Setting Previa Timing - Toyota Nation Forum : Toyota Car and Truck Forums
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#1 Old 05-18-2010, 05:01 PM
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Setting Previa Timing

OK, I did a search for "setting timing" and got everything but. So here is a new thread. I am of the understanding that the stock setting is 5 degrees BTDC. As well I understand that 10 degrees advanced improves overall drivability. 5 degrees increased advance (10 BTDC) doesn't sound like a drastic measure. I would think 8 degrees increased advance (13 BTDC) would be the onset of ping. So, I would like to hear from those who have done their own timing. The process. The tools (is an advance timing light necessary?). Degree of advancement. And the results (MPG, driveability difference, starting difficulity. Yes, I have timed an engine before. Just want this to be searchable so others can benefit from information on one issue being all in one place. TIA guys.

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#2 Old 05-19-2010, 07:59 AM
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I seem to have discovered the "ignition timing adjustment connector". I just don't know where it is. Possibley by the airbox? And it seems that one must short the "E1" and "TE1" pins to disable the electronic timing advance in order to set mechanical timing. Can anyone confirm if I'm on the right track?

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#3 Old 05-19-2010, 08:10 PM
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OK guys, I found the diagnostics connector. Duh. I've only owned this thing for 18 years. I mean I always thought I could not adjust the timing. That it was computer controlled. Oh well, for those with blonde tendancies, the connector is under the drivers seat. I can handle the rest I suppose. Will post back results after I guage the affects.

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#4 Old 09-26-2011, 10:32 PM
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Hey, so how did you end up adjusting the timing?
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#5 Old 09-28-2011, 01:22 PM
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Timing adjustability depends on if it is a Super charged version or not. The S/C version cannot be adjusted. The Non S/C van can be adjusted easily.
I run my 91 previa at 12 deg advanced as opposed to the 5 deg spec-ed. the engine seems much more alive, fuel consumption it a tad better.
here are a couple past threads about this subject ....

Help with 91 previa timing.

Distributor Assembly Difference?

1991 Previa (lexus EGG 240) 5 speed manual trans, spoiler, 18"wheels,tint,
1995 "FrankenYota".S/C, dual roof, 5 speed, 4x4 (2wd,4h,4low) lifted

Last edited by cmh1129; 09-28-2011 at 01:25 PM.
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#6 Old 09-28-2011, 07:18 PM
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Quote:
Originally Posted by cmh1129 View Post
Timing adjustability depends on if it is a Super charged version or not. The S/C version cannot be adjusted. The Non S/C van can be adjusted easily.
I run my 91 previa at 12 deg advanced as opposed to the 5 deg spec-ed. the engine seems much more alive, fuel consumption it a tad better.
here are a couple past threads about this subject ....

Help with 91 previa timing.

Distributor Assembly Difference?


So when you took the cover off and the two toros
Screws, what do you have to turn to set the timing?
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