4g93 jerking..

[devalian]

hi guys,

im driving wira 1.6 with 4g93.

for like last 2 months, my car suddenly got jerking. its ok when im driving 60kph and above or rather 2k rpm and above.

then i went to change my spark plug for some generic denso. it was fixed! (that is what i thought).
no more jerking, but it last only 1week +. then the problem revisit.

when i go for regular service (engine oil n oil filter), i ask the mechanic to check. apparently the newly changed spark plug covered with oil, he claimed it was engine oil. i was wondering is it petrol mixture or engine oil?
he clean it and dry it for me. then the car is ok for a few days.

as u can guess, my car is still jerking now.

but the thing i found it weird is, if i always drive on highway, nothing occur. i pour some fuel enhancer into fuel tank to try, it was ok for a while, then problem again.

the best thing is, if i off my Aircond compressor (blower still on), the car got no jerk AT ALL. haizz
but if it is compressor problem, wth will the spark plug covered with engine oil?

if injection problem, why if i off compressor, then the car ok. :hmmmm:

for service record, i top overhaul my engine last year, changed radiator, radiator cap, air filter, spark plug, spark plug cable, clean TB, reset ECU (unplug battery), alternator.

is that really compressor kong? or distributor or fuel injection problem?

anyway, my wira is about 10 years old like tat. mileage 220k now.

 

[SkYwAlKeR]

what about engine oil level??... did it decreased after sometime??... any visible smoke emitting from ur exhaust system??...

from ur diagnosis above, i presume it could be piston ring... since u've done top overhaul last year and i assume ur mechanic did it correctly without messing anything, ur valve seal should still be good...

if... ur sparkplug is covered with petrol and not engine oil, check ur ignition system... distributor, coil, etc...

 

[devalian]

what about engine oil level??... did it decreased after sometime??... any visible smoke emitting from ur exhaust system??...

from ur diagnosis above, i presume it could be piston ring... since u've done top overhaul last year and i assume ur mechanic did it correctly without messing anything, ur valve seal should still be good...

if... ur sparkplug is covered with petrol and not engine oil, check ur ignition system... distributor, coil, etc...

engine oil level jz decrease little bit, now just a bit under the maximum line, est 2-3mm lower after 1k+ of mileage. 10-40w.

hmm, no smoke from exhaust tho.

yeah, i did think of piston ring as well. last time top overhaul also due to 1 piston of the right most stopped moving. maybe its time for it already.

i will open up and check the spark plug again soon tho.

 

[DanzEterna]

suspect is the coil plug....go for MUT scan bro.