1991 Toyota Corolla distibutor

Depends on how accurate your multimeter is. Most are accurate +/- 2%.
I would check ignition timing and make sure you have no vaccum leaks. Ckeck the plugs for problems. I would also clean the throttle body check the PCV valve and EGR (if equipped).

Might be a good time for a tune up, plugs, wires, cap rotor, PCV valve, air filter. If your timing belt has more than 60K miles, it needs to be changed.

From: ted01220
To: rasmataz
Posted: Sat May 10, 2008 1:02 pm
Subject: 1991 corolla

i did a diagnostic check on this engine, where you install a jumper and count the number of flashes that you get on the chck engine light. Had one flash, pause, two flashes, manual says it is a code 12. RPM signal, can this cause the same problems?

Check the ignition timing by jumping Te-1 to E-1 should read 10deg BTDC.

The knocking could be caused by the distributor or knock sensor not retarding the timing and creating spark knock/detonation

You're missing the Ne signal to the ECU which represent RPM signal-Test the pick up coils in the distributor-the fix here if the wires are good to the computer-distributor must be replaced