Question about 1985 Toyota Corolla 2 Door

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Actual timing would depend on what engine is installed in the 1985 Corolla. There are some versions that uses the 4A-GE, 4A-GEC, 4A-C engines. There are even some Asian versions that used the 4K/B engines.

The correct method would be to use timing light, engine analyzer and some other test equipment, However, below is a quick and dirty procedure. Basically, to adjust the distributor timing, you need to:
1. make sure cylinder 1's piston is at firing position/TDC (top dead center);
2. crankshaft pulley's timing mark is between the markings on the engine with numbers on them;
3. unplug the rubber boot of the high tension wire for #1 cylinder;
4. connect to it a spare known good spark plug and allow to touch any metal surface of the engine;
5. slightly loosen the single locking bolt of the distributor stem;
6. turn ignition key to ON but not start;
7. carefully swing the distributor assembly till there is spark in the exposed spark plug;
8. tighten locking bolt.

You may need to readjust the distributor for highest idling RPM with the engine running by simply turning the entire distributor assy.

The timing mark must coincide with the specified advance for whatever engine is used by the Corolla. 8 degrees would be a fair start.

Extreme care when working with engine running; extremely high voltage at the high tension wires, distributor and ignition coil and the fan/belt has been known to catch loose clothing.

Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.

Good luck and kind regards.

Thank you for using FixYa.

Posted on Jul 09, 2008

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I need to lnow if the distributor of a 4a-GE will fit a 4a-GEC, is this engines use the same me at

Posted on Jun 01, 2009



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Hi, I need to set the timing on my 1988 3F engine on a Land Cruiser but when I move the distributor, either I ****** or advance my idle, so, or you please tell me how to set the idle after I set (moving...

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now that the timing is correct then adjust the idle speed at the idle screw on the carby

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This sounds like the oil seal on the distributor needs replacing. I have not got the the timimg details but you can set it up this way until you can get the specs.

  1. Set the rotor arm to No 1 cylinder.
  2. Now mark this on the distributor.
  3. Mark the bottom of the distributor and the housing (inline with each other).
  4. Now put the car in gear and do not turn the engine.
  5. Check your timing marks on both your cam and crank shafts.
  6. Take out the distribuor and replace the the worn seal.
  7. Put back the distributor while lining up all the alinement marks that you have made.
  8. Now nip up the the distributor but do not full tighten it.
  9. Check your alinement marks, take the car out of gear and start the engine.
  10. If the engine is not running correctly, you can increase or decrease the engine speed by moving the distributor slightly to the left or right.
  11. When you have the engine tick over speed to your liking you can stop the engine and and tighten up the distributor.
Following these instructions you should be only a few degrees out at the most.
When you get the the correct timing information you can use a timing light to rset up the ignition timing.


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How to set timing on toyota corolla 1.6 engine 4ac?

First the timing is easier to set with that big metal thing removed on the side of the engine. Next I set the No# 1 cylinder to TDC. If you remove the cap to the distributor it helps. They are 8mm bolts three of them.

Pull the plug and insert a platstic straw in the No 1 cylinder When it stops going completly up its at TDC I set it to 10 degrees BTDC by watching the marks on the front cranshaft pulley Never turn the engine backwards the timing belt cold come off. Sometimes its easier to remove the other plugs and turn it by hand.

Next remove the distributor Yes completly, not just the cap. Look at the 4 poles or tabs on the shaft inside the distributor and notice how they align up to the stationary pick up pole inside the distributor as the rotor shaft rotates. Put the rotor part on the shaft, and mark the spot when the rotor is pointing to the No1 spark plug wire position as it passes one of these poles This is your new timing mark.

Now put the distributor back in so the rotor is pointing to the No 1 postion or this mark. You now have a timing of 10 degrees BTDC or where ever the crank was set.

Tip: As the distributor goes in it will turn one way as it engages the gear So yu must lead the mark when you go to put the ditributor in by turning the shaft off your mark.

The distributor will rotate too, so you can align the timing mark you made on the distributor to the rotor shaft. I use white paint applied with a small touch up brush for my mark.

Also your mount bolt should fit in the slot cut in the bottom of the distributor to tighten it in place.

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