Toyota carina 2 jerking/misfiring problem :(?

S

Sprinter

New member
1985. 1.6 Petrol (4A Engine). 150k kms on the clock. Toyota Carina 2 jerks badly, engine keeps misfiring at idle, which relatively is lower when engine is cold, however, increases significantly when temperature gauge reaches the normal position. Works better at high rpms, especially when driving over 100km/h, it doesn't misfire. I have changed the following last week:
- Timing belt
- Spark plugs and cables
- Distributor head and rotor
- Ignition module
- Petrol Filter
I adjusted the ignition timing. And I visually inspected all the wires and pipes, but everything looks ok. I pulled out the ignition coil and the found the resistance between two terminals to be 2.2 Ohms, and resistance between a terminal and the third terminal on top to be over 12000 ohms, does it mean that I need to change ignition coil? According to a website resistance between two terminals should be no more than 1.7 Ohms and third terminal should be no more than 11k Ohms, but these values were not specifically for my car's coil, just general values I suppose. Its a little expensive so I wanted to be sure about it (160 euros from Toyota).
Any suggestions will be greatly appreciated. Thanks :)
 
I think your coil tested well within any error margin of any significance.
I think that you have pretty much covered the ignition system. A weak or bad coil will generally exhibit problems opposite of your description of "works better at high rpm's."
I suspect that my next move would be to perform a compression check - eliminate the possibility that this may be a mechanical concern before replacing any more parts.
Keep in mind, however, that a resistance check will not pinpoint a high voltage internal leak or high voltage arcing concern inside the coil.
 
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