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Hello people, problem is it “jerks” intermittently, feels like a misfire to me but have changed spark plugs, rotor/dist cap, ignition coil (there is only 1). Can be driven for 30Km without problems, other times you get that jerk feel 3-20 times in a 30km run.No problem at idle, no trouble code, mechanic has no further ideas and sort of gave up, and i can’t just be throwing parts at it. Yeah it was low on coolant at one point, no overheat problems or so, i topped it off.Ideas?
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start with a power balance test do the test in the video.
http://www.youtube.com/watch?v=bAOmUjAj … plpp_video
Quoted From EricTheCarGuy:
Is it an automatic or manual?
It’s a manual, so that’s not the problem. I dunno about the power balance test, it runs fine on idle and most of the time on the road, but it’s going into another shop tomorrow, ill see what they have to say.
Fuel filter was changed also, and for some reason the valve cover gasket.If it’s a manual then it may be a problem with the clutch, if you don’t find a performance issue with the engine it’s probably not a bad idea to check the clutch operation.
Quoted From EricTheCarGuy:
If it’s a manual then it may be a problem with the clutch, if you don’t find a performance issue with the engine it’s probably not a bad idea to check the clutch operation.
Checked the video, definately not a clutch problem, it has none of that slipping when changing gears, and if i would lift up with a gear in it would either take off or stall for sure.
It’s more of a very rapid jerk/misfire, split second and then back to normal, but now it’s been going for almost 200km without one single incident.
The kia place i went to didn’t even think it was worth taking a look at, suggested i come back if the check engine light came on or it was happening ALL the time, basically no check engine light and rare intermittent problem = many many expensive hours to find the problem (at ~200 USD an hour, 1500 SEK).I would look to the ignition system then, here’s a video that might help you with that.
http://www.youtube.com/watch?v=x-U9WqJfaJsQuoted From harryseaword:
Checked the video, definately not a clutch problem, it has none of that slipping when changing gears, and if i would lift up with a gear in it would either take off or stall for sure.
It’s more of a very rapid jerk/misfire, split second and then back to normal, but now it’s been going for almost 200km without one single incident.
The kia place i went to didn’t even think it was worth taking a look at, suggested i come back if the check engine light came on or it was happening ALL the time, basically no check engine light and rare intermittent problem = many many expensive hours to find the problem (at ~200 USD an hour, 1500 SEK).Ok, if it is jerking, slipping is the opposite of jerking. So maybe your car is just programmed to shift hard under certain driving conditions. It can also be the way you drive. Cars have adaptive learning technology where it is constantly changing the way it responds to the drivers style of driving. Also, jerking doesn’t always point towards a misfire.
Quoted From EndSupremacy:
Ok, if it is jerking, slipping is the opposite of jerking. So maybe your car is just programmed to shift hard under certain driving conditions. It can also be the way you drive. Cars have adaptive learning technology where it is constantly changing the way it responds to the drivers style of driving. Also, jerking doesn’t always point towards a misfire.
The vehicle in question is a manual trans unless this vehicle has a dual clutch transmission, the OP will be manually shifting through the gears.
Other than looking at ignition related components, did you check your clutch pedal free play? Does the ‘jerking’ go away if the slowly depress the clutch?
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