stuttering under high load, maybe distributor? // DONE: dirty carb
Hi,
i bought K10 two months ago. During those two months i kinda got together with it, slowly discovering it's weaker spots. It has it 1.0 (988cc if i am right) engine, year 1986, approximately 218000km done (135500 miles)
I have already adjusted some minor issues (previous owner gave me another micra with 1.2 engine in good condition, but after 5 years in garage it does not start - no wonder), like changing wobbly steering bits (some kind of connecting rod between the axle and steering wheel), adjusting idle rpm, blah blah blah - not important.
Now i encountered a slightly bigger problem with the engine. Until week ago, i have been doing short trips, max dist. 50km, max speed not exceeding 90kmph and also not for long time. Last week i made longer trip, two 110 km highway drivings - avg speed 100 kmph. After that, engine is behaving strangely under heavier load. I have to give it more gas / start moving with higher rpm. If i don't, engine loses power - i believe you call it stuttering - when suddenly all 4 cylinders stop for a moment. Also when trying to accelerate harder, or simply pushing throttle down, i hear and also feel "pinging?", just like one of the cylinders drop out. Simply put, when i push the throttle down, i hear regular sound, and maybe every second or twice a second engine loses power like if i cut the ignition.
I have read this forum and found out that it could be the distributor cap and rotor. I wanted to swap both of them between 1.0 and 1.2 engines, but on my working 1.0 engine there is also vacuum advance valve, and on the 1.2 there is only electric connector. I swapped only cap, found out that the rotors have different connections.
After that, i can push the throttle as far as i want and it accelerates without any power outages. BUT, when driving in higher speeds, like 100kmph and pushing throttle down, i can hear a different sound from the exhaust once a second or so - similar to that before, but not so long -engine does not lose enough power to "ping" a lot.
Finally after this essay - i think that the problem was not only in distributor cap, but in distributors angle - bad timing. During playing with distributors and swapping parts, i dismounted it and mounted it again - i marked the position (angle), but i think i did not put it exactly there, maybe 0.25-0.5mm tolerance.
Is that stuttering under load connected with timing? Too retarded or too advanced? I read about checking the correct timing with timing light - is it possible to just fiddle with the angle and by that solve the problem? And if it is confirmed that it was timing, buying timing light and setting exact timing?
Thanks for your patience from Slovakia
Hi,
i bought K10 two months ago. During those two months i kinda got together with it, slowly discovering it's weaker spots. It has it 1.0 (988cc if i am right) engine, year 1986, approximately 218000km done (135500 miles)
I have already adjusted some minor issues (previous owner gave me another micra with 1.2 engine in good condition, but after 5 years in garage it does not start - no wonder), like changing wobbly steering bits (some kind of connecting rod between the axle and steering wheel), adjusting idle rpm, blah blah blah - not important.
Now i encountered a slightly bigger problem with the engine. Until week ago, i have been doing short trips, max dist. 50km, max speed not exceeding 90kmph and also not for long time. Last week i made longer trip, two 110 km highway drivings - avg speed 100 kmph. After that, engine is behaving strangely under heavier load. I have to give it more gas / start moving with higher rpm. If i don't, engine loses power - i believe you call it stuttering - when suddenly all 4 cylinders stop for a moment. Also when trying to accelerate harder, or simply pushing throttle down, i hear and also feel "pinging?", just like one of the cylinders drop out. Simply put, when i push the throttle down, i hear regular sound, and maybe every second or twice a second engine loses power like if i cut the ignition.
I have read this forum and found out that it could be the distributor cap and rotor. I wanted to swap both of them between 1.0 and 1.2 engines, but on my working 1.0 engine there is also vacuum advance valve, and on the 1.2 there is only electric connector. I swapped only cap, found out that the rotors have different connections.
After that, i can push the throttle as far as i want and it accelerates without any power outages. BUT, when driving in higher speeds, like 100kmph and pushing throttle down, i can hear a different sound from the exhaust once a second or so - similar to that before, but not so long -engine does not lose enough power to "ping" a lot.
Finally after this essay - i think that the problem was not only in distributor cap, but in distributors angle - bad timing. During playing with distributors and swapping parts, i dismounted it and mounted it again - i marked the position (angle), but i think i did not put it exactly there, maybe 0.25-0.5mm tolerance.
Is that stuttering under load connected with timing? Too retarded or too advanced? I read about checking the correct timing with timing light - is it possible to just fiddle with the angle and by that solve the problem? And if it is confirmed that it was timing, buying timing light and setting exact timing?
Thanks for your patience from Slovakia
