Need Help: Rough Idling, Hard Acceleration & Car Shaking Like Hell
 

Done :

1. ghetto compression test
2. ignition coil
3. igniter
4. vacuum/hose leak
5. fuel pump

could it be :

1. AVC & PCV problem?
2. water leaks to housing?
3. carb problem?

it's 1982 S2, 12A
will post the video later

did you do the fuel filter too?

fuel filter is a prime suspect. also inspect the plugs for wear and corrosion. check the resistance of each plug wire and ensure they aren't arching. if what we've both mentioned is checked properly, including compression, its time for a carb rebuild.

Check dizzy cap and rotor condition, too.

Possibly bad fuel as well, water etc. in tank.

What was the result of the ghetto compression test? While the engine is idling, pull 1 plug wire off at a time and note any changes in idle. If you find 1 wire that doesn't change the idle, inspect all of that part of the ignition system from the plug back to the dizzy rotor.

Both replaced with new one. Any chance the pickup coil got problem? when i crank there are sparks at both T & L plugs, but i'm not sure if it is adequate enough to burn the fuel.

actually i just had the same problem with my car.. 79 (not sure what kind) 13B.. it had REALLY bad gas in it.. check ur spark plugs if they are falled then replace them and get a can or 2 of this stuff called SeaFoam.. works greak.. add about 6 gal of gas... should burn pretty well.. if it still idls funny.. replace the fuel filter...(might be 2 on ur car there is on mine) thats my suggestion

I got strong pulses from both rotors. I remember last week i've done that but forgot to note which plugs changes the idle when unplugged.

Spark plugs seems fine, but not sure it had correct timings. i believe Seafoam only sold in US & Canada, not in my country (asia region), the best i have is MMO, i don't know if it is a substitute for seafoam. have stock it a lot since i realized that the MOP malfunction (few mths after i bought it from ex-owner + some searches in the forum).

Might be. I remember in the early 80's we only have RON87 & RON91 for our cars here. not sure which fuel is better as i stick with RON87 fuel.

Last year the radiator fins corroded & gone bad, i send it to the radiator shop to recore with new 3 row type. My mistake is i don't replace the water pump that time (coz of tight budget). Everytime i run 140km/h+ the engine temp starting to rise from normal temp to 110-130 degree celsius. Well engine overheat is bad for rotaries, but hopefully this is not in my case.

Check your fuel filter first and foremost. It's a cheap and easy fix if it's the problem and just good maintenance even if it isn't the problem. The stock filters can clog up quickly and your symptoms sound like a clogged filter.

Sorry guys for my bad english. I'm not that good in english. Hopefully you all understand the words i type here.

Will do it ASAP. FYI, every time i filled in the gas i always mixed it with MMO or 2 stroke oil in the tank. I hope those MMO/2T oil is the reason the fuel filter clog up. I got no other way to run premix except by filling it in the tank.

Just replaced the fuel filter, still no improvement. it must be something else.

today i got chance to drive the car, max speed 100km @around 2500rpm for about 70km destination, water temp rise to 110 degree celsius which is not normal, coolant reservoir drying up (i filled up the radiator & reservoir before i drive).

possibility :

worn out water pump & inadequate air sucks to the intake which leads to carburetor Air/Fuel mixture problem (time to rebuild)?

bump anyone?

nevermind, the rear rotor lost compression today. thanks for the help & suggestions.