand Cherokee ltd 6 cylinder is giving me fits right now. It stalls backfires losing speed while driving down road then if I pull over and turn off and on sometimes it will be okay. What could...


When was the last time you tuned up your Jeep? Spark plugs, cap and rotor can certainly attribute to if not cause the problem you are describing. Definitely sounds like a fuel problem (too much fuel being dumped in the cylinders.)

Jul 01, 2010 | 1997 Jeep Grand Cherokee

1 Answer

My 1990 sierra has a miss in it when i accelarate. I replaced plugs and wires but not the fuel filter or fuel pump.I also smell fuel outside between the bed and cab on the drivers side


Check out the distributor cap and rotor arm, - and make sure the plugs ar gapped properly - should be 1mm on 1.6 1.8, and 0.75mm on the 2 liter.
Check the oil level urgently, if it has been misfiring for some time you will have acuumulated all that unburnt petrol in the oil sump!!! (you can test this by getting a bit of oil from the dipstick and putting a drop on your fingers, rub together and sniff the oil, if it stinks of petrol change it -you need to change the oil filter too since it wil be full of petrol tainted oil also.
Once you are sure you have good oil and either it was ok after testing it from the distick "golden, clean oil" or you replaced the contaminated oil and filter you can move on to sorting out this misfire.
- You didn't mention if you checked or replaced the HT coil - Check for strong sparking from the main HT lead from the coil itslelf, Pull the lead from the centre of the distibutor cap - have someone crank the engine while there is a "spare" sparkplug in the main ht lead (ground the plug to the engine, holding the rubber insulation of the cable with pliers - Use a normal HT lead if the main coil lead wont reach a suitable grounding point with the sparkplug) - check for solid bright blue spark, it should be regular timed, and strong EVERY time - any missing or weak sparks indicate electrical problem either - the coil is failing - or the battery is weak - or the distributor is faulty. - a faulty distributor would be expensive to replace and more so to repair, a reconditioned distributor costs around £120.
for now I assume the coil checked out fine and gave a strong steady uniform set of sparks. ----------------------- With a fully functioning coil, you're left with the distributor cap and rotor arm - the distributor cap comes off with 2 screws at the left and right sides of the cap between the HT Connectors - unscrew them - (note the original orientation of the distributor cap before you pull it off to aid refitting) you can now pull away the cap from the rest of the distributor.
INSIDE the CAP there are four "poles" round the outside, and a spring mounted contact in the center - make sure the poles are clean and shiny with only light markings at most, if they are blackened, whitened ro rounded and pitted then replace the cap - ford dealers or local part shop, most shops will stock both the rotor arm and distributor cap for around £15-30 - phone around for the best deal.
Still on the distributor is the rotor arm, this pulls off - it has to be pulled dead straight off the distributor shaft - once you have the rotor arm off you can inspect the metal contact on the top for general dirtiness and decay, it "should" be shiny brass/copper in colour. if it looks pretty bad, pitted or blackened/burned- - get a new rotor arm from ford dealers or from local part shop (not expensive)
Once you are sure of a clean or new rotor arm and distributor cap you can try the engine again - hopefully the misfire is gone.
If it is still there....
we are here

DISTRIBUTOR CAP - FINE ROTOR ARM - FINE OIL + FILTER NOT OVER LEVEL + CLEAN, NO PETROL IN IT HT COIL - GOOD STRONG REGULAR SPARK. -----

If it still misfires with all these things in perfect order then you are left with: Clogged Fuel Line/Filter or Failing Fuel Pump or Ignition TIMING - ( 10-12 degrees BTDC) have igition timing checked and set if not correct. OR... Faulty Distributor - pretty much worst case scenario. Tell me how you get on - Often it is the distributor cap and rotor arm - If not I hope its the fuel filter!
Good luck,

Jan 22, 2010 | 1990 GMC Sierra

2 Answers

Vw polo 97 1.4 missing on 1 cylinder, checked the basics, plugs n leads, dizzy cap n rotor arm hasnt made any difference. can u help?


have you isolated which cylinder is misfiring?
either way I would have a compression test done .. to find out which cyl is not firing pull 1 spark plug lead off at a time until you get the one that makes no difference

Aug 20, 2009 | 1997 Volkswagen Golf

2 Answers

99 Ram 1500 #5, 6, & 7 Misfire


Replace the oxigen sensor and the cat.If its not eusing oil then i dont think your engine needs to be replaced.Also check your air filter is not dirty and add some injector cleaner.to the fuel.Good luck hope that was helpfull.

Aug 01, 2009 | 2001 Dodge Dakota

1 Answer

Jerking matiz


mass air meter

Jul 19, 2009 | 1996 Kia Sportage

1 Answer

Clio 1.8 16v L reg misfire


oxygen sensor is your problem.

May 19, 2009 | 2005 Renault 181

1 Answer

1988 mercedes 190 1.8 litre will not rev over 2000rpm


hi, have you checked the cap and rotor arm, sometimes the spark will track back to the h/t instead of going to the lug in the cap hence a misfire also the rotor can have a hairline crack producing the same symptom check both for cracks, this may be the problem hope this helps

Jan 22, 2009 | 1988 Mercedes-Benz 190

1 Answer

The car's movement is low


The engine can run sluggish if the timing is wrong or is poorly maintained. I would suggest changing the spark plugs, check the ignition leads, rotor arm and dizzy cap, also check the timing and don't forget the test lead as discribed in the haynes manual for checking your timing. The sparkplugs will indicate this and also you would get pinking from the engine.

Jan 02, 2009 | 1996 Toyota Corolla

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