Distributor timing question

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Dumindu
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My tercel:: 1987 Toyota tercle 4wd DX Wagon 1452CC
Location: Sri Lanka
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Distributor timing question

Post by Dumindu » Thu Feb 28, 2019 8:47 pm

My car is a Toyota Tercel 1987 4WD 1452CC DX Wagon with a 3A engine.

When get engine the timing from the distributor I have a question to identify the correct point by the ear.

When rotating the distributor cup clockwise and anti-clockwise (Advance and Retard directions) at the ends there are labour sounds and in-between pinging sound peak at the middle.

I have heard that correct timing point is 1-2 degrees retarded to the peak pinging.

Is it correct? or is there any other way to set timing with ear?

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Petros
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My tercel:: '84 Tercel4wd w/extensive mods
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Re: Distributor timing question

Post by Petros » Thu Feb 28, 2019 10:20 pm

the best timing, to get the most power and the highest fuel economy, is where you get the most advance you can, WITHOUT audible ping or engine knock.

the worst condition for ping is a max acceleration on a warm day, engine fully warm. you have to make several attempts, you set it, than accelerated hard (preferably up hill), and listen for ping or knock. you advance it until you get the ping on acceleration, than back it off a few degrees.

outside air temperature, quality and octane rating of the gasoline, will affect how much advance you can have without ping. so if those vary, you can expect to have reset it. Prolonged ping is harmful, could cause head gasket failure, or piston crown failure.
'87 Tercel 4wd SR5 (current engine swap project)
'84 Tercel 4wd (daily driver, with on going mods)
'92 Mazda MPV 4wd (wife's daily driver)
'85 Tercel 4wd DLX auto(daughter's daily driver)
'01 Honda Civic (other daughter's daily driver)

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Dumindu
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Posts: 202
Joined: Wed Aug 02, 2017 12:34 pm
My tercel:: 1987 Toyota tercle 4wd DX Wagon 1452CC
Location: Sri Lanka
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Re: Distributor timing question

Post by Dumindu » Fri Mar 01, 2019 7:40 am

Thank you very much

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Dumindu
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Posts: 202
Joined: Wed Aug 02, 2017 12:34 pm
My tercel:: 1987 Toyota tercle 4wd DX Wagon 1452CC
Location: Sri Lanka
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Re: Distributor timing question

Post by Dumindu » Sat Mar 02, 2019 3:20 am

Sorry. Does that means by ? :

Remove the lock-nut and rotate the distributor cup anti-clockwise as much as the nut hole can be seen. Then start rotating the distributor cup Clockwise until engine sound start to increase. Then stop the rotation and rotate it back for few degrees.

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Petros
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My tercel:: '84 Tercel4wd w/extensive mods
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Re: Distributor timing question

Post by Petros » Mon Mar 04, 2019 7:38 pm

Dumindu wrote:
Sat Mar 02, 2019 3:20 am

Remove the lock-nut and rotate the distributor cup anti-clockwise as much as the nut hole can be seen. Then start rotating the distributor cup Clockwise until engine sound start to increase. Then stop the rotation and rotate it back for few degrees.
Yes, pretty much. But do not remove the bolt holding the distributor position, just back it off until you can just rotate the distributor. you advance the spark timing, tighten the bolt, than drive it and listen for ping. if no ping, advance it again a few degrees, and than drive it again and listen for ping. when you finally hear ping after it is advanced and tested, than back it off a few degrees. an occasional ping is okay, but not too much.
'87 Tercel 4wd SR5 (current engine swap project)
'84 Tercel 4wd (daily driver, with on going mods)
'92 Mazda MPV 4wd (wife's daily driver)
'85 Tercel 4wd DLX auto(daughter's daily driver)
'01 Honda Civic (other daughter's daily driver)

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